update yolox

docs/en/dataset_zoo.md

+# Dataset Zoo

docs/en/get_started.md

+# GET STARTED
+
+## Prerequisites
+
+In this section, we demonstrate how to prepare an environment with PyTorch.
+
+MMDetection works on Linux, Windows, and macOS. It requires Python 3.7+, CUDA 9.2+, and PyTorch 1.8+.
+
+```{note}
+If you are experienced with PyTorch and have already installed it, just skip this part and jump to the [next section](#installation). Otherwise, you can follow these steps for the preparation.
+```
+
+**Step 0.** Download and install Miniconda from the [official website](https://docs.conda.io/en/latest/miniconda.html).
+
+**Step 1.** Create a conda environment and activate it.
+
+```shell
+conda create --name openmmlab python=3.8 -y
+conda activate openmmlab
+```
+
+**Step 2.** Install PyTorch following [official instructions](https://pytorch.org/get-started/locally/), e.g.
+
+On GPU platforms:
+
+```shell
+conda install pytorch torchvision -c pytorch
+```
+
+On CPU platforms:
+
+```shell
+conda install pytorch torchvision cpuonly -c pytorch
+```
+
+## Installation
+
+We recommend that users follow our best practices to install MMDetection. However, the whole process is highly customizable. See [Customize Installation](#customize-installation) section for more information.
+
+### Best Practices
+
+**Step 0.** Install [MMEngine](https://github.com/open-mmlab/mmengine) and [MMCV](https://github.com/open-mmlab/mmcv) using [MIM](https://github.com/open-mmlab/mim).
+
+```shell
+pip install -U openmim
+mim install mmengine
+mim install "mmcv>=2.0.0"
+```
+
+**Note:** In MMCV-v2.x, `mmcv-full` is rename to `mmcv`, if you want to install `mmcv` without CUDA ops, you can use `mim install "mmcv-lite>=2.0.0rc1"` to install the lite version.
+
+**Step 1.** Install MMDetection.
+
+Case a: If you develop and run mmdet directly, install it from source:
+
+```shell
+git clone https://github.com/open-mmlab/mmdetection.git
+cd mmdetection
+pip install -v -e .
+# "-v" means verbose, or more output
+# "-e" means installing a project in editable mode,
+# thus any local modifications made to the code will take effect without reinstallation.
+```
+
+Case b: If you use mmdet as a dependency or third-party package, install it with MIM:
+
+```shell
+mim install mmdet
+```
+
+## Verify the installation
+
+To verify whether MMDetection is installed correctly, we provide some sample codes to run an inference demo.
+
+**Step 1.** We need to download config and checkpoint files.
+
+```shell
+mim download mmdet --config rtmdet_tiny_8xb32-300e_coco --dest .
+```
+
+The downloading will take several seconds or more, depending on your network environment. When it is done, you will find two files `rtmdet_tiny_8xb32-300e_coco.py` and `rtmdet_tiny_8xb32-300e_coco_20220902_112414-78e30dcc.pth` in your current folder.
+
+**Step 2.** Verify the inference demo.
+
+Case a: If you install MMDetection from source, just run the following command.
+
+```shell
+python demo/image_demo.py demo/demo.jpg rtmdet_tiny_8xb32-300e_coco.py --weights rtmdet_tiny_8xb32-300e_coco_20220902_112414-78e30dcc.pth --device cpu
+```
+
+You will see a new image `demo.jpg` on your `./outputs/vis` folder, where bounding boxes are plotted on cars, benches, etc.
+
+Case b: If you install MMDetection with MIM, open your python interpreter and copy&paste the following codes.
+
+```python
+from mmdet.apis import init_detector, inference_detector
+
+config_file = 'rtmdet_tiny_8xb32-300e_coco.py'
+checkpoint_file = 'rtmdet_tiny_8xb32-300e_coco_20220902_112414-78e30dcc.pth'
+model = init_detector(config_file, checkpoint_file, device='cpu')  # or device='cuda:0'
+inference_detector(model, 'demo/demo.jpg')
+```
+
+You will see a list of `DetDataSample`, and the predictions are in the `pred_instance`, indicating the detected bounding boxes, labels, and scores.
+
+## Tracking Installation
+
+We recommend that users follow our best practices to install MMDetection for tracking task.
+
+### Best Practices
+
+**Step 0.** Install [MMEngine](https://github.com/open-mmlab/mmengine) and [MMCV](https://github.com/open-mmlab/mmcv) using [MIM](https://github.com/open-mmlab/mim).
+
+```shell
+pip install -U openmim
+mim install mmengine
+mim install "mmcv>=2.0.0"
+```
+
+**Step 1.** Install MMDetection.
+
+Case a: If you develop and run mmdet directly, install it from source:
+
+```shell
+git clone https://github.com/open-mmlab/mmdetection.git
+cd mmdetection
+pip install -v -e . -r requirements/tracking.txt
+# "-v" means verbose, or more output
+# "-e" means installing a project in editable mode,
+# thus any local modifications made to the code will take effect without reinstallation.
+```
+
+Case b: If you use mmdet as a dependency or third-party package, install it with MIM:
+
+```shell
+mim install mmdet[tracking]
+```
+
+**Step 2.** Install TrackEval.
+
+```shell
+pip install git+https://github.com/JonathonLuiten/TrackEval.git
+```
+
+## Verify the installation
+
+To verify whether MMDetection is installed correctly, we provide some sample codes to run an inference demo.
+
+**Step 1.** We need to download config and checkpoint files.
+
+```shell
+mim download mmdet --config bytetrack_yolox_x_8xb4-amp-80e_crowdhuman-mot17halftrain_test-mot17halfval --dest .
+```
+
+The downloading will take several seconds or more, depending on your network environment. When it is done, you will find two files `bytetrack_yolox_x_8xb4-amp-80e_crowdhuman-mot17halftrain_test-mot17halfval.py` and `bytetrack_yolox_x_crowdhuman_mot17-private-half_20211218_205500-1985c9f0.pth` in your current folder.
+
+**Step 2.** Verify the inference demo.
+
+Case a: If you install MMDetection from source, just run the following command.
+
+```shell
+python demo/mot_demo.py demo/demo_mot.mp4 bytetrack_yolox_x_8xb4-amp-80e_crowdhuman-mot17halftrain_test-mot17halfval.py --checkpoint bytetrack_yolox_x_crowdhuman_mot17-private-half_20211218_205500-1985c9f0.pth --out mot.mp4
+```
+
+You will see a new video `mot.mp4` on your folder, where bounding boxes are plotted on person.
+
+Case b: If you install MMDetection with MIM, open your python interpreter and demo/mot_demo.py, then run it like Case a.
+
+### Customize Installation
+
+#### CUDA versions
+
+When installing PyTorch, you need to specify the version of CUDA. If you are not clear on which to choose, follow our recommendations:
+
+- For Ampere-based NVIDIA GPUs, such as GeForce 30 series and NVIDIA A100, CUDA 11 is a must.
+- For older NVIDIA GPUs, CUDA 11 is backward compatible, but CUDA 10.2 offers better compatibility and is more lightweight.
+
+Please make sure the GPU driver satisfies the minimum version requirements. See [this table](https://docs.nvidia.com/cuda/cuda-toolkit-release-notes/index.html#cuda-major-component-versions__table-cuda-toolkit-driver-versions) for more information.
+
+```{note}
+Installing CUDA runtime libraries is enough if you follow our best practices, because no CUDA code will be compiled locally. However, if you hope to compile MMCV from source or develop other CUDA operators, you need to install the complete CUDA toolkit from NVIDIA's [website](https://developer.nvidia.com/cuda-downloads), and its version should match the CUDA version of PyTorch. i.e., the specified version of cudatoolkit in the `conda install` command.
+```
+
+#### Install MMEngine without MIM
+
+To install MMEngine with pip instead of MIM, please follow [MMEngine installation guides](https://mmengine.readthedocs.io/en/latest/get_started/installation.html).
+
+For example, you can install MMEngine by the following command.
+
+```shell
+pip install mmengine
+```
+
+#### Install MMCV without MIM
+
+MMCV contains C++ and CUDA extensions, thus depending on PyTorch in a complex way. MIM solves such dependencies automatically and makes the installation easier. However, it is not a must.
+
+To install MMCV with pip instead of MIM, please follow [MMCV installation guides](https://mmcv.readthedocs.io/en/2.x/get_started/installation.html). This requires manually specifying a find-url based on the PyTorch version and its CUDA version.
+
+For example, the following command installs MMCV built for PyTorch 1.12.x and CUDA 11.6.
+
+```shell
+pip install "mmcv>=2.0.0" -f https://download.openmmlab.com/mmcv/dist/cu116/torch1.12.0/index.html
+```
+
+#### Install on CPU-only platforms
+
+MMDetection can be built for CPU-only environments. In CPU mode you can train (requires MMCV version >= 2.0.0rc1), test, or infer a model.
+
+However, some functionalities are gone in this mode:
+
+- Deformable Convolution
+- Modulated Deformable Convolution
+- ROI pooling
+- Deformable ROI pooling
+- CARAFE
+- SyncBatchNorm
+- CrissCrossAttention
+- MaskedConv2d
+- Temporal Interlace Shift
+- nms_cuda
+- sigmoid_focal_loss_cuda
+- bbox_overlaps
+
+If you try to train/test/infer a model containing the above ops, an error will be raised.
+The following table lists affected algorithms.
+
+|                        Operator                         |                                          Model                                           |
+| :-----------------------------------------------------: | :--------------------------------------------------------------------------------------: |
+| Deformable Convolution/Modulated Deformable Convolution | DCN, Guided Anchoring, RepPoints, CentripetalNet, VFNet, CascadeRPN, NAS-FCOS, DetectoRS |
+|                      MaskedConv2d                       |                                     Guided Anchoring                                     |
+|                         CARAFE                          |                                          CARAFE                                          |
+|                      SyncBatchNorm                      |                                         ResNeSt                                          |
+
+#### Install on Google Colab
+
+[Google Colab](https://colab.research.google.com/) usually has PyTorch installed,
+thus we only need to install MMEngine, MMCV, and MMDetection with the following commands.
+
+**Step 1.** Install [MMEngine](https://github.com/open-mmlab/mmengine) and [MMCV](https://github.com/open-mmlab/mmcv) using [MIM](https://github.com/open-mmlab/mim).
+
+```shell
+!pip3 install openmim
+!mim install mmengine
+!mim install "mmcv>=2.0.0,<2.1.0"
+```
+
+**Step 2.** Install MMDetection from the source.
+
+```shell
+!git clone https://github.com/open-mmlab/mmdetection.git
+%cd mmdetection
+!pip install -e .
+```
+
+**Step 3.** Verification.
+
+```python
+import mmdet
+print(mmdet.__version__)
+# Example output: 3.0.0, or an another version.
+```
+
+```{note}
+Within Jupyter, the exclamation mark `!` is used to call external executables and `%cd` is a [magic command](https://ipython.readthedocs.io/en/stable/interactive/magics.html#magic-cd) to change the current working directory of Python.
+```
+
+#### Use MMDetection with Docker
+
+We provide a [Dockerfile](../../docker/Dockerfile) to build an image. Ensure that your [docker version](https://docs.docker.com/engine/install/) >=19.03.
+
+```shell
+# build an image with PyTorch 1.9, CUDA 11.1
+# If you prefer other versions, just modified the Dockerfile
+docker build -t mmdetection docker/
+```
+
+Run it with
+
+```shell
+docker run --gpus all --shm-size=8g -it -v {DATA_DIR}:/mmdetection/data mmdetection
+```
+
+### Troubleshooting
+
+If you have some issues during the installation, please first view the [FAQ](notes/faq.md) page.
+You may [open an issue](https://github.com/open-mmlab/mmdetection/issues/new/choose) on GitHub if no solution is found.
+
+### Use Multiple Versions of MMDetection in Development
+
+Training and testing scripts have already been modified in `PYTHONPATH` in order to make sure the scripts are using their own versions of MMDetection.
+
+To install the default version of MMDetection in your environment, you can exclude the follow code in the relative scripts:
+
+```shell
+PYTHONPATH="$(dirname $0)/..":$PYTHONPATH
+```

docs/en/index.rst

+Welcome to MMDetection's documentation!
+=======================================
+
+.. toctree::
+   :maxdepth: 1
+   :caption: Get Started
+
+   overview.md
+   get_started.md
+
+.. toctree::
+   :maxdepth: 2
+   :caption: User Guides
+
+   user_guides/index.rst
+
+.. toctree::
+   :maxdepth: 2
+   :caption: Advanced Guides
+
+   advanced_guides/index.rst
+
+.. toctree::
+   :maxdepth: 1
+   :caption: Migration
+
+   migration/migration.md
+
+.. toctree::
+   :maxdepth: 1
+   :caption: API Reference
+
+   api.rst
+
+.. toctree::
+   :maxdepth: 1
+   :caption: Model Zoo
+
+   model_zoo.md
+
+.. toctree::
+   :maxdepth: 1
+   :caption: Notes
+
+   notes/contribution_guide.md
+   notes/projects.md
+   notes/changelog.md
+   notes/changelog_v2.x.md
+   notes/faq.md
+   notes/compatibility.md
+
+.. toctree::
+   :caption: Switch Language
+
+   switch_language.md
+
+
+
+Indices and tables
+==================
+
+* :ref:`genindex`
+* :ref:`search`

docs/en/make.bat

+@ECHO OFF
+
+pushd %~dp0
+
+REM Command file for Sphinx documentation
+
+if "%SPHINXBUILD%" == "" (
+	set SPHINXBUILD=sphinx-build
+)
+set SOURCEDIR=.
+set BUILDDIR=_build
+
+if "%1" == "" goto help
+
+%SPHINXBUILD% >NUL 2>NUL
+if errorlevel 9009 (
+	echo.
+	echo.The 'sphinx-build' command was not found. Make sure you have Sphinx
+	echo.installed, then set the SPHINXBUILD environment variable to point
+	echo.to the full path of the 'sphinx-build' executable. Alternatively you
+	echo.may add the Sphinx directory to PATH.
+	echo.
+	echo.If you don't have Sphinx installed, grab it from
+	echo.http://sphinx-doc.org/
+	exit /b 1
+)
+
+%SPHINXBUILD% -M %1 %SOURCEDIR% %BUILDDIR% %SPHINXOPTS% %O%
+goto end
+
+:help
+%SPHINXBUILD% -M help %SOURCEDIR% %BUILDDIR% %SPHINXOPTS% %O%
+
+:end
+popd

docs/en/migration.md

+# Migration

docs/en/migration/api_and_registry_migration.md

+# Migrate API and Registry from MMDetection 2.x to 3.x

docs/en/migration/config_migration.md

+# Migrate Configuration File from MMDetection 2.x to 3.x
+
+The configuration file of MMDetection 3.x has undergone significant changes in comparison to the 2.x version. This document explains how to migrate 2.x configuration files to 3.x.
+
+In the previous tutorial [Learn about Configs](../user_guides/config.md), we used Mask R-CNN as an example to introduce the configuration file structure of MMDetection 3.x. Here, we will follow the same structure to demonstrate how to migrate 2.x configuration files to 3.x.
+
+## Model Configuration
+
+There have been no major changes to the model configuration in 3.x compared to 2.x. For the model's backbone, neck, head, as well as train_cfg and test_cfg, the parameters remain the same as in version 2.x.
+
+On the other hand, we have added the `DataPreprocessor` module in MMDetection 3.x. The configuration for the `DataPreprocessor` module is located in `model.data_preprocessor`. It is used to preprocess the input data, such as normalizing input images and padding images of different sizes into batches, and loading images from memory to VRAM. This configuration replaces the `Normalize` and `Pad` modules in `train_pipeline` and `test_pipeline` of the earlier version.
+
+<table class="docutils">
+<tr>
+<td>2.x Config</td>
+<td>
+
+```python
+# Image normalization parameters
+img_norm_cfg = dict(
+    mean=[123.675, 116.28, 103.53],
+    std=[58.395, 57.12, 57.375],
+    to_rgb=True)
+pipeline=[
+    ...,
+    dict(type='Normalize', **img_norm_cfg),
+    dict(type='Pad', size_divisor=32),  # Padding the image to multiples of 32
+    ...
+]
+```
+
+</td>
+<tr>
+<td>3.x Config</td>
+<td>
+
+```python
+model = dict(
+    data_preprocessor=dict(
+        type='DetDataPreprocessor',
+        # Image normalization parameters
+        mean=[123.675, 116.28, 103.53],
+        std=[58.395, 57.12, 57.375],
+        bgr_to_rgb=True,
+        # Image padding parameters
+        pad_mask=True,  # In instance segmentation, the mask needs to be padded
+        pad_size_divisor=32)  # Padding the image to multiples of 32
+)
+
+```
+
+</td>
+</tr>
+</table>
+
+## Dataset and Evaluator Configuration
+
+The dataset and evaluator configurations have undergone major changes compared to version 2.x. We will introduce how to migrate from version 2.x to version 3.x from three aspects: Dataloader and Dataset, Data transform pipeline, and Evaluator configuration.
+
+### Dataloader and Dataset Configuration
+
+In the new version, we set the data loading settings consistent with PyTorch's official DataLoader,
+making it easier for users to understand and get started with.
+We put the data loading settings for training, validation, and testing separately in `train_dataloader`, `val_dataloader`, and `test_dataloader`.
+Users can set different parameters for these dataloaders.
+The input parameters are basically the same as those required by [PyTorch DataLoader](https://pytorch.org/docs/stable/data.html?highlight=dataloader#torch.utils.data.DataLoader).
+
+This way, we put the unconfigurable parameters in version 2.x, such as `sampler`, `batch_sampler`, and `persistent_workers`, in the configuration file, so that users can set dataloader parameters more flexibly.
+
+Users can set the dataset configuration through `train_dataloader.dataset`, `val_dataloader.dataset`, and `test_dataloader.dataset`, which correspond to `data.train`, `data.val`, and `data.test` in version 2.x.
+
+<table class="docutils">
+<tr>
+<td>2.x Config</td>
+<td>
+
+```python
+data = dict(
+    samples_per_gpu=2,
+    workers_per_gpu=2,
+    train=dict(
+        type=dataset_type,
+        ann_file=data_root + 'annotations/instances_train2017.json',
+        img_prefix=data_root + 'train2017/',
+        pipeline=train_pipeline),
+    val=dict(
+        type=dataset_type,
+        ann_file=data_root + 'annotations/instances_val2017.json',
+        img_prefix=data_root + 'val2017/',
+        pipeline=test_pipeline),
+    test=dict(
+        type=dataset_type,
+        ann_file=data_root + 'annotations/instances_val2017.json',
+        img_prefix=data_root + 'val2017/',
+        pipeline=test_pipeline))
+```
+
+</td>
+<tr>
+<td>3.x Config</td>
+<td>
+
+```python
+train_dataloader = dict(
+    batch_size=2,
+    num_workers=2,
+    persistent_workers=True,  # Avoid recreating subprocesses after each iteration
+    sampler=dict(type='DefaultSampler', shuffle=True),  # Default sampler, supports both distributed and non-distributed training
+    batch_sampler=dict(type='AspectRatioBatchSampler'),  # Default batch_sampler, used to ensure that images in the batch have similar aspect ratios, so as to better utilize graphics memory
+    dataset=dict(
+        type=dataset_type,
+        data_root=data_root,
+        ann_file='annotations/instances_train2017.json',
+        data_prefix=dict(img='train2017/'),
+        filter_cfg=dict(filter_empty_gt=True, min_size=32),
+        pipeline=train_pipeline))
+# In version 3.x, validation and test dataloaders can be configured independently
+val_dataloader = dict(
+    batch_size=1,
+    num_workers=2,
+    persistent_workers=True,
+    drop_last=False,
+    sampler=dict(type='DefaultSampler', shuffle=False),
+    dataset=dict(
+        type=dataset_type,
+        data_root=data_root,
+        ann_file='annotations/instances_val2017.json',
+        data_prefix=dict(img='val2017/'),
+        test_mode=True,
+        pipeline=test_pipeline))
+test_dataloader = val_dataloader  # The configuration of the testing dataloader is the same as that of the validation dataloader, which is omitted here
+
+```
+
+</td>
+</tr>
+</table>
+
+### Data Transform Pipeline Configuration
+
+As mentioned earlier, we have separated the normalization and padding configurations for images from the `train_pipeline` and `test_pipeline`, and have placed them in `model.data_preprocessor` instead. Hence, in the 3.x version of the pipeline, we no longer require the `Normalize` and `Pad` transforms.
+
+At the same time, we have also refactored the transform responsible for packing the data format, and have merged the `Collect` and `DefaultFormatBundle` transforms into `PackDetInputs`. This transform is responsible for packing the data from the data pipeline into the input format of the model. For more details on the input format conversion, please refer to the [data flow documentation](../advanced_guides/data_flow.md).
+
+Below, we will use the `train_pipeline` of Mask R-CNN as an example, to demonstrate how to migrate from the 2.x configuration to the 3.x configuration:
+
+<table class="docutils">
+<tr>
+<td>2.x Config</td>
+<td>
+
+```python
+img_norm_cfg = dict(
+    mean=[123.675, 116.28, 103.53], std=[58.395, 57.12, 57.375], to_rgb=True)
+train_pipeline = [
+    dict(type='LoadImageFromFile'),
+    dict(type='LoadAnnotations', with_bbox=True),
+    dict(type='Resize', img_scale=(1333, 800), keep_ratio=True),
+    dict(type='RandomFlip', flip_ratio=0.5),
+    dict(type='Normalize', **img_norm_cfg),
+    dict(type='Pad', size_divisor=32),
+    dict(type='DefaultFormatBundle'),
+    dict(type='Collect', keys=['img', 'gt_bboxes', 'gt_labels']),
+]
+```
+
+</td>
+<tr>
+<td>3.x Config</td>
+<td>
+
+```python
+train_pipeline = [
+    dict(type='LoadImageFromFile'),
+    dict(type='LoadAnnotations', with_bbox=True),
+    dict(type='Resize', scale=(1333, 800), keep_ratio=True),
+    dict(type='RandomFlip', prob=0.5),
+    dict(type='PackDetInputs')
+]
+```
+
+</td>
+</tr>
+</table>
+
+For the `test_pipeline`, apart from removing the `Normalize` and `Pad` transforms, we have also separated the data augmentation for testing (TTA) from the normal testing process, and have removed `MultiScaleFlipAug`. For more information on how to use the new TTA version, please refer to the [TTA documentation](../advanced_guides/tta.md).
+
+Below, we will again use the `test_pipeline` of Mask R-CNN as an example, to demonstrate how to migrate from the 2.x configuration to the 3.x configuration:
+
+<table class="docutils">
+<tr>
+<td>2.x Config</td>
+<td>
+
+```python
+test_pipeline = [
+    dict(type='LoadImageFromFile'),
+    dict(
+        type='MultiScaleFlipAug',
+        img_scale=(1333, 800),
+        flip=False,
+        transforms=[
+            dict(type='Resize', keep_ratio=True),
+            dict(type='RandomFlip'),
+            dict(type='Normalize', **img_norm_cfg),
+            dict(type='Pad', size_divisor=32),
+            dict(type='ImageToTensor', keys=['img']),
+            dict(type='Collect', keys=['img']),
+        ])
+]
+```
+
+</td>
+<tr>
+<td>3.x Config</td>
+<td>
+
+```python
+test_pipeline = [
+    dict(type='LoadImageFromFile'),
+    dict(type='Resize', scale=(1333, 800), keep_ratio=True),
+    dict(
+        type='PackDetInputs',
+        meta_keys=('img_id', 'img_path', 'ori_shape', 'img_shape',
+                   'scale_factor'))
+]
+```
+
+</td>
+</tr>
+</table>
+
+In addition, we have also refactored some data augmentation transforms. The following table lists the mapping between the transforms used in the 2.x version and the 3.x version:
+
+<table class="docutils">
+<thead>
+  <tr>
+    <th>Name</th>
+    <th>2.x Config</th>
+    <th>3.x Config</th>
+  </tr>
+</thead>
+<tbody>
+  <tr>
+    <td>Resize</td>
+<td>
+
+```python
+dict(type='Resize',
+     img_scale=(1333, 800),
+     keep_ratio=True)
+```
+
+</td>
+
+<td>
+
+```python
+dict(type='Resize',
+     scale=(1333, 800),
+     keep_ratio=True)
+```
+
+</td>
+  </tr>
+  <tr>
+    <td>RandomResize</td>
+<td>
+
+```python
+dict(
+    type='Resize',
+    img_scale=[
+        (1333, 640), (1333, 800)],
+    multiscale_mode='range',
+    keep_ratio=True)
+```
+
+</td>
+<td>
+
+```python
+dict(
+    type='RandomResize',
+    scale=[
+        (1333, 640), (1333, 800)],
+    keep_ratio=True)
+```
+
+</td>
+  </tr>
+  <tr>
+    <td>RandomChoiceResize</td>
+<td>
+
+```python
+dict(
+    type='Resize',
+    img_scale=[
+        (1333, 640), (1333, 672),
+        (1333, 704), (1333, 736),
+        (1333, 768), (1333, 800)],
+    multiscale_mode='value',
+    keep_ratio=True)
+```
+
+</td>
+<td>
+
+```python
+dict(
+    type='RandomChoiceResize',
+    scales=[
+        (1333, 640), (1333, 672),
+        (1333, 704), (1333, 736),
+        (1333, 768), (1333, 800)],
+    keep_ratio=True)
+```
+
+</td>
+  </tr>
+
+<tr>
+    <td>RandomFlip</td>
+<td>
+
+```python
+dict(type='RandomFlip', flip_ratio=0.5)
+```
+
+</td>
+<td>
+
+```python
+dict(type='RandomFlip', prob=0.5)
+```
+
+</td>
+  </tr>
+
+</tbody>
+</table>
+
+### 评测器配置
+
+In version 3.x, model accuracy evaluation is no longer tied to the dataset, but is instead accomplished through the use of an Evaluator.
+The Evaluator configuration is divided into two parts: `val_evaluator` and `test_evaluator`. The `val_evaluator` is used for validation dataset evaluation, while the `test_evaluator` is used for testing dataset evaluation.
+This corresponds to the `evaluation` field in version 2.x.
+
+The following table shows the corresponding relationship between Evaluators in version 2.x and 3.x.
+
+<table class="docutils">
+<thead>
+  <tr>
+    <th>Metric Name</th>
+    <th>2.x Config</th>
+    <th>3.x Config</th>
+  </tr>
+</thead>
+<tbody>
+  <tr>
+    <td>COCO</td>
+<td>
+
+```python
+data = dict(
+    val=dict(
+        type='CocoDataset',
+        ann_file=data_root + 'annotations/instances_val2017.json'))
+evaluation = dict(metric=['bbox', 'segm'])
+```
+
+</td>
+
+<td>
+
+```python
+val_evaluator = dict(
+    type='CocoMetric',
+    ann_file=data_root + 'annotations/instances_val2017.json',
+    metric=['bbox', 'segm'],
+    format_only=False)
+```
+
+</td>
+  </tr>
+  <tr>
+    <td>Pascal VOC</td>
+<td>
+
+```python
+data = dict(
+    val=dict(
+        type=dataset_type,
+        ann_file=data_root + 'VOC2007/ImageSets/Main/test.txt'))
+evaluation = dict(metric='mAP')
+```
+
+</td>
+<td>
+
+```python
+val_evaluator = dict(
+    type='VOCMetric',
+    metric='mAP',
+    eval_mode='11points')
+```
+
+</td>
+  </tr>
+  <tr>
+    <td>OpenImages</td>
+<td>
+
+```python
+data = dict(
+    val=dict(
+        type='OpenImagesDataset',
+        ann_file=data_root + 'annotations/validation-annotations-bbox.csv',
+        img_prefix=data_root + 'OpenImages/validation/',
+        label_file=data_root + 'annotations/class-descriptions-boxable.csv',
+        hierarchy_file=data_root +
+        'annotations/bbox_labels_600_hierarchy.json',
+        meta_file=data_root + 'annotations/validation-image-metas.pkl',
+        image_level_ann_file=data_root +
+        'annotations/validation-annotations-human-imagelabels-boxable.csv'))
+evaluation = dict(interval=1, metric='mAP')
+```
+
+</td>
+<td>
+
+```python
+val_evaluator = dict(
+    type='OpenImagesMetric',
+    iou_thrs=0.5,
+    ioa_thrs=0.5,
+    use_group_of=True,
+    get_supercategory=True)
+```
+
+</td>
+  </tr>
+
+<tr>
+    <td>CityScapes</td>
+<td>
+
+```python
+data = dict(
+    val=dict(
+        type='CityScapesDataset',
+        ann_file=data_root +
+        'annotations/instancesonly_filtered_gtFine_val.json',
+        img_prefix=data_root + 'leftImg8bit/val/',
+        pipeline=test_pipeline))
+evaluation = dict(metric=['bbox', 'segm'])
+```
+
+</td>
+<td>
+
+```python
+val_evaluator = [
+    dict(
+        type='CocoMetric',
+        ann_file=data_root +
+        'annotations/instancesonly_filtered_gtFine_val.json',
+        metric=['bbox', 'segm']),
+    dict(
+        type='CityScapesMetric',
+        ann_file=data_root +
+        'annotations/instancesonly_filtered_gtFine_val.json',
+        seg_prefix=data_root + '/gtFine/val',
+        outfile_prefix='./work_dirs/cityscapes_metric/instance')
+]
+```
+
+</td>
+  </tr>
+
+</tbody>
+</table>
+
+## Configuration for Training and Testing
+
+<table class="docutils">
+<tr>
+<td>2.x Config</td>
+<td>
+
+```python
+runner = dict(
+    type='EpochBasedRunner',  # Type of training loop
+    max_epochs=12)  # Maximum number of training epochs
+evaluation = dict(interval=2)  # Interval for evaluation, check the performance every 2 epochs
+```
+
+</td>
+<tr>
+<td>3.x Config</td>
+<td>
+
+```python
+train_cfg = dict(
+    type='EpochBasedTrainLoop',  # Type of training loop, please refer to https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/loops.py
+    max_epochs=12,  # Maximum number of training epochs
+    val_interval=2)  # Interval for validation, check the performance every 2 epochs
+val_cfg = dict(type='ValLoop')  # Type of validation loop
+test_cfg = dict(type='TestLoop')  # Type of testing loop
+```
+
+</td>
+</tr>
+</table>
+
+## Optimization Configuration
+
+The configuration for optimizer and gradient clipping is moved to the `optim_wrapper` field.
+The following table shows the correspondences for optimizer configuration between 2.x version and 3.x version:
+
+<table class="docutils">
+<tr>
+<td>2.x Config</td>
+<td>
+
+```python
+optimizer = dict(
+    type='SGD',  # Optimizer: Stochastic Gradient Descent
+    lr=0.02,  # Base learning rate
+    momentum=0.9,  # SGD with momentum
+    weight_decay=0.0001)  # Weight decay
+optimizer_config = dict(grad_clip=None)  # Configuration for gradient clipping, set to None to disable
+```
+
+</td>
+<tr>
+<td>3.x Config</td>
+<td>
+
+```python
+optim_wrapper = dict(  # Configuration for the optimizer wrapper
+    type='OptimWrapper',  # Type of optimizer wrapper, you can switch to AmpOptimWrapper to enable mixed precision training
+    optimizer=dict(  # Optimizer configuration, supports various PyTorch optimizers, please refer to https://pytorch.org/docs/stable/optim.html#algorithms
+        type='SGD',  # SGD
+        lr=0.02,  # Base learning rate
+        momentum=0.9,  # SGD with momentum
+        weight_decay=0.0001),  # Weight decay
+    clip_grad=None,  # Configuration for gradient clipping, set to None to disable. For usage, please see https://mmengine.readthedocs.io/en/latest/tutorials/optimizer.html
+    )
+```
+
+</td>
+</tr>
+</table>
+
+The configuration for learning rate is also moved from the `lr_config` field to the `param_scheduler` field. The `param_scheduler` configuration is more similar to PyTorch's learning rate scheduler and more flexible. The following table shows the correspondences for learning rate configuration between 2.x version and 3.x version:
+
+<table class="docutils">
+<tr>
+<td>2.x Config</td>
+<td>
+
+```python
+lr_config = dict(
+    policy='step',  # Use multi-step learning rate strategy during training
+    warmup='linear',  # Use linear learning rate warmup
+    warmup_iters=500,  # End warmup at iteration 500
+    warmup_ratio=0.001,  # Coefficient for learning rate warmup
+    step=[8, 11],  # Learning rate decay at which epochs
+    gamma=0.1)  # Learning rate decay coefficient
+
+```
+
+</td>
+<tr>
+<td>3.x Config</td>
+<td>
+
+```python
+param_scheduler = [
+    dict(
+        type='LinearLR',  # Use linear learning rate warmup
+        start_factor=0.001, # Coefficient for learning rate warmup
+        by_epoch=False,  # Update the learning rate during warmup at each iteration
+        begin=0,  # Starting from the first iteration
+        end=500),  # End at the 500th iteration
+    dict(
+        type='MultiStepLR',  # Use multi-step learning rate strategy during training
+        by_epoch=True,  # Update the learning rate at each epoch
+        begin=0,   # Starting from the first epoch
+        end=12,  # Ending at the 12th epoch
+        milestones=[8, 11],  # Learning rate decay at which epochs
+        gamma=0.1)  # Learning rate decay coefficient
+]
+
+```
+
+</td>
+</tr>
+</table>
+
+For information on how to migrate other learning rate adjustment policies, please refer to the [learning rate migration document of MMEngine](https://mmengine.readthedocs.io/zh_CN/latest/migration/param_scheduler.html).
+
+## Migration of Other Configurations
+
+### Configuration for Saving Checkpoints
+
+<table class="docutils">
+<thead>
+  <tr>
+    <th>Function</th>
+    <th>2.x Config</th>
+    <th>3.x Config</th>
+  </tr>
+</thead>
+<tbody>
+  <tr>
+    <td>Set Save Interval</td>
+<td>
+
+```python
+checkpoint_config = dict(
+    interval=1)
+```
+
+</td>
+
+<td>
+
+```python
+default_hooks = dict(
+    checkpoint=dict(
+        type='CheckpointHook',
+        interval=1))
+```
+
+</td>
+  </tr>
+
+<tr>
+    <td>Save Best Model</td>
+<td>
+
+```python
+evaluation = dict(
+    save_best='auto')
+```
+
+</td>
+<td>
+
+```python
+default_hooks = dict(
+    checkpoint=dict(
+        type='CheckpointHook',
+        save_best='auto'))
+```
+
+</td>
+  </tr>
+
+<tr>
+    <td>Keep Latest Model</td>
+<td>
+
+```python
+checkpoint_config = dict(
+    max_keep_ckpts=3)
+```
+
+</td>
+<td>
+
+```python
+default_hooks = dict(
+    checkpoint=dict(
+        type='CheckpointHook',
+        max_keep_ckpts=3))
+```
+
+</td>
+  </tr>
+
+</tbody>
+</table>
+
+### Logging Configuration
+
+In MMDetection 3.x, the logging and visualization of the log are carried out respectively by the logger and visualizer in MMEngine. The following table shows the comparison between the configuration of printing logs and visualizing logs in MMDetection 2.x and 3.x.
+
+<table class="docutils">
+<thead>
+  <tr>
+    <th>Function</th>
+    <th>2.x Config</th>
+    <th>3.x Config</th>
+  </tr>
+</thead>
+<tbody>
+  <tr>
+    <td>Set Log Printing Interval</td>
+<td>
+
+```python
+log_config = dict(interval=50)
+```
+
+</td>
+
+<td>
+
+```python
+default_hooks = dict(
+    logger=dict(type='LoggerHook', interval=50))
+# Optional: set moving average window size
+log_processor = dict(
+    type='LogProcessor', window_size=50)
+```
+
+</td>
+  </tr>
+
+<tr>
+    <td>Use TensorBoard or WandB to visualize logs</td>
+<td>
+
+```python
+log_config = dict(
+    interval=50,
+    hooks=[
+        dict(type='TextLoggerHook'),
+        dict(type='TensorboardLoggerHook'),
+        dict(type='MMDetWandbHook',
+             init_kwargs={
+                'project': 'mmdetection',
+                'group': 'maskrcnn-r50-fpn-1x-coco'
+             },
+             interval=50,
+             log_checkpoint=True,
+             log_checkpoint_metadata=True,
+             num_eval_images=100)
+    ])
+```
+
+</td>
+<td>
+
+```python
+vis_backends = [
+    dict(type='LocalVisBackend'),
+    dict(type='TensorboardVisBackend'),
+    dict(type='WandbVisBackend',
+         init_kwargs={
+            'project': 'mmdetection',
+            'group': 'maskrcnn-r50-fpn-1x-coco'
+         })
+]
+visualizer = dict(
+    type='DetLocalVisualizer',
+    vis_backends=vis_backends,
+    name='visualizer')
+```
+
+</td>
+  </tr>
+
+</tbody>
+</table>
+
+For visualization-related tutorials, please refer to [Visualization Tutorial](../user_guides/visualization.md) of MMDetection.
+
+### Runtime Configuration
+
+The runtime configuration fields in version 3.x have been adjusted, and the specific correspondence is as follows:
+
+<table class="docutils">
+<thead>
+  <tr>
+    <th>2.x Config</th>
+    <th>3.x Config</th>
+  </tr>
+</thead>
+<tbody>
+
+<tr>
+<td>
+
+```python
+cudnn_benchmark = False
+opencv_num_threads = 0
+mp_start_method = 'fork'
+dist_params = dict(backend='nccl')
+log_level = 'INFO'
+load_from = None
+resume_from = None
+
+
+```
+
+</td>
+<td>
+
+```python
+env_cfg = dict(
+    cudnn_benchmark=False,
+    mp_cfg=dict(mp_start_method='fork',
+                opencv_num_threads=0),
+    dist_cfg=dict(backend='nccl'))
+log_level = 'INFO'
+load_from = None
+resume = False
+```
+
+</td>
+  </tr>
+
+</tbody>
+</table>

docs/en/migration/dataset_migration.md

+# Migrate dataset from MMDetection 2.x to 3.x

docs/en/migration/migration.md

+# Migrating from MMDetection 2.x to 3.x
+
+MMDetection 3.x is a significant update that includes many changes to API and configuration files. This document aims to help users migrate from MMDetection 2.x to 3.x.
+We divided the migration guide into the following sections:
+
+- [Configuration file migration](./config_migration.md)
+- [API and Registry migration](./api_and_registry_migration.md)
+- [Dataset migration](./dataset_migration.md)
+- [Model migration](./model_migration.md)
+- [Frequently Asked Questions](./migration_faq.md)
+
+If you encounter any problems during the migration process, feel free to raise an issue. We also welcome contributions to this document.

docs/en/migration/migration_faq.md

+# Migration FAQ

docs/en/migration/model_migration.md

+# Migrate models from MMDetection 2.x to 3.x

docs/en/model_zoo.md

+# Benchmark and Model Zoo
+
+## Mirror sites
+
+We only use aliyun to maintain the model zoo since MMDetection V2.0. The model zoo of V1.x has been deprecated.
+
+## Common settings
+
+- All models were trained on `coco_2017_train`, and tested on the `coco_2017_val`.
+- We use distributed training.
+- All pytorch-style pretrained backbones on ImageNet are from PyTorch model zoo, caffe-style pretrained backbones are converted from the newly released model from detectron2.
+- For fair comparison with other codebases, we report the GPU memory as the maximum value of `torch.cuda.max_memory_allocated()` for all 8 GPUs. Note that this value is usually less than what `nvidia-smi` shows.
+- We report the inference time as the total time of network forwarding and post-processing, excluding the data loading time. Results are obtained with the script [benchmark.py](https://github.com/open-mmlab/mmdetection/blob/main/tools/analysis_tools/benchmark.py) which computes the average time on 2000 images.
+
+## ImageNet Pretrained Models
+
+It is common to initialize from backbone models pre-trained on ImageNet classification task. All pre-trained  model links can be found at [open_mmlab](https://github.com/open-mmlab/mmcv/blob/master/mmcv/model_zoo/open_mmlab.json).  According to `img_norm_cfg` and source of weight, we can divide all the ImageNet  pre-trained  model weights into some cases:
+
+- TorchVision:  Corresponding to torchvision weight, including ResNet50, ResNet101. The `img_norm_cfg` is `dict(mean=[123.675, 116.28, 103.53], std=[58.395, 57.12, 57.375], to_rgb=True)`.
+- Pycls:  Corresponding to [pycls](https://github.com/facebookresearch/pycls) weight, including RegNetX. The `img_norm_cfg` is `dict(   mean=[103.530, 116.280, 123.675], std=[57.375, 57.12, 58.395], to_rgb=False)`.
+- MSRA styles: Corresponding to [MSRA](https://github.com/KaimingHe/deep-residual-networks) weights, including ResNet50_Caffe and ResNet101_Caffe. The `img_norm_cfg` is `dict(   mean=[103.530, 116.280, 123.675], std=[1.0, 1.0, 1.0], to_rgb=False)`.
+- Caffe2 styles:  Currently only contains ResNext101_32x8d. The `img_norm_cfg` is `dict(mean=[103.530, 116.280, 123.675], std=[57.375, 57.120, 58.395], to_rgb=False)`.
+- Other styles: E.g SSD which corresponds to `img_norm_cfg` is `dict(mean=[123.675, 116.28, 103.53], std=[1, 1, 1], to_rgb=True)` and YOLOv3 which corresponds to `img_norm_cfg` is `dict(mean=[0, 0, 0], std=[255., 255., 255.], to_rgb=True)`.
+
+The detailed table of the commonly used backbone models in MMDetection is listed below :
+
+| model            | source      | link                                                                                                                                                                                                   | description                                                                                                                                                                                                                                      |
+| ---------------- | ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
+| ResNet50         | TorchVision | [torchvision's ResNet-50](https://download.pytorch.org/models/resnet50-19c8e357.pth)                                                                                                                   | From [torchvision's ResNet-50](https://download.pytorch.org/models/resnet50-19c8e357.pth).                                                                                                                                                       |
+| ResNet101        | TorchVision | [torchvision's ResNet-101](https://download.pytorch.org/models/resnet101-5d3b4d8f.pth)                                                                                                                 | From [torchvision's ResNet-101](https://download.pytorch.org/models/resnet101-5d3b4d8f.pth).                                                                                                                                                     |
+| RegNetX          | Pycls       | [RegNetX_3.2gf](https://download.openmmlab.com/pretrain/third_party/regnetx_3.2gf-c2599b0f.pth), [RegNetX_800mf](https://download.openmmlab.com/pretrain/third_party/regnetx_800mf-1f4be4c7.pth). etc. | From [pycls](https://github.com/facebookresearch/pycls).                                                                                                                                                                                         |
+| ResNet50_Caffe   | MSRA        | [MSRA's ResNet-50](https://download.openmmlab.com/pretrain/third_party/resnet50_caffe-788b5fa3.pth)                                                                                                    | Converted copy of [Detectron2's R-50.pkl](https://dl.fbaipublicfiles.com/detectron2/ImageNetPretrained/MSRA/R-50.pkl) model. The original weight comes from [MSRA's original ResNet-50](https://github.com/KaimingHe/deep-residual-networks).    |
+| ResNet101_Caffe  | MSRA        | [MSRA's ResNet-101](https://download.openmmlab.com/pretrain/third_party/resnet101_caffe-3ad79236.pth)                                                                                                  | Converted copy of [Detectron2's R-101.pkl](https://dl.fbaipublicfiles.com/detectron2/ImageNetPretrained/MSRA/R-101.pkl) model. The original weight comes from [MSRA's original ResNet-101](https://github.com/KaimingHe/deep-residual-networks). |
+| ResNext101_32x8d | Caffe2      | [Caffe2 ResNext101_32x8d](https://download.openmmlab.com/pretrain/third_party/resnext101_32x8d-1516f1aa.pth)                                                                                           | Converted copy of [Detectron2's X-101-32x8d.pkl](https://dl.fbaipublicfiles.com/detectron2/ImageNetPretrained/FAIR/X-101-32x8d.pkl) model. The ResNeXt-101-32x8d model trained with Caffe2 at FB.                                                |
+
+## Baselines
+
+### RPN
+
+Please refer to [RPN](https://github.com/open-mmlab/mmdetection/blob/main/configs/rpn) for details.
+
+### Faster R-CNN
+
+Please refer to [Faster R-CNN](https://github.com/open-mmlab/mmdetection/blob/main/configs/faster_rcnn) for details.
+
+### Mask R-CNN
+
+Please refer to [Mask R-CNN](https://github.com/open-mmlab/mmdetection/blob/main/configs/mask_rcnn) for details.
+
+### Fast R-CNN (with pre-computed proposals)
+
+Please refer to [Fast R-CNN](https://github.com/open-mmlab/mmdetection/blob/main/configs/fast_rcnn) for details.
+
+### RetinaNet
+
+Please refer to [RetinaNet](https://github.com/open-mmlab/mmdetection/blob/main/configs/retinanet) for details.
+
+### Cascade R-CNN and Cascade Mask R-CNN
+
+Please refer to [Cascade R-CNN](https://github.com/open-mmlab/mmdetection/blob/main/configs/cascade_rcnn) for details.
+
+### Hybrid Task Cascade (HTC)
+
+Please refer to [HTC](https://github.com/open-mmlab/mmdetection/blob/main/configs/htc) for details.
+
+### SSD
+
+Please refer to [SSD](https://github.com/open-mmlab/mmdetection/blob/main/configs/ssd) for details.
+
+### Group Normalization (GN)
+
+Please refer to [Group Normalization](https://github.com/open-mmlab/mmdetection/blob/main/configs/gn) for details.
+
+### Weight Standardization
+
+Please refer to [Weight Standardization](https://github.com/open-mmlab/mmdetection/blob/main/configs/gn+ws) for details.
+
+### Deformable Convolution v2
+
+Please refer to [Deformable Convolutional Networks](https://github.com/open-mmlab/mmdetection/blob/main/configs/dcn) for details.
+
+### CARAFE: Content-Aware ReAssembly of FEatures
+
+Please refer to [CARAFE](https://github.com/open-mmlab/mmdetection/blob/main/configs/carafe) for details.
+
+### Instaboost
+
+Please refer to [Instaboost](https://github.com/open-mmlab/mmdetection/blob/main/configs/instaboost) for details.
+
+### Libra R-CNN
+
+Please refer to [Libra R-CNN](https://github.com/open-mmlab/mmdetection/blob/main/configs/libra_rcnn) for details.
+
+### Guided Anchoring
+
+Please refer to [Guided Anchoring](https://github.com/open-mmlab/mmdetection/blob/main/configs/guided_anchoring) for details.
+
+### FCOS
+
+Please refer to [FCOS](https://github.com/open-mmlab/mmdetection/blob/main/configs/fcos) for details.
+
+### FoveaBox
+
+Please refer to [FoveaBox](https://github.com/open-mmlab/mmdetection/blob/main/configs/foveabox) for details.
+
+### RepPoints
+
+Please refer to [RepPoints](https://github.com/open-mmlab/mmdetection/blob/main/configs/reppoints) for details.
+
+### FreeAnchor
+
+Please refer to [FreeAnchor](https://github.com/open-mmlab/mmdetection/blob/main/configs/free_anchor) for details.
+
+### Grid R-CNN (plus)
+
+Please refer to [Grid R-CNN](https://github.com/open-mmlab/mmdetection/blob/main/configs/grid_rcnn) for details.
+
+### GHM
+
+Please refer to [GHM](https://github.com/open-mmlab/mmdetection/blob/main/configs/ghm) for details.
+
+### GCNet
+
+Please refer to [GCNet](https://github.com/open-mmlab/mmdetection/blob/main/configs/gcnet) for details.
+
+### HRNet
+
+Please refer to [HRNet](https://github.com/open-mmlab/mmdetection/blob/main/configs/hrnet) for details.
+
+### Mask Scoring R-CNN
+
+Please refer to [Mask Scoring R-CNN](https://github.com/open-mmlab/mmdetection/blob/main/configs/ms_rcnn) for details.
+
+### Train from Scratch
+
+Please refer to [Rethinking ImageNet Pre-training](https://github.com/open-mmlab/mmdetection/blob/main/configs/scratch) for details.
+
+### NAS-FPN
+
+Please refer to [NAS-FPN](https://github.com/open-mmlab/mmdetection/blob/main/configs/nas_fpn) for details.
+
+### ATSS
+
+Please refer to [ATSS](https://github.com/open-mmlab/mmdetection/blob/main/configs/atss) for details.
+
+### FSAF
+
+Please refer to [FSAF](https://github.com/open-mmlab/mmdetection/blob/main/configs/fsaf) for details.
+
+### RegNetX
+
+Please refer to [RegNet](https://github.com/open-mmlab/mmdetection/blob/main/configs/regnet) for details.
+
+### Res2Net
+
+Please refer to [Res2Net](https://github.com/open-mmlab/mmdetection/blob/main/configs/res2net) for details.
+
+### GRoIE
+
+Please refer to [GRoIE](https://github.com/open-mmlab/mmdetection/blob/main/configs/groie) for details.
+
+### Dynamic R-CNN
+
+Please refer to [Dynamic R-CNN](https://github.com/open-mmlab/mmdetection/blob/main/configs/dynamic_rcnn) for details.
+
+### PointRend
+
+Please refer to [PointRend](https://github.com/open-mmlab/mmdetection/blob/main/configs/point_rend) for details.
+
+### DetectoRS
+
+Please refer to [DetectoRS](https://github.com/open-mmlab/mmdetection/blob/main/configs/detectors) for details.
+
+### Generalized Focal Loss
+
+Please refer to [Generalized Focal Loss](https://github.com/open-mmlab/mmdetection/blob/main/configs/gfl) for details.
+
+### CornerNet
+
+Please refer to [CornerNet](https://github.com/open-mmlab/mmdetection/blob/main/configs/cornernet) for details.
+
+### YOLOv3
+
+Please refer to [YOLOv3](https://github.com/open-mmlab/mmdetection/blob/main/configs/yolo) for details.
+
+### PAA
+
+Please refer to [PAA](https://github.com/open-mmlab/mmdetection/blob/main/configs/paa) for details.
+
+### SABL
+
+Please refer to [SABL](https://github.com/open-mmlab/mmdetection/blob/main/configs/sabl) for details.
+
+### CentripetalNet
+
+Please refer to [CentripetalNet](https://github.com/open-mmlab/mmdetection/blob/main/configs/centripetalnet) for details.
+
+### ResNeSt
+
+Please refer to [ResNeSt](https://github.com/open-mmlab/mmdetection/blob/main/configs/resnest) for details.
+
+### DETR
+
+Please refer to [DETR](https://github.com/open-mmlab/mmdetection/blob/main/configs/detr) for details.
+
+### Deformable DETR
+
+Please refer to [Deformable DETR](https://github.com/open-mmlab/mmdetection/blob/main/configs/deformable_detr) for details.
+
+### AutoAssign
+
+Please refer to [AutoAssign](https://github.com/open-mmlab/mmdetection/blob/main/configs/autoassign) for details.
+
+### YOLOF
+
+Please refer to [YOLOF](https://github.com/open-mmlab/mmdetection/blob/main/configs/yolof) for details.
+
+### Seesaw Loss
+
+Please refer to [Seesaw Loss](https://github.com/open-mmlab/mmdetection/blob/main/configs/seesaw_loss) for details.
+
+### CenterNet
+
+Please refer to [CenterNet](https://github.com/open-mmlab/mmdetection/blob/main/configs/centernet) for details.
+
+### YOLOX
+
+Please refer to [YOLOX](https://github.com/open-mmlab/mmdetection/blob/main/configs/yolox) for details.
+
+### PVT
+
+Please refer to [PVT](https://github.com/open-mmlab/mmdetection/blob/main/configs/pvt) for details.
+
+### SOLO
+
+Please refer to [SOLO](https://github.com/open-mmlab/mmdetection/blob/main/configs/solo) for details.
+
+### QueryInst
+
+Please refer to [QueryInst](https://github.com/open-mmlab/mmdetection/blob/main/configs/queryinst) for details.
+
+### PanopticFPN
+
+Please refer to [PanopticFPN](https://github.com/open-mmlab/mmdetection/blob/main/configs/panoptic_fpn) for details.
+
+### MaskFormer
+
+Please refer to [MaskFormer](https://github.com/open-mmlab/mmdetection/blob/main/configs/maskformer) for details.
+
+### DyHead
+
+Please refer to [DyHead](https://github.com/open-mmlab/mmdetection/blob/main/configs/dyhead) for details.
+
+### Mask2Former
+
+Please refer to [Mask2Former](https://github.com/open-mmlab/mmdetection/blob/main/configs/mask2former) for details.
+
+### Efficientnet
+
+Please refer to [Efficientnet](https://github.com/open-mmlab/mmdetection/blob/main/configs/efficientnet) for details.
+
+### Other datasets
+
+We also benchmark some methods on [PASCAL VOC](https://github.com/open-mmlab/mmdetection/blob/main/configs/pascal_voc), [Cityscapes](https://github.com/open-mmlab/mmdetection/blob/main/configs/cityscapes), [OpenImages](https://github.com/open-mmlab/mmdetection/blob/main/configs/openimages) and [WIDER FACE](https://github.com/open-mmlab/mmdetection/blob/main/configs/wider_face).
+
+### Pre-trained Models
+
+We also train [Faster R-CNN](https://github.com/open-mmlab/mmdetection/blob/main/configs/faster_rcnn) and [Mask R-CNN](https://github.com/open-mmlab/mmdetection/blob/main/configs/mask_rcnn) using ResNet-50 and [RegNetX-3.2G](https://github.com/open-mmlab/mmdetection/blob/main/configs/regnet) with multi-scale training and longer schedules. These models serve as strong pre-trained models for downstream tasks for convenience.
+
+## Speed benchmark
+
+### Training Speed benchmark
+
+We provide [analyze_logs.py](https://github.com/open-mmlab/mmdetection/blob/main/tools/analysis_tools/analyze_logs.py) to get average time of iteration in training. You can find examples in [Log Analysis](https://mmdetection.readthedocs.io/en/latest/useful_tools.html#log-analysis).
+
+We compare the training speed of Mask R-CNN with some other popular frameworks (The data is copied from [detectron2](https://github.com/facebookresearch/detectron2/blob/main/docs/notes/benchmarks.md/)).
+For mmdetection, we benchmark with [mask-rcnn_r50-caffe_fpn_poly-1x_coco_v1.py](https://github.com/open-mmlab/mmdetection/blob/main/configs/mask_rcnn/mask-rcnn_r50-caffe_fpn_poly-1x_coco_v1.py), which should have the same setting with [mask_rcnn_R_50_FPN_noaug_1x.yaml](https://github.com/facebookresearch/detectron2/blob/main/configs/Detectron1-Comparisons/mask_rcnn_R_50_FPN_noaug_1x.yaml) of detectron2.
+We also provide the [checkpoint](https://download.openmmlab.com/mmdetection/v2.0/benchmark/mask_rcnn_r50_caffe_fpn_poly_1x_coco_no_aug/mask_rcnn_r50_caffe_fpn_poly_1x_coco_no_aug_compare_20200518-10127928.pth) and [training log](https://download.openmmlab.com/mmdetection/v2.0/benchmark/mask_rcnn_r50_caffe_fpn_poly_1x_coco_no_aug/mask_rcnn_r50_caffe_fpn_poly_1x_coco_no_aug_20200518_105755.log.json) for reference. The throughput is computed as the average throughput in iterations 100-500 to skip GPU warmup time.
+
+| Implementation                                                                         | Throughput (img/s) |
+| -------------------------------------------------------------------------------------- | ------------------ |
+| [Detectron2](https://github.com/facebookresearch/detectron2)                           | 62                 |
+| [MMDetection](https://github.com/open-mmlab/mmdetection)                               | 61                 |
+| [maskrcnn-benchmark](https://github.com/facebookresearch/maskrcnn-benchmark/)          | 53                 |
+| [tensorpack](https://github.com/tensorpack/tensorpack/tree/master/examples/FasterRCNN) | 50                 |
+| [simpledet](https://github.com/TuSimple/simpledet/)                                    | 39                 |
+| [Detectron](https://github.com/facebookresearch/Detectron)                             | 19                 |
+| [matterport/Mask_RCNN](https://github.com/matterport/Mask_RCNN/)                       | 14                 |
+
+### Inference Speed Benchmark
+
+We provide [benchmark.py](https://github.com/open-mmlab/mmdetection/blob/main/tools/analysis_tools/benchmark.py) to benchmark the inference latency.
+The script benchmarkes the model with 2000 images and calculates the average time ignoring first 5 times. You can change the output log interval (defaults: 50) by setting `LOG-INTERVAL`.
+
+```shell
+python tools/benchmark.py ${CONFIG} ${CHECKPOINT} [--log-interval $[LOG-INTERVAL]] [--fuse-conv-bn]
+```
+
+The latency of all models in our model zoo is benchmarked without setting `fuse-conv-bn`, you can get a lower latency by setting it.
+
+## Comparison with Detectron2
+
+We compare mmdetection with [Detectron2](https://github.com/facebookresearch/detectron2.git) in terms of speed and performance.
+We use the commit id [185c27e](https://github.com/facebookresearch/detectron2/tree/185c27e4b4d2d4c68b5627b3765420c6d7f5a659)(30/4/2020) of detectron.
+For fair comparison, we install and run both frameworks on the same machine.
+
+### Hardware
+
+- 8 NVIDIA Tesla V100 (32G) GPUs
+- Intel(R) Xeon(R) Gold 6148 CPU @ 2.40GHz
+
+### Software environment
+
+- Python 3.7
+- PyTorch 1.4
+- CUDA 10.1
+- CUDNN 7.6.03
+- NCCL 2.4.08
+
+### Performance
+
+| Type                                                                                                                            | Lr schd | Detectron2                                                                                                                           | mmdetection | Download                                                                                                                                                                                                                                                                                                                                                         |
+| ------------------------------------------------------------------------------------------------------------------------------- | ------- | ------------------------------------------------------------------------------------------------------------------------------------ | ----------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| [Faster R-CNN](https://github.com/open-mmlab/mmdetection/blob/main/configs/faster_rcnn/faster-rcnn_r50-caffe_fpn_ms-1x_coco.py) | 1x      | [37.9](https://github.com/facebookresearch/detectron2/blob/main/configs/COCO-Detection/faster_rcnn_R_50_FPN_1x.yaml)                 | 38.0        | [model](https://download.openmmlab.com/mmdetection/v2.0/benchmark/faster_rcnn_r50_caffe_fpn_mstrain_1x_coco/faster_rcnn_r50_caffe_fpn_mstrain_1x_coco-5324cff8.pth) \| [log](https://download.openmmlab.com/mmdetection/v2.0/benchmark/faster_rcnn_r50_caffe_fpn_mstrain_1x_coco/faster_rcnn_r50_caffe_fpn_mstrain_1x_coco_20200429_234554.log.json)             |
+| [Mask R-CNN](https://github.com/open-mmlab/mmdetection/blob/main/configs/mask_rcnn/mask-rcnn_r50-caffe_fpn_ms-poly-1x_coco.py)  | 1x      | [38.6 & 35.2](https://github.com/facebookresearch/detectron2/blob/main/configs/COCO-InstanceSegmentation/mask_rcnn_R_50_FPN_1x.yaml) | 38.8 & 35.4 | [model](https://download.openmmlab.com/mmdetection/v2.0/benchmark/mask_rcnn_r50_caffe_fpn_mstrain-poly_1x_coco/mask_rcnn_r50_caffe_fpn_mstrain-poly_1x_coco-dbecf295.pth) \| [log](https://download.openmmlab.com/mmdetection/v2.0/benchmark/mask_rcnn_r50_caffe_fpn_mstrain-poly_1x_coco/mask_rcnn_r50_caffe_fpn_mstrain-poly_1x_coco_20200430_054239.log.json) |
+| [Retinanet](https://github.com/open-mmlab/mmdetection/blob/main/configs/retinanet/retinanet_r50-caffe_fpn_ms-1x_coco.py)        | 1x      | [36.5](https://github.com/facebookresearch/detectron2/blob/master/configs/COCO-Detection/retinanet_R_50_FPN_1x.yaml)                 | 37.0        | [model](https://download.openmmlab.com/mmdetection/v2.0/benchmark/retinanet_r50_caffe_fpn_mstrain_1x_coco/retinanet_r50_caffe_fpn_mstrain_1x_coco-586977a0.pth) \| [log](https://download.openmmlab.com/mmdetection/v2.0/benchmark/retinanet_r50_caffe_fpn_mstrain_1x_coco/retinanet_r50_caffe_fpn_mstrain_1x_coco_20200430_014748.log.json)                     |
+
+### Training Speed
+
+The training speed is measure with s/iter. The lower, the better.
+
+| Type         | Detectron2 | mmdetection |
+| ------------ | ---------- | ----------- |
+| Faster R-CNN | 0.210      | 0.216       |
+| Mask R-CNN   | 0.261      | 0.265       |
+| Retinanet    | 0.200      | 0.205       |
+
+### Inference Speed
+
+The inference speed is measured with fps (img/s) on a single GPU, the higher, the better.
+To be consistent with Detectron2, we report the pure inference speed (without the time of data loading).
+For Mask R-CNN, we exclude the time of RLE encoding in post-processing.
+We also include the officially reported speed in the parentheses, which is slightly higher
+than the results tested on our server due to differences of hardwares.
+
+| Type         | Detectron2  | mmdetection |
+| ------------ | ----------- | ----------- |
+| Faster R-CNN | 25.6 (26.3) | 22.2        |
+| Mask R-CNN   | 22.5 (23.3) | 19.6        |
+| Retinanet    | 17.8 (18.2) | 20.6        |
+
+### Training memory
+
+| Type         | Detectron2 | mmdetection |
+| ------------ | ---------- | ----------- |
+| Faster R-CNN | 3.0        | 3.8         |
+| Mask R-CNN   | 3.4        | 3.9         |
+| Retinanet    | 3.9        | 3.4         |

docs/en/notes/changelog.md

+# Changelog of v3.x
+
+## v3.1.0 (12/10/2023)
+
+### Highlights
+
+**(1) Detection Transformer SOTA Model Collection**
+
+- Supported four updated and stronger SOTA Transformer models: DDQ, CO-DETR, AlignDETR, and H-DINO.
+- Based on CO-DETR, MMDet released a model with a COCO performance of 64.1 mAP.
+- Algorithms such as DINO support AMP/Checkpoint/FrozenBN, which can effectively reduce memory usage.
+
+**(2) Comprehensive Performance Comparison between CNN and Transformer**
+
+RF100 consists of a dataset collection of 100 real-world datasets, including 7 domains. It can be used to assess the performance differences of Transformer models like DINO and CNN-based algorithms under different scenarios and data volumes. Users can utilize this benchmark to quickly evaluate the robustness of their algorithms in various scenarios.
+
+**(3) Support for GLIP and Grounding DINO fine-tuning, the only algorithm library that supports Grounding DINO fine-tuning**
+
+The Grounding DINO algorithm in MMDet is the only library that supports fine-tuning. Its performance is one point higher than the official version, and of course, GLIP also outperforms the official version.
+We also provide a detailed process for training and evaluating Grounding DINO on custom datasets. Everyone is welcome to give it a try.
+
+**(4) Support for the open-vocabulary detection algorithm Detic and multi-dataset joint training.**
+
+**(5) Training detection models using FSDP and DeepSpeed.**
+
+**(6) Support for the V3Det dataset, a large-scale detection dataset with over 13,000 categories.**
+
+### New Features
+
+- Support CO-DETR/DDQ/AlignDETR/H-DINO
+- Support GLIP and Grounding DINO fine-tuning
+- Support Detic and Multi-Datasets training (#10926)
+- Support V3Det and benchmark (#10938)
+- Support Roboflow 100 Benchmark (#10915)
+- Add custom dataset of grounding dino (#11012)
+- Release RTMDet-X p6 (#10993)
+- Support AMP of DINO (#10827)
+- Support FrozenBN (#10845)
+- Add new configuration files for `QDTrack/DETR/RTMDet/MaskRCNN/DINO/DeformableDETR/MaskFormer` algorithm
+- Add a new script to support the WBF (#10808)
+- Add `large_image_demo` (#10719)
+- Support download dataset from OpenXLab (#10799)
+- Update to support torch2onnx for DETR series models (#10910)
+- Translation into Chinese of an English document (#10744, #10756, #10805, #10848)
+
+### Bug Fixes
+
+- Fix name error in DETR metafile.yml (#10595)
+- Fix device of the tensors in `set_nms` (#10574)
+- Remove some unicode chars from `en/` docs (#10648)
+- Fix download dataset with mim script. (#10727)
+- Fix export to torchserve (#10694)
+- Fix typo in `mask-rcnn_r50_fpn_1x-wandb_coco` (#10757)
+- Fix `eval_recalls` error in `voc_metric` (#10770)
+- Fix torch version comparison (#10934)
+- Fix incorrect behavior to access train pipeline from ConcatDataset in `analyze_results.py` (#11004)
+
+### Improvements
+
+- Update `useful_tools.md` (#10587)
+- Update Instance segmentation Tutorial (#10711)
+- Update `train.py` to compat with new config (#11025)
+- Support `torch2onnx` for maskformer series (#10782)
+
+### Contributors
+
+A total of 36 developers contributed to this release.
+
+Thank @YQisme, @nskostas, @max-unfinity, @evdcush, @Xiangxu-0103, @ZhaoCake, @RangeKing, @captainIT, @ODAncona, @aaronzs, @zeyuanyin, @gotjd709, @Musiyuan, @YanxingLiu, @RunningLeon, @ytzfhqs, @zhangzhidaSunny, @yeungkong, @crazysteeaam, @timerring, @okotaku, @apatsekin, @Morty-Xu, @Markson-Young, @ZhaoQiiii, @Kuro96, @PhoenixZ810, @yhcao6, @myownskyW7, @jiongjiongli, @Johnson-Wang, @ryylcc, @guyleaf, @agpeshal, @SimonGuoNjust, @hhaAndroid
+
+## v3.1.0 (30/6/2023)
+
+### Highlights
+
+- Supports tracking algorithms including multi-object tracking (MOT) algorithms SORT, DeepSORT, StrongSORT, OCSORT, ByteTrack, QDTrack, and video instance segmentation (VIS) algorithm MaskTrackRCNN, Mask2Former-VIS.
+- Support [ViTDet](../../../projects/ViTDet)
+- Supports inference and evaluation of multimodal algorithms [GLIP](../../../configs/glip) and [XDecoder](../../../projects/XDecoder), and also supports datasets such as COCO semantic segmentation, COCO Caption, ADE20k general segmentation, and RefCOCO. GLIP fine-tuning will be supported in the future.
+- Provides a [gradio demo](https://github.com/open-mmlab/mmdetection/blob/dev-3.x/projects/gradio_demo/README.md) for image type tasks of MMDetection, making it easy for users to experience.
+
+### New Features
+
+- Support DSDL Dataset (#9801)
+- Support iSAID dataset (#10028)
+- Support VISION dataset (#10530)
+- Release SoftTeacher checkpoints (#10119)
+- Release `centernet-update_r50-caffe_fpn_ms-1x_coco` checkpoints  (#10327)
+- Support SIoULoss (#10290)
+- Support Eqlv2 loss (#10120)
+- Support CopyPaste when mask is not available (#10509)
+- Support MIM to download ODL dataset (#10460)
+- Support new config (#10566)
+
+### Bug Fixes
+
+- Fix benchmark scripts error in windows (#10128)
+- Fix error of `YOLOXModeSwitchHook` does not switch the mode when resumed from the checkpoint after switched (#10116)
+- Fix pred and weight dims unmatch in SmoothL1Loss (#10423)
+
+### Improvements
+
+- Update MMDet_Tutorial.ipynb (#10081)
+- Support to hide inference progress (#10519)
+- Replace mmcls with mmpretrain  (#10545)
+
+### Contributors
+
+A total of 29 developers contributed to this release.
+
+Thanks @lovelykite, @minato-ellie, @freepoet, @wufan-tb, @yalibian, @keyakiluo, @gihanjayatilaka, @i-aki-y, @xin-li-67, @RangeKing, @JingweiZhang12, @MambaWong, @lucianovk, @tall-josh, @xiuqhou, @jamiechoi1995, @YQisme, @yechenzhi, @bjzhb666, @xiexinch, @jamiechoi1995, @yarkable, @Renzhihan, @nijkah, @amaizr, @Lum1104, @zwhus, @Czm369, @hhaAndroid
+
+## v3.0.0 (6/4/2023)
+
+### Highlights
+
+- Support Semi-automatic annotation Base [Label-Studio](../../../projects/LabelStudio) (#10039)
+- Support [EfficientDet](../../../projects/EfficientDet) in projects (#9810)
+
+### New Features
+
+- File I/O migration and reconstruction (#9709)
+- Release DINO Swin-L 36e model (#9927)
+
+### Bug Fixes
+
+- Fix benchmark script (#9865)
+- Fix the crop method of PolygonMasks (#9858)
+- Fix Albu augmentation with the mask shape (#9918)
+- Fix `RTMDetIns` prior generator device error (#9964)
+- Fix `img_shape` in data pipeline (#9966)
+- Fix cityscapes import error (#9984)
+- Fix `solov2_r50_fpn_ms-3x_coco.py` config error (#10030)
+- Fix Conditional DETR AP and Log (#9889)
+- Fix accepting an unexpected argument local-rank in PyTorch 2.0 (#10050)
+- Fix `common/ms_3x_coco-instance.py` config error (#10056)
+- Fix compute flops error (#10051)
+- Delete `data_root` in `CocoOccludedSeparatedMetric` to fix bug (#9969)
+- Unifying metafile.yml (#9849)
+
+### Improvements
+
+- Added BoxInst r101 config (#9967)
+- Added config migration guide (#9960)
+- Added more social networking links (#10021)
+- Added RTMDet config introduce (#10042)
+- Added visualization docs (#9938, #10058)
+- Refined data_prepare docs (#9935)
+- Added support for setting the cache_size_limit parameter of dynamo in PyTorch 2.0 (#10054)
+- Updated coco_metric.py (#10033)
+- Update type hint (#10040)
+
+### Contributors
+
+A total of 19 developers contributed to this release.
+
+Thanks @IRONICBo, @vansin, @RangeKing, @Ghlerrix, @okotaku, @JosonChan1998, @zgzhengSE, @bobo0810, @yechenzh, @Zheng-LinXiao, @LYMDLUT, @yarkable, @xiejiajiannb, @chhluo, @BIGWangYuDong, @RangiLy, @zwhus, @hhaAndroid, @ZwwWayne
+
+## v3.0.0rc6 (24/2/2023)
+
+### Highlights
+
+- Support [Boxinst](../../../configs/boxinst), [Objects365 Dataset](../../../configs/objects365), and [Separated and Occluded COCO metric](../user_guides/useful_tools.md#COCO-Separated-&-Occluded-Mask-Metric)
+- Support [ConvNeXt-V2](../../../projects/ConvNeXt-V2), [DiffusionDet](../../../projects/DiffusionDet), and inference of [EfficientDet](../../../projects/EfficientDet) and [Detic](../../../projects/Detic) in `Projects`
+- Refactor [DETR](../../../configs/detr) series and support [Conditional-DETR](../../../configs/conditional_detr), [DAB-DETR](../../../configs/dab_detr), and [DINO](../../../configs/detr)
+- Support `DetInferencer` for inference, Test Time Augmentation, and automatically importing modules from registry
+- Support RTMDet-Ins ONNXRuntime and TensorRT [deployment](../../../configs/rtmdet/README.md#deployment-tutorial)
+- Support [calculating FLOPs of detectors](../user_guides/useful_tools.md#Model-Complexity)
+
+### New Features
+
+- Support [Boxinst](https://arxiv.org/abs/2012.02310) (#9525)
+- Support [Objects365 Dataset](https://openaccess.thecvf.com/content_ICCV_2019/papers/Shao_Objects365_A_Large-Scale_High-Quality_Dataset_for_Object_Detection_ICCV_2019_paper.pdf) (#9600)
+- Support [ConvNeXt-V2](http://arxiv.org/abs/2301.00808) in `Projects` (#9619)
+- Support [DiffusionDet](https://arxiv.org/abs/2211.09788) in `Projects` (#9639, #9768)
+- Support [Detic](http://arxiv.org/abs/2201.02605) inference in `Projects` (#9645)
+- Support [EfficientDet](https://arxiv.org/abs/1911.09070) inference in `Projects` (#9645)
+- Support [Separated and Occluded COCO metric](https://arxiv.org/abs/2210.10046) (#9710)
+- Support auto import modules from registry (#9143)
+- Refactor DETR series and support Conditional-DETR, DAB-DETR and DINO (#9646)
+- Support `DetInferencer` for inference (#9561)
+- Support Test Time Augmentation (#9452)
+- Support calculating FLOPs of detectors (#9777)
+
+### Bug Fixes
+
+- Fix deprecating old type alias due to new version of numpy (#9625, #9537)
+- Fix VOC metrics (#9784)
+- Fix the wrong link of RTMDet-x log (#9549)
+- Fix RTMDet link in README (#9575)
+- Fix MMDet get flops error (#9589)
+- Fix `use_depthwise` in RTMDet (#9624)
+- Fix `albumentations` augmentation post process with masks (#9551)
+- Fix DETR series Unit Test (#9647)
+- Fix `LoadPanopticAnnotations` bug (#9703)
+- Fix `isort` CI (#9680)
+- Fix amp pooling overflow (#9670)
+- Fix docstring about noise in DINO (#9747)
+- Fix potential bug in `MultiImageMixDataset` (#9764)
+
+### Improvements
+
+- Replace NumPy transpose with PyTorch permute to speed-up (#9762)
+- Deprecate `sklearn` (#9725)
+- Add RTMDet-Ins deployment guide (#9823)
+- Update RTMDet config and README (#9603)
+- Replace the models used in the tutorial document with RTMDet (#9843)
+- Adjust the minimum supported python version to 3.7 (#9602)
+- Support modifying palette through configuration (#9445)
+- Update README document in `Project` (#9599)
+- Replace `github` with `gitee` in `.pre-commit-config-zh-cn.yaml` file (#9586)
+- Use official `isort` in `.pre-commit-config.yaml` file (#9701)
+- Change MMCV minimum version to `2.0.0rc4` for `dev-3.x` (#9695)
+- Add Chinese version of single_stage_as_rpn.md and test_results_submission.md (#9434)
+- Add OpenDataLab download link (#9605, #9738)
+- Add type hints of several layers (#9346)
+- Add typehint for `DarknetBottleneck` (#9591)
+- Add dockerfile (#9659)
+- Add twitter, discord, medium, and youtube link (#9775)
+- Prepare for merging refactor-detr (#9656)
+- Add metafile to ConditionalDETR, DABDETR and DINO (#9715)
+- Support to modify `non_blocking` parameters (#9723)
+- Comment repeater visualizer register (#9740)
+- Update user guide: `finetune.md` and `inference.md` (#9578)
+
+### New Contributors
+
+- @NoFish-528 made their first contribution in <https://github.com/open-mmlab/mmdetection/pull/9346>
+- @137208 made their first contribution in <https://github.com/open-mmlab/mmdetection/pull/9434>
+- @lyviva made their first contribution in <https://github.com/open-mmlab/mmdetection/pull/9625>
+- @zwhus made their first contribution in <https://github.com/open-mmlab/mmdetection/pull/9589>
+- @zylo117 made their first contribution in <https://github.com/open-mmlab/mmdetection/pull/9670>
+- @chg0901 made their first contribution in <https://github.com/open-mmlab/mmdetection/pull/9740>
+- @DanShouzhu made their first contribution in https://github.com/open-mmlab/mmdetection/pull/9578
+
+### Contributors
+
+A total of 27 developers contributed to this release.
+
+Thanks @JosonChan1998, @RangeKing, @NoFish-528, @likyoo, @Xiangxu-0103, @137208, @PeterH0323, @tianleiSHI, @wufan-tb, @lyviva, @zwhus, @jshilong, @Li-Qingyun, @sanbuphy, @zylo117, @triple-Mu, @KeiChiTse, @LYMDLUT, @nijkah, @chg0901, @DanShouzhu, @zytx121, @vansin, @BIGWangYuDong, @hhaAndroid, @RangiLyu, @ZwwWayne
+
+## v3.0.0rc5 (26/12/2022)
+
+### Highlights
+
+- Support [RTMDet](https://arxiv.org/abs/2212.07784) instance segmentation models. The technical report of RTMDet is on [arxiv](https://arxiv.org/abs/2212.07784)
+- Support SSHContextModule in paper [SSH: Single Stage Headless Face Detector](https://arxiv.org/abs/1708.03979).
+
+### New Features
+
+- Support [RTMDet](https://arxiv.org/abs/2212.07784) instance segmentation models and improve RTMDet test config (#9494)
+- Support SSHContextModule in paper [SSH: Single Stage Headless Face Detector](https://arxiv.org/abs/1708.03979) (#8953)
+- Release [CondInst](https://arxiv.org/abs/2003.05664) pre-trained model (#9406)
+
+### Bug Fixes
+
+- Fix CondInst predict error when `batch_size` is greater than 1 in inference (#9400)
+- Fix the bug of visualization when the dtype of the pipeline output image is not uint8 in browse dataset (#9401)
+- Fix `analyze_logs.py` to plot mAP and calculate train time correctly (#9409)
+- Fix backward inplace error with `PAFPN` (#9450)
+- Fix config import links in model converters (#9441)
+- Fix `DeformableDETRHead` object has no attribute `loss_single` (#9477)
+- Fix the logic of pseudo bboxes predicted by teacher model in SemiBaseDetector (#9414)
+- Fix demo API in instance segmentation tutorial (#9226)
+- Fix `analyze_results` (#9380)
+- Fix the error that Readthedocs API cannot be displayed (#9510)
+- Fix the error when there are no prediction results and support visualize the groundtruth of TTA (#9840)
+
+### Improvements
+
+- Remove legacy `builder.py` (#9479)
+- Make sure the pipeline argument shape is in `(width, height)` order (#9324)
+- Add `.pre-commit-config-zh-cn.yaml` file (#9388)
+- Refactor dataset metainfo to lowercase (#9469)
+- Add PyTorch 1.13 checking in CI (#9478)
+- Adjust `FocalLoss` and `QualityFocalLoss` to allow different kinds of targets (#9481)
+- Refactor `setup.cfg` (#9370)
+- Clip saturation value to valid range `[0, 1]` (#9391)
+- Only keep meta and state_dict when publishing model (#9356)
+- Add segm evaluator in ms-poly_3x_coco_instance config (#9524)
+- Update deployment guide (#9527)
+- Update zh_cn `faq.md` (#9396)
+- Update `get_started` (#9480)
+- Update the zh_cn user_guides of `useful_tools.md` and `useful_hooks.md` (#9453)
+- Add type hints for `bfp` and `channel_mapper` (#9410)
+- Add type hints of several losses (#9397)
+- Add type hints and update docstring for task modules (#9468)
+
+### New Contributors
+
+- @lihua199710 made their first contribution in <https://github.com/open-mmlab/mmdetection/pull/9388>
+- @twmht made their first contribution in <https://github.com/open-mmlab/mmdetection/pull/9450>
+- @tianleiSHI made their first contribution in <https://github.com/open-mmlab/mmdetection/pull/9453>
+- @kitecats made their first contribution in <https://github.com/open-mmlab/mmdetection/pull/9481>
+- @QJC123654 made their first contribution in <https://github.com/open-mmlab/mmdetection/pull/9468>
+
+### Contributors
+
+A total of 20 developers contributed to this release.
+
+Thanks @liuyanyi, @RangeKing, @lihua199710, @MambaWong, @sanbuphy, @Xiangxu-0103, @twmht, @JunyaoHu, @Chan-Sun, @tianleiSHI, @zytx121, @kitecats, @QJC123654, @JosonChan1998, @lvhan028, @Czm369, @BIGWangYuDong, @RangiLyu, @hhaAndroid, @ZwwWayne
+
+## v3.0.0rc4 (23/11/2022)
+
+### Highlights
+
+- Support [CondInst](https://arxiv.org/abs/2003.05664)
+- Add `projects/` folder, which will be a place for some experimental models/features.
+- Support [SparseInst](https://arxiv.org/abs/2203.12827) in [`projects`](./projects/SparseInst/README.md)
+
+### New Features
+
+- Support [CondInst](https://arxiv.org/abs/2003.05664) (#9223)
+- Add `projects/` folder, which will be a place for some experimental models/features (#9341)
+- Support [SparseInst](https://arxiv.org/abs/2203.12827) in [`projects`](./projects/SparseInst/README.md) (#9377)
+
+### Bug Fixes
+
+- Fix `pixel_decoder_type` discrimination in MaskFormer Head. (#9176)
+- Fix wrong padding value in cached MixUp (#9259)
+- Rename `utils/typing.py` to `utils/typing_utils.py` to fix `collect_env` error (#9265)
+- Fix resume arg conflict (#9287)
+- Fix the configs of Faster R-CNN with caffe backbone (#9319)
+- Fix torchserve and update related documentation (#9343)
+- Fix bbox refine bug with sigmooid activation (#9538)
+
+### Improvements
+
+- Update the docs of GIoU Loss in README (#8810)
+- Handle dataset wrapper in `inference_detector` (#9144)
+- Update the type of `counts` in COCO's compressed RLE (#9274)
+- Support saving config file in `print_config` (#9276)
+- Update docs about video inference (#9305)
+- Update guide about model deployment (#9344)
+- Fix doc typos of useful tools (#9177)
+- Allow to resume from specific checkpoint in CLI (#9284)
+- Update FAQ about windows installation issues of pycocotools (#9292)
+
+### New Contributors
+
+- @Daa98 made their first contribution in <https://github.com/open-mmlab/mmdetection/pull/9274>
+- @lvhan028 made their first contribution in <https://github.com/open-mmlab/mmdetection/pull/9344>
+
+### Contributors
+
+A total of 12 developers contributed to this release.
+
+Thanks @sanbuphy, @Czm369, @Daa98, @jbwang1997, @BIGWangYuDong, @JosonChan1998, @lvhan028, @RunningLeon, @RangiLyu, @Daa98, @ZwwWayne, @hhaAndroid
+
+## v3.0.0rc3 (4/11/2022)
+
+Upgrade the minimum version requirement of MMEngine to 0.3.0 to use `ignore_key` of `ConcatDataset` for training VOC datasets (#9058)
+
+### Highlights
+
+- Support [CrowdDet](https://arxiv.org/abs/2003.09163) and [EIoU Loss](https://ieeexplore.ieee.org/document/9429909)
+- Support training detection models in Detectron2
+- Refactor Fast R-CNN
+
+### New Features
+
+- Support [CrowdDet](https://arxiv.org/abs/2003.09163) (#8744)
+- Support training detection models in Detectron2 with examples of Mask R-CNN, Faster R-CNN, and RetinaNet (#8672)
+- Support [EIoU Loss](https://ieeexplore.ieee.org/document/9429909) (#9086)
+
+### Bug Fixes
+
+- Fix `XMLDataset` image size error (#9216)
+- Fix bugs of empty_instances when predicting without nms in roi_head (#9015)
+- Fix the config file of DETR (#9158)
+- Fix SOLOv2 cannot dealing with empty gt image (#9192)
+- Fix inference demo (#9153)
+- Add `ignore_key` in VOC `ConcatDataset` (#9058)
+- Fix dumping results issue in test scripts. (#9241)
+- Fix configs of training coco subsets on MMDet 3.x (#9225)
+- Fix corner2hbox of HorizontalBoxes for supporting empty bboxes (#9140)
+
+### Improvements
+
+- Refactor Fast R-CNN (#9132)
+- Clean requirements of mmcv-full due to SyncBN (#9207)
+- Support training detection models in detectron2 (#8672)
+- Add `box_type` support for `DynamicSoftLabelAssigner` (#9179)
+- Make scipy as a default dependency in runtime (#9187)
+- Update eval_metric (#9062)
+- Add `seg_map_suffix` in `BaseDetDataset` (#9088)
+
+### New Contributors
+
+- @Wwupup made their first contribution in <https://github.com/open-mmlab/mmdetection/pull/9086>
+- @sanbuphy made their first contribution in <https://github.com/open-mmlab/mmdetection/pull/9153>
+- @cxiang26 made their first contribution in <https://github.com/open-mmlab/mmdetection/pull/9158>
+- @JosonChan1998 made their first contribution in <https://github.com/open-mmlab/mmdetection/pull/9225>
+
+### Contributors
+
+A total of 13 developers contributed to this release.
+
+Thanks @wanghonglie, @Wwupup, @sanbuphy, @BIGWangYuDong, @liuyanyi, @cxiang26, @jbwang1997, @ZwwWayne, @yuyoujiang, @RangiLyu, @hhaAndroid, @JosonChan1998, @Czm369
+
+## v3.0.0rc2 (21/10/2022)
+
+### Highlights
+
+- Support [imagenet pre-training](configs/rtmdet/cspnext_imagenet_pretrain) for RTMDet's backbone
+
+### New Features
+
+- Support [imagenet pre-training](configs/rtmdet/cspnext_imagenet_pretrain) for RTMDet's backbone (#8887)
+- Add `CrowdHumanDataset` and Metric (#8430)
+- Add `FixShapeResize` to support resize of fixed shape (#8665)
+
+### Bug Fixes
+
+- Fix `ConcatDataset` Import Error (#8909)
+- Fix `CircleCI` and `readthedoc` build failed (#8980, #8963)
+- Fix bitmap mask translate when `out_shape` is different (#8993)
+- Fix inconsistency in `Conv2d` weight channels (#8948)
+- Fix bugs when plotting loss curve by analyze_logs.py (#8944)
+- Fix type change of labels in `albumentations` (#9074)
+- Fix some docs and types error (#8818)
+- Update memory occupation of `RTMDet` in metafile (#9098)
+- Fix wrong arguments of `OpenImageMetrics` in the config (#9061)
+
+### Improvements
+
+- Refactor standard roi head with `box type` (#8658)
+- Support mask concatenation in `BitmapMasks` and `PolygonMasks` (#9006)
+- Update PyTorch and dependencies' version in dockerfile (#8845)
+- Update `robustness_eval.py` and `print_config` (#8452)
+- Make compatible with `ConfigDict` and `dict` in `dense_heads` (#8942)
+- Support logging coco metric copypaste (#9012)
+- Remove `Normalize` transform (#8913)
+- Support jittering the color of different instances of the same class (#8988)
+- Add assertion for missing key in `PackDetInputs` (#8982)
+
+### New Contributors
+
+- @Chan-Sun made their first contribution in <https://github.com/open-mmlab/mmdetection/pull/8909>
+- @MambaWong made their first contribution in <https://github.com/open-mmlab/mmdetection/pull/8913>
+- @yuyoujiang made their first contribution in <https://github.com/open-mmlab/mmdetection/pull/8437>
+- @sltlls made their first contribution in <https://github.com/open-mmlab/mmdetection/pull/8944>
+- @Nioolek made their first contribution in <https://github.com/open-mmlab/mmdetection/pull/8845>
+- @wufan-tb made their first contribution in <https://github.com/open-mmlab/mmdetection/pull/9061>
+
+### Contributors
+
+A total of 13 developers contributed to this release.
+
+Thanks @RangiLyu, @jbwang1997, @wanghonglie, @Chan-Sun, @RangeKing, @chhluo, @MambaWong, @yuyoujiang, @hhaAndroid, @sltlls, @Nioolek, @ZwwWayne, @wufan-tb
+
+## v3.0.0rc1 (26/9/2022)
+
+### Highlights
+
+- Release a high-precision, low-latency single-stage object detector [RTMDet](configs/rtmdet).
+
+### Bug Fixes
+
+- Fix UT to be compatible with PyTorch 1.6 (#8707)
+- Fix `NumClassCheckHook` bug when model is wrapped (#8794)
+- Update the right URL of R-50-FPN with BoundedIoULoss (#8805)
+- Fix potential bug of indices in RandAugment (#8826)
+- Fix some types and links (#8839, #8820, #8793, #8868)
+- Fix incorrect background fill values in `FSAF` and `RepPoints` Head (#8813)
+
+### Improvements
+
+- Refactored anchor head and base head with `box type` (#8625)
+- Refactored `SemiBaseDetector` and `SoftTeacher` (#8786)
+- Add list to dict keys to avoid modify loss dict (#8828)
+- Update `analyze_results.py` , `analyze_logs.py` and `loading.py` (#8430, #8402, #8784)
+- Support dump results in `test.py` (#8814)
+- Check empty predictions in `DetLocalVisualizer._draw_instances` (#8830)
+- Fix `floordiv` warning in `SOLO` (#8738)
+
+### Contributors
+
+A total of 16 developers contributed to this release.
+
+Thanks @ZwwWayne, @jbwang1997, @Czm369, @ice-tong, @Zheng-LinXiao, @chhluo, @RangiLyu, @liuyanyi, @wanghonglie, @levan92, @JiayuXu0, @nye0, @hhaAndroid, @xin-li-67, @shuxp, @zytx121
+
+## v3.0.0rc0 (31/8/2022)
+
+We are excited to announce the release of MMDetection 3.0.0rc0. MMDet 3.0.0rc0 is the first version of MMDetection 3.x, a part of the OpenMMLab 2.0 projects. Built upon the new [training engine](https://github.com/open-mmlab/mmengine), MMDet 3.x unifies the interfaces of the dataset, models, evaluation, and visualization with faster training and testing speed. It also provides a general semi-supervised object detection framework and strong baselines.
+
+### Highlights
+
+1. **New engine**. MMDet 3.x is based on [MMEngine](https://github.com/open-mmlab/mmengine), which provides a universal and powerful runner that allows more flexible customizations and significantly simplifies the entry points of high-level interfaces.
+
+2. **Unified interfaces**. As a part of the OpenMMLab 2.0 projects, MMDet 3.x unifies and refactors the interfaces and internal logic of training, testing, datasets, models, evaluation, and visualization. All the OpenMMLab 2.0 projects share the same design in those interfaces and logic to allow the emergence of multi-task/modality algorithms.
+
+3. **Faster speed**. We optimize the training and inference speed for common models and configurations, achieving a faster or similar speed than [Detection2](https://github.com/facebookresearch/detectron2/). Model details of benchmark will be updated in [this note](./benchmark.md#comparison-with-detectron2).
+
+4. **General semi-supervised object detection**. Benefitting from the unified interfaces, we support a general semi-supervised learning framework that works with all the object detectors supported in MMDet 3.x. Please refer to [semi-supervised object detection](../user_guides/semi_det.md) for details.
+
+5. **Strong baselines**. We release strong baselines of many popular models to enable fair comparisons among state-of-the-art models.
+
+6. **New features and algorithms**:
+
+   - Enable all the single-stage detectors to serve as region proposal networks
+   - [SoftTeacher](https://arxiv.org/abs/2106.09018)
+   - [the updated CenterNet](https://arxiv.org/abs/2103.07461)
+
+7. **More documentation and tutorials**. We add a bunch of documentation and tutorials to help users get started more smoothly. Read it [here](https://mmdetection.readthedocs.io/en/3.x/).
+
+### Breaking Changes
+
+MMDet 3.x has undergone significant changes for better design, higher efficiency, more flexibility, and more unified interfaces.
+Besides the changes in API, we briefly list the major breaking changes in this section.
+We will update the [migration guide](../migration.md) to provide complete details and migration instructions.
+Users can also refer to the [API doc](https://mmdetection.readthedocs.io/en/3.x/) for more details.
+
+#### Dependencies
+
+- MMDet 3.x runs on PyTorch>=1.6. We have deprecated the support of PyTorch 1.5 to embrace mixed precision training and other new features since PyTorch 1.6. Some models can still run on PyTorch 1.5, but the full functionality of MMDet 3.x is not guaranteed.
+- MMDet 3.x relies on MMEngine to run. MMEngine is a new foundational library for training deep learning models of OpenMMLab and is the core dependency of OpenMMLab 2.0 projects. The dependencies of file IO and training are migrated from MMCV 1.x to MMEngine.
+- MMDet 3.x relies on MMCV>=2.0.0rc0. Although MMCV no longer maintains the training functionalities since 2.0.0rc0, MMDet 3.x relies on the data transforms, CUDA operators, and image processing interfaces in MMCV. Note that the package `mmcv` is the version that provides pre-built CUDA operators and `mmcv-lite` does not since MMCV 2.0.0rc0, while `mmcv-full` has been deprecated since 2.0.0rc0.
+
+#### Training and testing
+
+- MMDet 3.x uses Runner in [MMEngine](https://github.com/open-mmlab/mmengine) rather than that in MMCV. The new Runner implements and unifies the building logic of the dataset, model, evaluation, and visualizer. Therefore, MMDet 3.x no longer maintains the building logic of those modules in `mmdet.train.apis` and `tools/train.py`. Those codes have been migrated into [MMEngine](https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/runner.py). Please refer to the [migration guide of Runner in MMEngine](https://mmengine.readthedocs.io/en/latest/migration/runner.html) for more details.
+- The Runner in MMEngine also supports testing and validation. The testing scripts are also simplified, which has similar logic to that in training scripts to build the runner.
+- The execution points of hooks in the new Runner have been enriched to allow more flexible customization. Please refer to the [migration guide of Hook in MMEngine](https://mmengine.readthedocs.io/en/latest/migration/hook.html) for more details.
+- Learning rate and momentum schedules have been migrated from Hook to [Parameter Scheduler in MMEngine](https://mmengine.readthedocs.io/en/latest/tutorials/param_scheduler.html). Please refer to the [migration guide of Parameter Scheduler in MMEngine](https://mmengine.readthedocs.io/en/latest/migration/param_scheduler.html) for more details.
+
+#### Configs
+
+- The [Runner in MMEngine](https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/runner.py) uses a different config structure to ease the understanding of the components in the runner. Users can read the [config example of MMDet 3.x](../user_guides/config.md) or refer to the [migration guide in MMEngine](https://mmengine.readthedocs.io/en/latest/migration/runner.html) for migration details.
+- The file names of configs and models are also refactored to follow the new rules unified across OpenMMLab 2.0 projects. The names of checkpoints are not updated for now as there is no BC-breaking of model weights between MMDet 3.x and 2.x. We will progressively replace all the model weights with those trained in MMDet 3.x. Please refer to the [user guides of config](../user_guides/config.md) for more details.
+
+#### Dataset
+
+The Dataset classes implemented in MMDet 3.x all inherit from the `BaseDetDataset`, which inherits from the [BaseDataset in MMEngine](https://mmengine.readthedocs.io/en/latest/advanced_tutorials/basedataset.html). In addition to the changes in interfaces, there are several changes in Dataset in MMDet 3.x.
+
+- All the datasets support serializing the internal data list to reduce the memory when multiple workers are built for data loading.
+- The internal data structure in the dataset is changed to be self-contained (without losing information like class names in MMDet 2.x) while keeping simplicity.
+- The evaluation functionality of each dataset has been removed from the dataset so that some specific evaluation metrics like COCO AP can be used to evaluate the prediction on other datasets.
+
+#### Data Transforms
+
+The data transforms in MMDet 3.x all inherits from `BaseTransform` in MMCV>=2.0.0rc0, which defines a new convention in OpenMMLab 2.0 projects.
+Besides the interface changes, there are several changes listed below:
+
+- The functionality of some data transforms (e.g., `Resize`) are decomposed into several transforms to simplify and clarify the usages.
+- The format of data dict processed by each data transform is changed according to the new data structure of dataset.
+- Some inefficient data transforms (e.g., normalization and padding) are moved into data preprocessor of model to improve data loading and training speed.
+- The same data transforms in different OpenMMLab 2.0 libraries have the same augmentation implementation and the logic given the same arguments, i.e., `Resize` in MMDet 3.x and MMSeg 1.x will resize the image in the exact same manner given the same arguments.
+
+#### Model
+
+The models in MMDet 3.x all inherit from `BaseModel` in MMEngine, which defines a new convention of models in OpenMMLab 2.0 projects.
+Users can refer to [the tutorial of the model in MMengine](https://mmengine.readthedocs.io/en/latest/tutorials/model.html) for more details.
+Accordingly, there are several changes as the following:
+
+- The model interfaces, including the input and output formats, are significantly simplified and unified following the new convention in MMDet 3.x.
+  Specifically, all the input data in training and testing are packed into `inputs` and `data_samples`, where `inputs` contains model inputs like a list of image tensors, and `data_samples` contains other information of the current data sample such as ground truths, region proposals, and model predictions. In this way, different tasks in MMDet 3.x can share the same input arguments, which makes the models more general and suitable for multi-task learning and some flexible training paradigms like semi-supervised learning.
+- The model has a data preprocessor module, which is used to pre-process the input data of the model. In MMDet 3.x, the data preprocessor usually does the necessary steps to form the input images into a batch, such as padding. It can also serve as a place for some special data augmentations or more efficient data transformations like normalization.
+- The internal logic of the model has been changed. In MMdet 2.x, model uses `forward_train`, `forward_test`, `simple_test`, and `aug_test` to deal with different model forward logics. In MMDet 3.x and OpenMMLab 2.0, the forward function has three modes: 'loss', 'predict', and 'tensor' for training, inference, and tracing or other purposes, respectively.
+  The forward function calls `self.loss`, `self.predict`, and `self._forward` given the modes 'loss', 'predict', and 'tensor', respectively.
+
+#### Evaluation
+
+The evaluation in MMDet 2.x strictly binds with the dataset. In contrast, MMDet 3.x decomposes the evaluation from dataset so that all the detection datasets can evaluate with COCO AP and other metrics implemented in MMDet 3.x.
+MMDet 3.x mainly implements corresponding metrics for each dataset, which are manipulated by [Evaluator](https://mmengine.readthedocs.io/en/latest/design/evaluator.html) to complete the evaluation.
+Users can build an evaluator in MMDet 3.x to conduct offline evaluation, i.e., evaluate predictions that may not produce in MMDet 3.x with the dataset as long as the dataset and the prediction follow the dataset conventions. More details can be found in the [tutorial in mmengine](https://mmengine.readthedocs.io/en/latest/tutorials/evaluation.html).
+
+#### Visualization
+
+The functions of visualization in MMDet 2.x are removed. Instead, in OpenMMLab 2.0 projects, we use [Visualizer](https://mmengine.readthedocs.io/en/latest/design/visualization.html) to visualize data. MMDet 3.x implements `DetLocalVisualizer` to allow visualization of ground truths, model predictions, feature maps, etc., at any place. It also supports sending the visualization data to any external visualization backends such as Tensorboard.
+
+### Improvements
+
+- Optimized training and testing speed of FCOS, RetinaNet, Faster R-CNN, Mask R-CNN, and Cascade R-CNN. The training speed of those models with some common training strategies is also optimized, including those with synchronized batch normalization and mixed precision training.
+- Support mixed precision training of all the models. However, some models may get undesirable performance due to some numerical issues. We will update the documentation and list the results (accuracy of failure) of mixed precision training.
+- Release strong baselines of some popular object detectors. Their accuracy and pre-trained checkpoints will be released.
+
+### Bug Fixes
+
+- DeepFashion dataset: the config and results have been updated.
+
+### New Features
+
+1. Support a general semi-supervised learning framework that works with all the object detectors supported in MMDet 3.x. Please refer to [semi-supervised object detection](../user_guides/semi_det.md) for details.
+2. Enable all the single-stage detectors to serve as region proposal networks. We give [an example of using FCOS as RPN](../user_guides/single_stage_as_rpn.md).
+3. Support a semi-supervised object detection algorithm: [SoftTeacher](https://arxiv.org/abs/2106.09018).
+4. Support [the updated CenterNet](https://arxiv.org/abs/2103.07461).
+5. Support data structures `HorizontalBoxes` and `BaseBoxes` to encapsulate different kinds of bounding boxes. We are migrating to use data structures of boxes to replace the use of pure tensor boxes. This will unify the usages of different kinds of bounding boxes in MMDet 3.x and MMRotate 1.x to simplify the implementation and reduce redundant codes.
+
+### Planned changes
+
+We list several planned changes of MMDet 3.0.0rc0 so that the community could more comprehensively know the progress of MMDet 3.x. Feel free to create a PR, issue, or discussion if you are interested, have any suggestions and feedback, or want to participate.
+
+1. Test-time augmentation: which is supported in MMDet 2.x, is not implemented in this version due to the limited time slot. We will support it in the following releases with a new and simplified design.
+2. Inference interfaces: unified inference interfaces will be supported in the future to ease the use of released models.
+3. Interfaces of useful tools that can be used in Jupyter Notebook or Colab: more useful tools that are implemented in the `tools` directory will have their python interfaces so that they can be used in Jupyter Notebook, Colab, and downstream libraries.
+4. Documentation: we will add more design docs, tutorials, and migration guidance so that the community can deep dive into our new design, participate the future development, and smoothly migrate downstream libraries to MMDet 3.x.
+5. Wandb visualization: MMDet 2.x supports data visualization since v2.25.0, which has not been migrated to MMDet 3.x for now. Since WandB provides strong visualization and experiment management capabilities, a `DetWandBVisualizer` and maybe a hook are planned to fully migrate those functionalities from MMDet 2.x.
+6. Full support of WiderFace dataset (#8508) and Fast R-CNN: we are verifying their functionalities and will fix related issues soon.
+7. Migrate DETR-series algorithms (#8655, #8533) and YOLOv3 on IPU (#8552) from MMDet 2.x.
+
+### Contributors
+
+A total of 11 developers contributed to this release.
+Thanks @shuxp, @wanghonglie, @Czm369, @BIGWangYuDong, @zytx121, @jbwang1997, @chhluo, @jshilong, @RangiLyu, @hhaAndroid, @ZwwWayne

docs/en/notes/changelog_v2.x.md

+# Changelog v2.x
+
+### v2.25.0 (31/5/2022)
+
+#### Highlights
+
+- Support dedicated `WandbLogger` hook
+- Support [ConvNeXt](configs/convnext), [DDOD](configs/ddod), [SOLOv2](configs/solov2)
+- Support [Mask2Former](configs/mask2former) for instance segmentation
+- Rename [config files of Mask2Former](configs/mask2former)
+
+#### Backwards incompatible changes
+
+- Rename [config files of Mask2Former](configs/mask2former) (#7571)
+
+  <table align="center">
+    <thead>
+        <tr align='center'>
+            <td>before v2.25.0</td>
+            <td>after v2.25.0</td>
+        </tr>
+    </thead>
+    <tbody><tr valign='top'>
+    <th>
+
+  - `mask2former_xxx_coco.py` represents config files for **panoptic segmentation**.
+
+  </th>
+    <th>
+
+  - `mask2former_xxx_coco.py` represents config files for **instance segmentation**.
+  - `mask2former_xxx_coco-panoptic.py` represents config files for **panoptic segmentation**.
+
+  </th></tr>
+  </tbody></table>
+
+#### New Features
+
+- Support [ConvNeXt](https://arxiv.org/abs/2201.03545) (#7281)
+- Support [DDOD](https://arxiv.org/abs/2107.02963) (#7279)
+- Support [SOLOv2](https://arxiv.org/abs/2003.10152) (#7441)
+- Support [Mask2Former](https://arxiv.org/abs/2112.01527) for instance segmentation (#7571, #8032)
+
+#### Bug Fixes
+
+- Enable YOLOX training on different devices (#7912)
+- Fix the log plot error when evaluation with `interval != 1` (#7784)
+- Fix RuntimeError of HTC (#8083)
+
+#### Improvements
+
+- Support dedicated `WandbLogger` hook (#7459)
+
+  Users can set
+
+  ```python
+  cfg.log_config.hooks = [
+    dict(type='MMDetWandbHook',
+         init_kwargs={'project': 'MMDetection-tutorial'},
+         interval=10,
+         log_checkpoint=True,
+         log_checkpoint_metadata=True,
+         num_eval_images=10)]
+  ```
+
+  in the config to use `MMDetWandbHook`. Example can be found in this [colab tutorial](https://colab.research.google.com/drive/1RCSXHZwDZvakFh3eo9RuNrJbCGqD0dru?usp=sharing#scrollTo=WTEdPDRaBz2C)
+
+- Add `AvoidOOM` to avoid OOM (#7434, #8091)
+
+  Try to use `AvoidCUDAOOM` to avoid GPU out of memory. It will first retry after calling `torch.cuda.empty_cache()`. If it still fails, it will then retry by converting the type of inputs to FP16 format. If it still fails, it will try to copy inputs from GPUs to CPUs to continue computing. Try AvoidOOM in code to make the code continue to run when GPU memory runs out:
+
+  ```python
+  from mmdet.utils import AvoidCUDAOOM
+
+  output = AvoidCUDAOOM.retry_if_cuda_oom(some_function)(input1, input2)
+  ```
+
+  Users can also try `AvoidCUDAOOM` as a decorator to make the code continue to run when GPU memory runs out:
+
+  ```python
+  from mmdet.utils import AvoidCUDAOOM
+
+  @AvoidCUDAOOM.retry_if_cuda_oom
+  def function(*args, **kwargs):
+      ...
+      return xxx
+  ```
+
+- Support reading `gpu_collect` from `cfg.evaluation.gpu_collect` (#7672)
+
+- Speedup the Video Inference by Accelerating data-loading Stage (#7832)
+
+- Support replacing the `${key}` with the value of `cfg.key` (#7492)
+
+- Accelerate result analysis in `analyze_result.py`. The evaluation time is speedup by 10 ~ 15 times and only tasks 10 ~ 15 minutes now. (#7891)
+
+- Support to set `block_dilations` in `DilatedEncoder` (#7812)
+
+- Support panoptic segmentation result analysis (#7922)
+
+- Release DyHead with Swin-Large backbone (#7733)
+
+- Documentations updating and adding
+
+  - Fix wrong default type of `act_cfg` in `SwinTransformer` (#7794)
+  - Fix text errors in the tutorials (#7959)
+  - Rewrite the [installation guide](docs/en/get_started.md) (#7897)
+  - [Useful hooks](docs/en/tutorials/useful_hooks.md) (#7810)
+  - Fix heading anchor in documentation  (#8006)
+  - Replace `markdownlint` with `mdformat` for avoiding installing ruby (#8009)
+
+#### Contributors
+
+A total of 20 developers contributed to this release.
+
+Thanks @ZwwWayne, @DarthThomas, @solyaH, @LutingWang, @chenxinfeng4, @Czm369, @Chenastron, @chhluo, @austinmw, @Shanyaliux @hellock, @Y-M-Y, @jbwang1997, @hhaAndroid, @Irvingao, @zhanggefan, @BIGWangYuDong, @Keiku, @PeterVennerstrom, @ayulockin
+
+### v2.24.0 (26/4/2022)
+
+#### Highlights
+
+- Support [Simple Copy-Paste is a Strong Data Augmentation Method for Instance Segmentation](https://arxiv.org/abs/2012.07177)
+- Support automatically scaling LR according to GPU number and samples per GPU
+- Support Class Aware Sampler that improves performance on OpenImages Dataset
+
+#### New Features
+
+- Support [Simple Copy-Paste is a Strong Data Augmentation Method for Instance Segmentation](https://arxiv.org/abs/2012.07177), see [example configs](configs/simple_copy_paste/mask_rcnn_r50_fpn_syncbn-all_rpn-2conv_ssj_scp_32x2_270k_coco.py) (#7501)
+
+- Support Class Aware Sampler, users can set
+
+  ```python
+  data=dict(train_dataloader=dict(class_aware_sampler=dict(num_sample_class=1))))
+  ```
+
+  in the config to use `ClassAwareSampler`. Examples can be found in [the configs of OpenImages Dataset](https://github.com/open-mmlab/mmdetection/tree/main/configs/openimages/faster_rcnn_r50_fpn_32x2_cas_1x_openimages.py).  (#7436)
+
+- Support automatically scaling LR according to GPU number and samples per GPU. (#7482)
+  In each config, there is a corresponding config of auto-scaling LR as below,
+
+  ```python
+  auto_scale_lr = dict(enable=True, base_batch_size=N)
+  ```
+
+  where `N` is the batch size used for the current learning rate in the config (also equals to `samples_per_gpu` * gpu number to train this config).
+  By default, we set `enable=False` so that the original usages will not be affected. Users can set `enable=True` in each config or add `--auto-scale-lr` after the command line to enable this feature and should check the correctness of `base_batch_size` in customized configs.
+
+- Support setting dataloader arguments in config and add functions to handle config compatibility. (#7668)
+  The comparison between the old and new usages is as below.
+
+  <table align="center">
+    <thead>
+        <tr align='center'>
+            <td>v2.23.0</td>
+            <td>v2.24.0</td>
+        </tr>
+    </thead>
+    <tbody><tr valign='top'>
+    <th>
+
+  ```python
+  data = dict(
+      samples_per_gpu=64, workers_per_gpu=4,
+      train=dict(type='xxx', ...),
+      val=dict(type='xxx', samples_per_gpu=4, ...),
+      test=dict(type='xxx', ...),
+  )
+  ```
+
+  </th>
+    <th>
+
+  ```python
+  # A recommended config that is clear
+  data = dict(
+      train=dict(type='xxx', ...),
+      val=dict(type='xxx', ...),
+      test=dict(type='xxx', ...),
+      # Use different batch size during inference.
+      train_dataloader=dict(samples_per_gpu=64, workers_per_gpu=4),
+      val_dataloader=dict(samples_per_gpu=8, workers_per_gpu=2),
+      test_dataloader=dict(samples_per_gpu=8, workers_per_gpu=2),
+  )
+
+  # Old style still works but allows to set more arguments about data loaders
+  data = dict(
+      samples_per_gpu=64,  # only works for train_dataloader
+      workers_per_gpu=4,  # only works for train_dataloader
+      train=dict(type='xxx', ...),
+      val=dict(type='xxx', ...),
+      test=dict(type='xxx', ...),
+      # Use different batch size during inference.
+      val_dataloader=dict(samples_per_gpu=8, workers_per_gpu=2),
+      test_dataloader=dict(samples_per_gpu=8, workers_per_gpu=2),
+  )
+  ```
+
+  </th></tr>
+  </tbody></table>
+
+- Support memory profile hook. Users can use it to monitor the memory usages during training as below (#7560)
+
+  ```python
+  custom_hooks = [
+      dict(type='MemoryProfilerHook', interval=50)
+  ]
+  ```
+
+- Support to run on PyTorch with MLU chip (#7578)
+
+- Support re-spliting data batch with tag (#7641)
+
+- Support the `DiceCost` used by [K-Net](https://arxiv.org/abs/2106.14855) in `MaskHungarianAssigner` (#7716)
+
+- Support splitting COCO data for Semi-supervised object detection (#7431)
+
+- Support Pathlib for Config.fromfile (#7685)
+
+- Support to use file client in OpenImages dataset (#7433)
+
+- Add a probability parameter to Mosaic transformation (#7371)
+
+- Support specifying interpolation mode in `Resize` pipeline (#7585)
+
+#### Bug Fixes
+
+- Avoid invalid bbox after deform_sampling (#7567)
+- Fix the issue that argument color_theme does not take effect when exporting confusion matrix (#7701)
+- Fix the `end_level` in Necks, which should be the index of the end input backbone level (#7502)
+- Fix the bug that `mix_results` may be None in `MultiImageMixDataset` (#7530)
+- Fix the bug in ResNet plugin when two plugins are used (#7797)
+
+#### Improvements
+
+- Enhance `load_json_logs` of analyze_logs.py for resumed training logs (#7732)
+- Add argument `out_file` in image_demo.py (#7676)
+- Allow mixed precision training with `SimOTAAssigner` (#7516)
+- Updated INF to 100000.0 to be the same as that in the official YOLOX (#7778)
+- Add documentations of:
+  - how to get channels of a new backbone (#7642)
+  - how to unfreeze the backbone network (#7570)
+  - how to train fast_rcnn model (#7549)
+  - proposals in Deformable DETR (#7690)
+  - from-scratch install script in get_started.md (#7575)
+- Release pre-trained models of
+  - [Mask2Former](configs/mask2former) (#7595, #7709)
+  - RetinaNet with ResNet-18 and release models (#7387)
+  - RetinaNet with EfficientNet backbone (#7646)
+
+#### Contributors
+
+A total of 27 developers contributed to this release.
+Thanks @jovialio, @zhangsanfeng2022, @HarryZJ, @jamiechoi1995, @nestiank, @PeterH0323, @RangeKing, @Y-M-Y, @mattcasey02, @weiji14, @Yulv-git, @xiefeifeihu, @FANG-MING, @meng976537406, @nijkah, @sudz123, @CCODING04, @SheffieldCao, @Czm369, @BIGWangYuDong, @zytx121, @jbwang1997, @chhluo, @jshilong, @RangiLyu, @hhaAndroid, @ZwwWayne
+
+### v2.23.0 (28/3/2022)
+
+#### Highlights
+
+- Support Mask2Former: [Masked-attention Mask Transformer for Universal Image Segmentation](https://arxiv.org/abs/2112.01527)
+- Support EfficientNet: [EfficientNet: Rethinking Model Scaling for Convolutional Neural Networks](https://arxiv.org/abs/1905.11946)
+- Support setting data root through environment variable `MMDET_DATASETS`, users don't have to modify the corresponding path in config files anymore.
+- Find a good recipe for fine-tuning high precision ResNet backbone pre-trained by Torchvision.
+
+#### New Features
+
+- Support [Mask2Former](configs/mask2former)(#6938)(#7466)(#7471)
+- Support [EfficientNet](configs/efficientnet) (#7514)
+- Support setting data root through environment variable `MMDET_DATASETS`, users don't have to modify the corresponding path in config files anymore. (#7386)
+- Support setting different seeds to different ranks (#7432)
+- Update the `dist_train.sh` so that the script can be used to support launching multi-node training on machines without slurm (#7415)
+- Find a good recipe for fine-tuning high precision ResNet backbone pre-trained by Torchvision (#7489)
+
+#### Bug Fixes
+
+- Fix bug in VOC unit test which removes the data directory (#7270)
+- Adjust the order of `get_classes` and `FileClient` (#7276)
+- Force the inputs of `get_bboxes` in yolox_head to float32 (#7324)
+- Fix misplaced arguments in LoadPanopticAnnotations (#7388)
+- Fix reduction=mean in CELoss. (#7449)
+- Update unit test of CrossEntropyCost (#7537)
+- Fix memory leaking in panpotic segmentation evaluation (#7538)
+- Fix the bug of shape broadcast in YOLOv3 (#7551)
+
+#### Improvements
+
+- Add Chinese version of onnx2tensorrt.md (#7219)
+- Update colab tutorials (#7310)
+- Update information about Localization Distillation (#7350)
+- Add Chinese version of `finetune.md` (#7178)
+- Update YOLOX log for non square input (#7235)
+- Add `nproc` in `coco_panoptic.py` for panoptic quality computing (#7315)
+- Allow to set channel_order in LoadImageFromFile (#7258)
+- Take point sample related functions out of mask_point_head (#7353)
+- Add instance evaluation for coco_panoptic (#7313)
+- Enhance the robustness of analyze_logs.py (#7407)
+- Supplementary notes of sync_random_seed (#7440)
+- Update docstring of cross entropy loss (#7472)
+- Update pascal voc result (#7503)
+- We create How-to documentation to record any questions about How to xxx. In this version, we added
+  - How to use Mosaic augmentation (#7507)
+  - How to use backbone in mmcls (#7438)
+  - How to produce and submit the prediction results of panoptic segmentation models on COCO test-dev set (#7430))
+
+#### Contributors
+
+A total of 27 developers contributed to this release.
+Thanks @ZwwWayne, @haofanwang, @shinya7y, @chhluo, @yangrisheng, @triple-Mu, @jbwang1997, @HikariTJU, @imflash217, @274869388, @zytx121, @matrixgame2018, @jamiechoi1995, @BIGWangYuDong, @JingweiZhang12, @Xiangxu-0103, @hhaAndroid, @jshilong, @osbm, @ceroytres, @bunge-bedstraw-herb, @Youth-Got, @daavoo, @jiangyitong, @RangiLyu, @CCODING04, @yarkable
+
+### v2.22.0 (24/2/2022)
+
+#### Highlights
+
+- Support MaskFormer: [Per-Pixel Classification is Not All You Need for Semantic Segmentation](https://arxiv.org/abs/2107.06278) (#7212)
+- Support DyHead: [Dynamic Head: Unifying Object Detection Heads with Attentions](https://arxiv.org/abs/2106.08322) (#6823)
+- Release a good recipe of using ResNet in object detectors pre-trained by [ResNet Strikes Back](https://arxiv.org/abs/2110.00476), which consistently brings about 3~4 mAP improvements over RetinaNet, Faster/Mask/Cascade Mask R-CNN (#7001)
+- Support [Open Images Dataset](https://storage.googleapis.com/openimages/web/index.html) (#6331)
+- Support TIMM backbone: [PyTorch Image Models](https://github.com/rwightman/pytorch-image-models) (#7020)
+
+#### New Features
+
+- Support [MaskFormer](configs/maskformer) (#7212)
+- Support [DyHead](configs/dyhead) (#6823)
+- Support [ResNet Strikes Back](configs/resnet_strikes_back) (#7001)
+- Support [OpenImages Dataset](configs/openimages) (#6331)
+- Support [TIMM backbone](configs/timm_example) (#7020)
+- Support visualization for Panoptic Segmentation (#7041)
+
+#### Breaking Changes
+
+In order to support the visualization for Panoptic Segmentation, the `num_classes` can not be `None` when using the `get_palette` function to determine whether to use the panoptic palette.
+
+#### Bug Fixes
+
+- Fix bug for the best checkpoints can not be saved when the `key_score` is None (#7101)
+- Fix MixUp transform filter boxes failing case (#7080)
+- Add missing properties in SABLHead (#7091)
+- Fix bug when NaNs exist in confusion matrix (#7147)
+- Fix PALETTE AttributeError in downstream task (#7230)
+
+#### Improvements
+
+- Speed up SimOTA matching (#7098)
+- Add Chinese translation of `docs_zh-CN/tutorials/init_cfg.md` (#7188)
+
+#### Contributors
+
+A total of 20 developers contributed to this release.
+Thanks @ZwwWayne, @hhaAndroid, @RangiLyu, @AronLin, @BIGWangYuDong, @jbwang1997, @zytx121, @chhluo, @shinya7y, @LuooChen, @dvansa, @siatwangmin, @del-zhenwu, @vikashranjan26, @haofanwang, @jamiechoi1995, @HJoonKwon, @yarkable, @zhijian-liu, @RangeKing
+
+### v2.21.0 (8/2/2022)
+
+### Breaking Changes
+
+To standardize the contents in config READMEs and meta files of OpenMMLab projects, the READMEs and meta files in each config directory have been significantly changed. The template will be released in the future, for now, you can refer to the examples of README for [algorithm](https://github.com/open-mmlab/mmdetection/blob/master/configs/faster_rcnn/README.md), [dataset](https://github.com/open-mmlab/mmdetection/blob/master/configs/deepfashion/README.md) and [backbone](https://github.com/open-mmlab/mmdetection/blob/master/configs/regnet/README.md). To align with the standard, the configs in dcn are put into to two directories named `dcn` and `dcnv2`.
+
+#### New Features
+
+- Allow to customize colors of different classes during visualization (#6716)
+- Support CPU training (#7016)
+- Add download script of COCO, LVIS, and VOC dataset (#7015)
+
+#### Bug Fixes
+
+- Fix weight conversion issue of RetinaNet with Swin-S (#6973)
+- Update `__repr__` of `Compose` (#6951)
+- Fix BadZipFile Error when build docker (#6966)
+- Fix bug in non-distributed multi-gpu training/testing (#7019)
+- Fix bbox clamp in PyTorch 1.10 (#7074)
+- Relax the requirement of PALETTE in dataset wrappers (#7085)
+- Keep the same weights before reassign in the PAA head (#7032)
+- Update code demo in doc (#7092)
+
+#### Improvements
+
+- Speed-up training by allow to set variables of multi-processing (#6974, #7036)
+- Add links of Chinese tutorials in readme (#6897)
+- Disable cv2 multiprocessing by default for acceleration (#6867)
+- Deprecate the support for "python setup.py test" (#6998)
+- Re-organize metafiles and config readmes (#7051)
+- Fix None grad problem during training TOOD by adding `SigmoidGeometricMean` (#7090)
+
+#### Contributors
+
+A total of 26 developers contributed to this release.
+Thanks @del-zhenwu, @zimoqingfeng, @srishilesh, @imyhxy, @jenhaoyang, @jliu-ac, @kimnamu, @ShengliLiu, @garvan2021, @ciusji, @DIYer22, @kimnamu, @q3394101, @zhouzaida, @gaotongxiao, @topsy404, @AntoAndGar, @jbwang1997, @nijkah, @ZwwWayne, @Czm369, @jshilong, @RangiLyu, @BIGWangYuDong, @hhaAndroid, @AronLin
+
+### v2.20.0 (27/12/2021)
+
+#### New Features
+
+- Support [TOOD](configs/tood/README.md): Task-aligned One-stage Object Detection (ICCV 2021 Oral) (#6746)
+- Support resuming from the latest checkpoint automatically (#6727)
+
+#### Bug Fixes
+
+- Fix wrong bbox `loss_weight` of the PAA head (#6744)
+- Fix the padding value of `gt_semantic_seg` in batch collating (#6837)
+- Fix test error of lvis when using `classwise` (#6845)
+- Avoid BC-breaking of `get_local_path`  (#6719)
+- Fix bug in `sync_norm_hook` when the BN layer does not exist (#6852)
+- Use pycocotools directly no matter what platform it is (#6838)
+
+#### Improvements
+
+- Add unit test for SimOTA with no valid bbox (#6770)
+- Use precommit to check readme (#6802)
+- Support selecting GPU-ids in non-distributed testing time (#6781)
+
+#### Contributors
+
+A total of 16 developers contributed to this release.
+Thanks @ZwwWayne, @Czm369, @jshilong, @RangiLyu, @BIGWangYuDong, @hhaAndroid, @jamiechoi1995, @AronLin, @Keiku, @gkagkos, @fcakyon, @www516717402, @vansin, @zactodd, @kimnamu, @jenhaoyang
+
+### v2.19.1 (14/12/2021)
+
+#### New Features
+
+- Release [YOLOX](configs/yolox/README.md) COCO pretrained models (#6698)
+
+#### Bug Fixes
+
+- Fix DCN initialization in DenseHead (#6625)
+- Fix initialization of ConvFCHead (#6624)
+- Fix PseudoSampler in RCNN (#6622)
+- Fix weight initialization in Swin and PVT (#6663)
+- Fix dtype bug in BaseDenseHead (#6767)
+- Fix SimOTA with no valid bbox (#6733)
+
+#### Improvements
+
+- Add an example of combining swin and one-stage models (#6621)
+- Add `get_ann_info` to dataset_wrappers (#6526)
+- Support keeping image ratio in the multi-scale training of YOLOX (#6732)
+- Support `bbox_clip_border` for the augmentations of YOLOX (#6730)
+
+#### Documents
+
+- Update metafile (#6717)
+- Add mmhuman3d in readme (#6699)
+- Update FAQ docs (#6587)
+- Add doc for `detect_anomalous_params` (#6697)
+
+#### Contributors
+
+A total of 11 developers contributed to this release.
+Thanks @ZwwWayne, @LJoson, @Czm369, @jshilong, @ZCMax, @RangiLyu, @BIGWangYuDong, @hhaAndroid, @zhaoxin111, @GT9505, @shinya7y
+
+### v2.19.0 (29/11/2021)
+
+#### Highlights
+
+- Support [Label Assignment Distillation](https://arxiv.org/abs/2108.10520)
+- Support `persistent_workers` for Pytorch >= 1.7
+- Align accuracy to the updated official YOLOX
+
+#### New Features
+
+- Support [Label Assignment Distillation](https://arxiv.org/abs/2108.10520) (#6342)
+- Support `persistent_workers` for Pytorch >= 1.7 (#6435)
+
+#### Bug Fixes
+
+- Fix repeatedly output warning message (#6584)
+- Avoid infinite GPU waiting in dist training (#6501)
+- Fix SSD512 config error (#6574)
+- Fix MMDetection model to ONNX command (#6558)
+
+#### Improvements
+
+- Refactor configs of FP16 models (#6592)
+- Align accuracy to the updated official YOLOX (#6443)
+- Speed up training and reduce memory cost when using PhotoMetricDistortion. (#6442)
+- Make OHEM work with seesaw loss (#6514)
+
+#### Documents
+
+- Update README.md (#6567)
+
+#### Contributors
+
+A total of 11 developers contributed to this release.
+Thanks @FloydHsiu, @RangiLyu, @ZwwWayne, @AndreaPi, @st9007a, @hachreak, @BIGWangYuDong, @hhaAndroid, @AronLin, @chhluo, @vealocia, @HarborYuan, @st9007a, @jshilong
+
+### v2.18.1 (15/11/2021)
+
+#### Highlights
+
+- Release [QueryInst](http://arxiv.org/abs/2105.01928) pre-trained weights (#6460)
+- Support plot confusion matrix (#6344)
+
+#### New Features
+
+- Release [QueryInst](http://arxiv.org/abs/2105.01928) pre-trained weights (#6460)
+- Support plot confusion matrix (#6344)
+
+#### Bug Fixes
+
+- Fix aug test error when the number of prediction bboxes is 0 (#6398)
+- Fix SpatialReductionAttention in PVT (#6488)
+- Fix wrong use of `trunc_normal_init` in PVT and Swin-Transformer (#6432)
+
+#### Improvements
+
+- Save the printed AP information of COCO API to logger (#6505)
+- Always map location to cpu when load checkpoint (#6405)
+- Set a random seed when the user does not set a seed (#6457)
+
+#### Documents
+
+- Chinese version of [Corruption Benchmarking](robustness_benchmarking.md) (#6375)
+- Fix config path in docs (#6396)
+- Update GRoIE readme (#6401)
+
+#### Contributors
+
+A total of 11 developers contributed to this release.
+Thanks @st9007a, @hachreak, @HarborYuan, @vealocia, @chhluo, @AndreaPi, @AronLin, @BIGWangYuDong, @hhaAndroid, @RangiLyu, @ZwwWayne
+
+### v2.18.0 (27/10/2021)
+
+#### Highlights
+
+- Support [QueryInst](http://arxiv.org/abs/2105.01928) (#6050)
+- Refactor dense heads to decouple onnx export logics from `get_bboxes` and speed up inference (#5317, #6003, #6369, #6268, #6315)
+
+#### New Features
+
+- Support [QueryInst](http://arxiv.org/abs/2105.01928) (#6050)
+- Support infinite sampler (#5996)
+
+#### Bug Fixes
+
+- Fix init_weight in fcn_mask_head (#6378)
+- Fix type error in imshow_bboxes of RPN (#6386)
+- Fix broken colab link in MMDetection Tutorial (#6382)
+- Make sure the device and dtype of scale_factor are the same as bboxes (#6374)
+- Remove sampling hardcode (#6317)
+- Fix RandomAffine bbox coordinate recorrection (#6293)
+- Fix init bug of final cls/reg layer in convfc head (#6279)
+- Fix img_shape broken in auto_augment (#6259)
+- Fix kwargs parameter missing error in two_stage (#6256)
+
+#### Improvements
+
+- Unify the interface of stuff head and panoptic head (#6308)
+- Polish readme (#6243)
+- Add code-spell pre-commit hook and fix a typo (#6306)
+- Fix typo (#6245, #6190)
+- Fix sampler unit test (#6284)
+- Fix `forward_dummy` of YOLACT to enable `get_flops` (#6079)
+- Fix link error in the config documentation (#6252)
+- Adjust the order to beautify the document (#6195)
+
+#### Refactors
+
+- Refactor one-stage get_bboxes logic (#5317)
+- Refactor ONNX export of One-Stage models (#6003, #6369)
+- Refactor dense_head and speedup (#6268)
+- Migrate to use prior_generator in training of dense heads (#6315)
+
+#### Contributors
+
+A total of 18 developers contributed to this release.
+Thanks @Boyden, @onnkeat, @st9007a, @vealocia, @yhcao6, @DapangpangX, @yellowdolphin, @cclauss, @kennymckormick,
+@pingguokiller, @collinzrj, @AndreaPi, @AronLin, @BIGWangYuDong, @hhaAndroid, @jshilong, @RangiLyu, @ZwwWayne
+
+### v2.17.0 (28/9/2021)
+
+#### Highlights
+
+- Support [PVT](https://arxiv.org/abs/2102.12122) and [PVTv2](https://arxiv.org/abs/2106.13797)
+- Support [SOLO](https://arxiv.org/abs/1912.04488)
+- Support large scale jittering and New Mask R-CNN baselines
+- Speed up `YOLOv3` inference
+
+#### New Features
+
+- Support [PVT](https://arxiv.org/abs/2102.12122) and [PVTv2](https://arxiv.org/abs/2106.13797) (#5780)
+- Support [SOLO](https://arxiv.org/abs/1912.04488) (#5832)
+- Support large scale jittering and New Mask R-CNN baselines (#6132)
+- Add a general data structure for the results of models (#5508)
+- Added a base class for one-stage instance segmentation (#5904)
+- Speed up `YOLOv3` inference (#5991)
+- Release Swin Transformer pre-trained models (#6100)
+- Support mixed precision training in `YOLOX` (#5983)
+- Support `val` workflow in `YOLACT` (#5986)
+- Add script to test `torchserve` (#5936)
+- Support `onnxsim` with dynamic input shape (#6117)
+
+#### Bug Fixes
+
+- Fix the function naming errors in `model_wrappers` (#5975)
+- Fix regression loss bug when the input is an empty tensor (#5976)
+- Fix scores not contiguous error in `centernet_head` (#6016)
+- Fix missing parameters bug in `imshow_bboxes` (#6034)
+- Fix bug in `aug_test` of `HTC` when the length of `det_bboxes` is 0 (#6088)
+- Fix empty proposal errors in the training of some two-stage models (#5941)
+- Fix `dynamic_axes` parameter error in `ONNX` dynamic shape export (#6104)
+- Fix `dynamic_shape` bug of `SyncRandomSizeHook` (#6144)
+- Fix the Swin Transformer config link error in the configuration (#6172)
+
+#### Improvements
+
+- Add filter rules in `Mosaic` transform (#5897)
+- Add size divisor in get flops to avoid some potential bugs (#6076)
+- Add Chinese translation of `docs_zh-CN/tutorials/customize_dataset.md` (#5915)
+- Add Chinese translation of `conventions.md` (#5825)
+- Add description of the output of data pipeline (#5886)
+- Add dataset information in the README file for `PanopticFPN` (#5996)
+- Add `extra_repr` for `DropBlock` layer to get details in the model printing (#6140)
+- Fix CI out of memory and add PyTorch1.9 Python3.9 unit tests (#5862)
+- Fix download links error of some model (#6069)
+- Improve the generalization of XML dataset (#5943)
+- Polish assertion error messages (#6017)
+- Remove `opencv-python-headless` dependency by `albumentations` (#5868)
+- Check dtype in transform unit tests (#5969)
+- Replace the default theme of documentation with PyTorch Sphinx Theme (#6146)
+- Update the paper and code fields in the metafile (#6043)
+- Support to customize padding value of segmentation map (#6152)
+- Support to resize multiple segmentation maps (#5747)
+
+#### Contributors
+
+A total of 24 developers contributed to this release.
+Thanks @morkovka1337, @HarborYuan, @guillaumefrd, @guigarfr, @www516717402, @gaotongxiao, @ypwhs, @MartaYang, @shinya7y, @justiceeem, @zhaojinjian0000, @VVsssssk, @aravind-anantha, @wangbo-zhao, @czczup, @whai362, @czczup, @marijnl, @AronLin, @BIGWangYuDong, @hhaAndroid, @jshilong, @RangiLyu, @ZwwWayne
+
+### v2.16.0 (30/8/2021)
+
+#### Highlights
+
+- Support [Panoptic FPN](https://arxiv.org/abs/1901.02446) and [Swin Transformer](https://arxiv.org/abs/2103.14030)
+
+#### New Features
+
+- Support [Panoptic FPN](https://arxiv.org/abs/1901.02446) and release models (#5577, #5902)
+- Support Swin Transformer backbone (#5748)
+- Release RetinaNet models pre-trained with multi-scale 3x schedule (#5636)
+- Add script to convert unlabeled image list to coco format (#5643)
+- Add hook to check whether the loss value is valid (#5674)
+- Add YOLO anchor optimizing tool (#5644)
+- Support export onnx models without post process. (#5851)
+- Support classwise evaluation in CocoPanopticDataset (#5896)
+- Adapt browse_dataset for concatenated datasets. (#5935)
+- Add `PatchEmbed` and `PatchMerging` with `AdaptivePadding` (#5952)
+
+#### Bug Fixes
+
+- Fix unit tests of YOLOX (#5859)
+- Fix lose randomness in `imshow_det_bboxes` (#5845)
+- Make output result of `ImageToTensor` contiguous (#5756)
+- Fix inference bug when calling `regress_by_class` in RoIHead in some cases (#5884)
+- Fix bug in CIoU loss where alpha should not have gradient. (#5835)
+- Fix the bug that `multiscale_output` is defined but not used in HRNet (#5887)
+- Set the priority of EvalHook to LOW. (#5882)
+- Fix a YOLOX bug when applying bbox rescaling in test mode (#5899)
+- Fix mosaic coordinate error (#5947)
+- Fix dtype of bbox in RandomAffine. (#5930)
+
+#### Improvements
+
+- Add Chinese version of `data_pipeline` and  (#5662)
+- Support to remove state dicts of EMA when publishing models. (#5858)
+- Refactor the loss function in HTC and SCNet (#5881)
+- Use warnings instead of logger.warning (#5540)
+- Use legacy coordinate in metric of VOC (#5627)
+- Add Chinese version of customize_losses (#5826)
+- Add Chinese version of model_zoo (#5827)
+
+#### Contributors
+
+A total of 19 developers contributed to this release.
+Thanks @ypwhs, @zywvvd, @collinzrj, @OceanPang, @ddonatien, @@haotian-liu, @viibridges, @Muyun99, @guigarfr, @zhaojinjian0000, @jbwang1997,@wangbo-zhao, @xvjiarui, @RangiLyu, @jshilong, @AronLin, @BIGWangYuDong, @hhaAndroid, @ZwwWayne
+
+### v2.15.1 (11/8/2021)
+
+#### Highlights
+
+- Support [YOLOX](https://arxiv.org/abs/2107.08430)
+
+#### New Features
+
+- Support [YOLOX](https://arxiv.org/abs/2107.08430)(#5756, #5758, #5760, #5767, #5770, #5774, #5777, #5808, #5828, #5848)
+
+#### Bug Fixes
+
+- Update correct SSD models. (#5789)
+- Fix casting error in mask structure (#5820)
+- Fix MMCV deployment documentation links. (#5790)
+
+#### Improvements
+
+- Use dynamic MMCV download link in TorchServe dockerfile (#5779)
+- Rename the function `upsample_like` to `interpolate_as` for more general usage (#5788)
+
+#### Contributors
+
+A total of 14 developers contributed to this release.
+Thanks @HAOCHENYE, @xiaohu2015, @HsLOL, @zhiqwang, @Adamdad, @shinya7y, @Johnson-Wang, @RangiLyu, @jshilong, @mmeendez8, @AronLin, @BIGWangYuDong, @hhaAndroid, @ZwwWayne
+
+### v2.15.0 (02/8/2021)
+
+#### Highlights
+
+- Support adding [MIM](https://github.com/open-mmlab/mim) dependencies during pip installation
+- Support MobileNetV2 for SSD-Lite and YOLOv3
+- Support Chinese Documentation
+
+#### New Features
+
+- Add function `upsample_like` (#5732)
+- Support to output pdf and epub format documentation (#5738)
+- Support and release Cascade Mask R-CNN 3x pre-trained models (#5645)
+- Add `ignore_index` to CrossEntropyLoss (#5646)
+- Support adding [MIM](https://github.com/open-mmlab/mim) dependencies during pip installation (#5676)
+- Add MobileNetV2 config and models for YOLOv3 (#5510)
+- Support COCO Panoptic Dataset (#5231)
+- Support ONNX export of cascade models (#5486)
+- Support DropBlock with RetinaNet (#5544)
+- Support MobileNetV2 SSD-Lite (#5526)
+
+#### Bug Fixes
+
+- Fix the device of label in multiclass_nms (#5673)
+- Fix error of backbone initialization from pre-trained checkpoint in config file (#5603, #5550)
+- Fix download links of RegNet pretrained weights (#5655)
+- Fix two-stage runtime error given empty proposal (#5559)
+- Fix flops count error in DETR (#5654)
+- Fix unittest for `NumClassCheckHook` when it is not used. (#5626)
+- Fix description bug of using custom dataset (#5546)
+- Fix bug of `multiclass_nms` that returns the global indices (#5592)
+- Fix `valid_mask` logic error in RPNHead (#5562)
+- Fix unit test error of pretrained configs (#5561)
+- Fix typo error in anchor_head.py (#5555)
+- Fix bug when using dataset wrappers (#5552)
+- Fix a typo error in demo/MMDet_Tutorial.ipynb (#5511)
+- Fixing crash in `get_root_logger` when `cfg.log_level` is not None (#5521)
+- Fix docker version (#5502)
+- Fix optimizer parameter error when using `IterBasedRunner` (#5490)
+
+#### Improvements
+
+- Add unit tests for MMTracking (#5620)
+- Add Chinese translation of documentation (#5718, #5618, #5558, #5423, #5593, #5421, #5408. #5369, #5419, #5530, #5531)
+- Update resource limit (#5697)
+- Update docstring for InstaBoost (#5640)
+- Support key `reduction_override` in all loss functions (#5515)
+- Use repeatdataset to accelerate CenterNet training (#5509)
+- Remove unnecessary code in autoassign (#5519)
+- Add documentation about `init_cfg` (#5273)
+
+#### Contributors
+
+A total of 18 developers contributed to this release.
+Thanks @OceanPang, @AronLin, @hellock, @Outsider565, @RangiLyu, @ElectronicElephant, @likyoo, @BIGWangYuDong, @hhaAndroid, @noobying, @yyz561, @likyoo,
+@zeakey, @ZwwWayne, @ChenyangLiu, @johnson-magic, @qingswu, @BuxianChen
+
+### v2.14.0 (29/6/2021)
+
+#### Highlights
+
+- Add `simple_test` to dense heads to improve the consistency of single-stage and two-stage detectors
+- Revert the `test_mixins` to single image test to improve efficiency and readability
+- Add Faster R-CNN and Mask R-CNN config using multi-scale training with 3x schedule
+
+#### New Features
+
+- Support pretrained models from MoCo v2 and SwAV (#5286)
+- Add Faster R-CNN and Mask R-CNN config using multi-scale training with 3x schedule (#5179, #5233)
+- Add `reduction_override` in MSELoss (#5437)
+- Stable support of exporting DETR to ONNX with dynamic shapes and batch inference (#5168)
+- Stable support of exporting PointRend to ONNX with dynamic shapes and batch inference (#5440)
+
+#### Bug Fixes
+
+- Fix size mismatch bug in `multiclass_nms` (#4980)
+- Fix the import path of `MultiScaleDeformableAttention` (#5338)
+- Fix errors in config of GCNet ResNext101 models (#5360)
+- Fix Grid-RCNN error when there is no bbox result (#5357)
+- Fix errors in `onnx_export` of bbox_head when setting reg_class_agnostic (#5468)
+- Fix type error of AutoAssign in the document (#5478)
+- Fix web links ending with `.md` (#5315)
+
+#### Improvements
+
+- Add `simple_test` to dense heads to improve the consistency of single-stage and two-stage detectors (#5264)
+- Add support for mask diagonal flip in TTA (#5403)
+- Revert the `test_mixins` to single image test to improve efficiency and readability (#5249)
+- Make YOLOv3 Neck more flexible (#5218)
+- Refactor SSD to make it more general (#5291)
+- Refactor `anchor_generator` and `point_generator` (#5349)
+- Allow to configure out the `mask_head` of the HTC algorithm (#5389)
+- Delete deprecated warning in FPN (#5311)
+- Move `model.pretrained` to `model.backbone.init_cfg` (#5370)
+- Make deployment tools more friendly to use (#5280)
+- Clarify installation documentation (#5316)
+- Add ImageNet Pretrained Models docs (#5268)
+- Add FAQ about training loss=nan solution and COCO AP or AR =-1 (# 5312, #5313)
+- Change all weight links of http to https (#5328)
+
+### v2.13.0 (01/6/2021)
+
+#### Highlights
+
+- Support new methods: [CenterNet](https://arxiv.org/abs/1904.07850), [Seesaw Loss](https://arxiv.org/abs/2008.10032), [MobileNetV2](https://arxiv.org/abs/1801.04381)
+
+#### New Features
+
+- Support paper [Objects as Points](https://arxiv.org/abs/1904.07850) (#4602)
+- Support paper [Seesaw Loss for Long-Tailed Instance Segmentation (CVPR 2021)](https://arxiv.org/abs/2008.10032) (#5128)
+- Support [MobileNetV2](https://arxiv.org/abs/1801.04381) backbone and inverted residual block (#5122)
+- Support [MIM](https://github.com/open-mmlab/mim) (#5143)
+- ONNX exportation with dynamic shapes of CornerNet (#5136)
+- Add `mask_soft` config option to allow non-binary masks (#4615)
+- Add PWC metafile (#5135)
+
+#### Bug Fixes
+
+- Fix YOLOv3 FP16 training error (#5172)
+- Fix Cacscade R-CNN TTA test error when `det_bboxes` length is 0  (#5221)
+- Fix `iou_thr` variable naming errors in VOC recall calculation function (#5195)
+- Fix Faster R-CNN performance dropped in ONNX Runtime (#5197)
+- Fix DETR dict changed error when using python 3.8 during iteration  (#5226)
+
+#### Improvements
+
+- Refactor ONNX export of two stage detector (#5205)
+- Replace MMDetection's EvalHook with MMCV's EvalHook for consistency  (#4806)
+- Update RoI extractor for ONNX (#5194)
+- Use better parameter initialization in YOLOv3 head for higher performance (#5181)
+- Release new DCN models of Mask R-CNN by mixed-precision training (#5201)
+- Update YOLOv3 model weights (#5229)
+- Add DetectoRS ResNet-101 model weights (#4960)
+- Discard bboxes with sizes equals to `min_bbox_size` (#5011)
+- Remove duplicated code in DETR head (#5129)
+- Remove unnecessary object in class definition (#5180)
+- Fix doc link (#5192)
+
+### v2.12.0 (01/5/2021)
+
+#### Highlights
+
+- Support new methods: [AutoAssign](https://arxiv.org/abs/2007.03496), [YOLOF](https://arxiv.org/abs/2103.09460), and [Deformable DETR](https://arxiv.org/abs/2010.04159)
+- Stable support of exporting models to ONNX with batched images and dynamic shape (#5039)
+
+#### Backwards Incompatible Changes
+
+MMDetection is going through big refactoring for more general and convenient usages during the releases from v2.12.0 to v2.15.0 (maybe longer).
+In v2.12.0 MMDetection inevitably brings some BC-breakings, including the MMCV dependency, model initialization, model registry, and mask AP evaluation.
+
+- MMCV version. MMDetection v2.12.0 relies on the newest features in MMCV 1.3.3, including `BaseModule` for unified parameter initialization, model registry, and the CUDA operator `MultiScaleDeformableAttn` for [Deformable DETR](https://arxiv.org/abs/2010.04159). Note that MMCV 1.3.2 already contains all the features used by MMDet but has known issues. Therefore, we recommend users skip MMCV v1.3.2 and use v1.3.3, though v1.3.2 might work for most cases.
+- Unified model initialization (#4750). To unify the parameter initialization in OpenMMLab projects, MMCV supports `BaseModule` that accepts `init_cfg` to allow the modules' parameters initialized in a flexible and unified manner. Now the users need to explicitly call `model.init_weights()` in the training script to initialize the model (as in [here](https://github.com/open-mmlab/mmdetection/blob/master/tools/train.py#L162), previously this was handled by the detector. The models in MMDetection have been re-benchmarked to ensure accuracy based on PR #4750. __The downstream projects should update their code accordingly to use MMDetection v2.12.0__.
+- Unified model registry (#5059). To easily use backbones implemented in other OpenMMLab projects, MMDetection migrates to inherit the model registry created in MMCV (#760). In this way, as long as the backbone is supported in an OpenMMLab project and that project also uses the registry in MMCV, users can use that backbone in MMDetection by simply modifying the config without copying the code of that backbone into MMDetection.
+- Mask AP evaluation (#4898). Previous versions calculate the areas of masks through the bounding boxes when calculating the mask AP of small, medium, and large instances. To indeed use the areas of masks, we pop the key `bbox` during mask AP calculation. This change does not affect the overall mask AP evaluation and aligns the mask AP of similar models in other projects like Detectron2.
+
+#### New Features
+
+- Support paper [AutoAssign: Differentiable Label Assignment for Dense Object Detection](https://arxiv.org/abs/2007.03496) (#4295)
+- Support paper [You Only Look One-level Feature](https://arxiv.org/abs/2103.09460) (#4295)
+- Support paper [Deformable DETR: Deformable Transformers for End-to-End Object Detection](https://arxiv.org/abs/2010.04159) (#4778)
+- Support calculating IoU with FP16 tensor in `bbox_overlaps` to save memory and keep speed (#4889)
+- Add `__repr__` in custom dataset to count the number of instances (#4756)
+- Add windows support by updating requirements.txt (#5052)
+- Stable support of exporting models to ONNX with batched images and dynamic shape, including SSD, FSAF,FCOS, YOLOv3, RetinaNet, Faster R-CNN, and Mask R-CNN (#5039)
+
+#### Improvements
+
+- Use MMCV `MODEL_REGISTRY` (#5059)
+- Unified parameter initialization for more flexible usage (#4750)
+- Rename variable names and fix docstring in anchor head (#4883)
+- Support training with empty GT in Cascade RPN (#4928)
+- Add more details of usage of `test_robustness` in documentation (#4917)
+- Changing to use `pycocotools` instead of `mmpycocotools` to fully support Detectron2 and MMDetection in one environment (#4939)
+- Update torch serve dockerfile to support dockers of more versions (#4954)
+- Add check for training with single class dataset (#4973)
+- Refactor transformer and DETR Head (#4763)
+- Update FPG model zoo (#5079)
+- More accurate mask AP of small/medium/large instances (#4898)
+
+#### Bug Fixes
+
+- Fix bug in mean_ap.py when calculating mAP by 11 points (#4875)
+- Fix error when key `meta` is not in old checkpoints (#4936)
+- Fix hanging bug when training with empty GT in VFNet, GFL, and FCOS by changing the place of `reduce_mean` (#4923, #4978, #5058)
+- Fix asyncronized inference error and provide related demo (#4941)
+- Fix IoU losses dimensionality unmatch error (#4982)
+- Fix torch.randperm whtn using PyTorch 1.8 (#5014)
+- Fix empty bbox error in `mask_head` when using CARAFE (#5062)
+- Fix `supplement_mask` bug when there are zero-size RoIs (#5065)
+- Fix testing with empty rois in RoI Heads (#5081)
+
+### v2.11.0 (01/4/2021)
+
+__Highlights__
+
+- Support new method: [Localization Distillation for Object Detection](https://arxiv.org/pdf/2102.12252.pdf)
+- Support Pytorch2ONNX with batch inference and dynamic shape
+
+__New Features__
+
+- Support [Localization Distillation for Object Detection](https://arxiv.org/pdf/2102.12252.pdf) (#4758)
+- Support Pytorch2ONNX with batch inference and dynamic shape for Faster-RCNN and mainstream one-stage detectors (#4796)
+
+__Improvements__
+
+- Support batch inference in head of RetinaNet (#4699)
+- Add batch dimension in second stage of Faster-RCNN (#4785)
+- Support batch inference in bbox coder (#4721)
+- Add check for `ann_ids` in `COCODataset` to ensure it is unique (#4789)
+- support for showing the FPN results (#4716)
+- support dynamic shape for grid_anchor (#4684)
+- Move pycocotools version check to when it is used (#4880)
+
+__Bug Fixes__
+
+- Fix a bug of TridentNet when doing the batch inference (#4717)
+- Fix a bug of Pytorch2ONNX in FASF (#4735)
+- Fix a bug when show the image with float type (#4732)
+
+### v2.10.0 (01/03/2021)
+
+#### Highlights
+
+- Support new methods: [FPG](https://arxiv.org/abs/2004.03580)
+- Support ONNX2TensorRT for SSD, FSAF, FCOS, YOLOv3, and Faster R-CNN.
+
+#### New Features
+
+- Support ONNX2TensorRT for SSD, FSAF, FCOS, YOLOv3, and Faster R-CNN (#4569)
+- Support [Feature Pyramid Grids (FPG)](https://arxiv.org/abs/2004.03580) (#4645)
+- Support video demo (#4420)
+- Add seed option for sampler (#4665)
+- Support to customize type of runner (#4570, #4669)
+- Support synchronizing BN buffer in `EvalHook` (#4582)
+- Add script for GIF demo (#4573)
+
+#### Bug Fixes
+
+- Fix ConfigDict AttributeError and add Colab link (#4643)
+- Avoid crash in empty gt training of GFL head (#4631)
+- Fix `iou_thrs` bug in RPN evaluation (#4581)
+- Fix syntax error of config when upgrading model version (#4584)
+
+#### Improvements
+
+- Refactor unit test file structures (#4600)
+- Refactor nms config (#4636)
+- Get loading pipeline by checking the class directly rather than through config strings (#4619)
+- Add doctests for mask target generation and mask structures (#4614)
+- Use deep copy when copying pipeline arguments (#4621)
+- Update documentations (#4642, #4650, #4620, #4630)
+- Remove redundant code calling `import_modules_from_strings` (#4601)
+- Clean deprecated FP16 API (#4571)
+- Check whether `CLASSES` is correctly initialized in the initialization of `XMLDataset` (#4555)
+- Support batch inference in the inference API (#4462, #4526)
+- Clean deprecated warning and fix 'meta' error (#4695)
+
+### v2.9.0 (01/02/2021)
+
+#### Highlights
+
+- Support new methods: [SCNet](https://arxiv.org/abs/2012.10150), [Sparse R-CNN](https://arxiv.org/abs/2011.12450)
+- Move `train_cfg` and `test_cfg` into model in configs
+- Support to visualize results based on prediction quality
+
+#### New Features
+
+- Support [SCNet](https://arxiv.org/abs/2012.10150) (#4356)
+- Support [Sparse R-CNN](https://arxiv.org/abs/2011.12450) (#4219)
+- Support evaluate mAP by multiple IoUs (#4398)
+- Support concatenate dataset for testing (#4452)
+- Support to visualize results based on prediction quality (#4441)
+- Add ONNX simplify option to Pytorch2ONNX script (#4468)
+- Add hook for checking compatibility of class numbers in heads and datasets (#4508)
+
+#### Bug Fixes
+
+- Fix CPU inference bug of Cascade RPN (#4410)
+- Fix NMS error of CornerNet when there is no prediction box (#4409)
+- Fix TypeError in CornerNet inference (#4411)
+- Fix bug of PAA when training with background images (#4391)
+- Fix the error that the window data is not destroyed when `out_file is not None` and `show==False` (#4442)
+- Fix order of NMS `score_factor` that will decrease the performance of YOLOv3 (#4473)
+- Fix bug in HTC TTA when the number of detection boxes is 0 (#4516)
+- Fix resize error in mask data structures (#4520)
+
+#### Improvements
+
+- Allow to customize classes in LVIS dataset (#4382)
+- Add tutorials for building new models with existing datasets (#4396)
+- Add CPU compatibility information in documentation (#4405)
+- Add documentation of deprecated `ImageToTensor` for batch inference (#4408)
+- Add more details in documentation for customizing dataset (#4430)
+- Switch `imshow_det_bboxes` visualization backend from OpenCV to Matplotlib (#4389)
+- Deprecate `ImageToTensor` in `image_demo.py` (#4400)
+- Move train_cfg/test_cfg into model (#4347, #4489)
+- Update docstring for `reg_decoded_bbox` option in bbox heads (#4467)
+- Update dataset information in documentation (#4525)
+- Release pre-trained R50 and R101 PAA detectors with multi-scale 3x training schedules (#4495)
+- Add guidance for speed benchmark (#4537)
+
+### v2.8.0 (04/01/2021)
+
+#### Highlights
+
+- Support new methods: [Cascade RPN](https://arxiv.org/abs/1909.06720), [TridentNet](https://arxiv.org/abs/1901.01892)
+
+#### New Features
+
+- Support [Cascade RPN](https://arxiv.org/abs/1909.06720) (#1900)
+- Support [TridentNet](https://arxiv.org/abs/1901.01892) (#3313)
+
+#### Bug Fixes
+
+- Fix bug of show result in async_benchmark (#4367)
+- Fix scale factor in MaskTestMixin (#4366)
+- Fix but when returning indices in `multiclass_nms` (#4362)
+- Fix bug of empirical attention in resnext backbone error (#4300)
+- Fix bug of `img_norm_cfg` in FCOS-HRNet models with updated performance and models (#4250)
+- Fix invalid checkpoint and log in Mask R-CNN models on Cityscapes dataset (#4287)
+- Fix bug in distributed sampler when dataset is too small (#4257)
+- Fix bug of 'PAFPN has no attribute extra_convs_on_inputs' (#4235)
+
+#### Improvements
+
+- Update model url from aws to aliyun (#4349)
+- Update ATSS for PyTorch 1.6+ (#4359)
+- Update script to install ruby in pre-commit installation (#4360)
+- Delete deprecated `mmdet.ops` (#4325)
+- Refactor hungarian assigner for more general usage in Sparse R-CNN (#4259)
+- Handle scipy import in DETR to reduce package dependencies (#4339)
+- Update documentation of usages for config options after MMCV (1.2.3) supports overriding list in config (#4326)
+- Update pre-train models of faster rcnn trained on COCO subsets (#4307)
+- Avoid zero or too small value for beta in Dynamic R-CNN (#4303)
+- Add doccumentation for Pytorch2ONNX (#4271)
+- Add deprecated warning FPN arguments (#4264)
+- Support returning indices of kept bboxes when using nms (#4251)
+- Update type and device requirements when creating tensors `GFLHead` (#4210)
+- Update device requirements when creating tensors in `CrossEntropyLoss` (#4224)
+
+### v2.7.0 (30/11/2020)
+
+- Support new method: [DETR](https://arxiv.org/abs/2005.12872), [ResNest](https://arxiv.org/abs/2004.08955), Faster R-CNN DC5.
+- Support YOLO, Mask R-CNN, and Cascade R-CNN models exportable to ONNX.
+
+#### New Features
+
+- Support [DETR](https://arxiv.org/abs/2005.12872) (#4201, #4206)
+- Support to link the best checkpoint in training (#3773)
+- Support to override config through options in inference.py (#4175)
+- Support YOLO, Mask R-CNN, and Cascade R-CNN models exportable to ONNX (#4087, #4083)
+- Support [ResNeSt](https://arxiv.org/abs/2004.08955) backbone (#2959)
+- Support unclip border bbox regression (#4076)
+- Add tpfp func in evaluating AP (#4069)
+- Support mixed precision training of SSD detector with other backbones (#4081)
+- Add Faster R-CNN DC5 models (#4043)
+
+#### Bug Fixes
+
+- Fix bug of `gpu_id` in distributed training mode (#4163)
+- Support Albumentations with version higher than 0.5 (#4032)
+- Fix num_classes bug in faster rcnn config (#4088)
+- Update code in docs/2_new_data_model.md (#4041)
+
+#### Improvements
+
+- Ensure DCN offset to have similar type as features in VFNet (#4198)
+- Add config links in README files of models (#4190)
+- Add tutorials for loss conventions (#3818)
+- Add solution to installation issues in 30-series GPUs (#4176)
+- Update docker version in get_started.md (#4145)
+- Add model statistics and polish some titles in configs README (#4140)
+- Clamp neg probability in FreeAnchor (#4082)
+- Speed up expanding large images (#4089)
+- Fix Pytorch 1.7 incompatibility issues (#4103)
+- Update trouble shooting page to resolve segmentation fault (#4055)
+- Update aLRP-Loss in project page (#4078)
+- Clean duplicated `reduce_mean` function (#4056)
+- Refactor Q&A (#4045)
+
+### v2.6.0 (1/11/2020)
+
+- Support new method: [VarifocalNet](https://arxiv.org/abs/2008.13367).
+- Refactored documentation with more tutorials.
+
+#### New Features
+
+- Support GIoU calculation in `BboxOverlaps2D`, and re-implement `giou_loss` using `bbox_overlaps` (#3936)
+- Support random sampling in CPU mode (#3948)
+- Support VarifocalNet (#3666, #4024)
+
+#### Bug Fixes
+
+- Fix SABL validating bug in Cascade R-CNN (#3913)
+- Avoid division by zero in PAA head when num_pos=0 (#3938)
+- Fix temporary directory bug of multi-node testing error (#4034, #4017)
+- Fix `--show-dir` option in test script (#4025)
+- Fix GA-RetinaNet r50 model url (#3983)
+- Update code in docs and fix broken urls (#3947)
+
+#### Improvements
+
+- Refactor pytorch2onnx API into `mmdet.core.export` and use `generate_inputs_and_wrap_model` for pytorch2onnx (#3857, #3912)
+- Update RPN upgrade scripts for v2.5.0 compatibility (#3986)
+- Use mmcv `tensor2imgs` (#4010)
+- Update test robustness (#4000)
+- Update trouble shooting page (#3994)
+- Accelerate PAA training speed (#3985)
+- Support batch_size > 1 in validation (#3966)
+- Use RoIAlign implemented in MMCV for inference in CPU mode (#3930)
+- Documentation refactoring (#4031)
+
+### v2.5.0 (5/10/2020)
+
+#### Highlights
+
+- Support new methods: [YOLACT](https://arxiv.org/abs/1904.02689), [CentripetalNet](https://arxiv.org/abs/2003.09119).
+- Add more documentations for easier and more clear usage.
+
+#### Backwards Incompatible Changes
+
+__FP16 related methods are imported from mmcv instead of mmdet. (#3766, #3822)__
+Mixed precision training utils in `mmdet.core.fp16` are moved to `mmcv.runner`, including `force_fp32`, `auto_fp16`, `wrap_fp16_model`, and `Fp16OptimizerHook`. A deprecation warning will be raised if users attempt to import those methods from `mmdet.core.fp16`, and will be finally removed in V2.10.0.
+
+__\[0, N-1\] represents foreground classes and N indicates background classes for all models. (#3221)__
+Before v2.5.0, the background label for RPN is 0, and N for other heads. Now the behavior is consistent for all models. Thus `self.background_labels` in `dense_heads` is removed and all heads use `self.num_classes` to indicate the class index of background labels.
+This change has no effect on the pre-trained models in the v2.x model zoo, but will affect the training of all models with RPN heads. Two-stage detectors whose RPN head uses softmax will be affected because the order of categories is changed.
+
+**Only call `get_subset_by_classes` when `test_mode=True` and `self.filter_empty_gt=True` (#3695)**
+Function `get_subset_by_classes` in dataset is refactored and only filters out images when `test_mode=True` and `self.filter_empty_gt=True`.
+In the original implementation, `get_subset_by_classes` is not related to the flag `self.filter_empty_gt` and will only be called when the classes is set during initialization no matter `test_mode` is `True` or `False`. This brings ambiguous behavior and potential bugs in many cases. After v2.5.0, if `filter_empty_gt=False`, no matter whether the classes are specified in a dataset, the dataset will use all the images in the annotations. If `filter_empty_gt=True` and `test_mode=True`, no matter whether the classes are specified, the dataset will call \`\`get_subset_by_classes\` to check the images and filter out images containing no GT boxes. Therefore, the users should be responsible for the data filtering/cleaning process for the test dataset.
+
+#### New Features
+
+- Test time augmentation for single stage detectors (#3844, #3638)
+- Support to show the name of experiments during training (#3764)
+- Add `Shear`, `Rotate`, `Translate` Augmentation (#3656, #3619, #3687)
+- Add image-only transformations including `Constrast`, `Equalize`, `Color`, and `Brightness`. (#3643)
+- Support [YOLACT](https://arxiv.org/abs/1904.02689) (#3456)
+- Support [CentripetalNet](https://arxiv.org/abs/2003.09119) (#3390)
+- Support PyTorch 1.6 in docker (#3905)
+
+#### Bug Fixes
+
+- Fix the bug of training ATSS when there is no ground truth boxes (#3702)
+- Fix the bug of using Focal Loss when there is `num_pos` is 0 (#3702)
+- Fix the label index mapping in dataset browser (#3708)
+- Fix Mask R-CNN training stuck problem when their is no positive rois (#3713)
+- Fix the bug of `self.rpn_head.test_cfg` in `RPNTestMixin` by using `self.rpn_head` in rpn head (#3808)
+- Fix deprecated `Conv2d` from mmcv.ops (#3791)
+- Fix device bug in RepPoints (#3836)
+- Fix SABL validating bug (#3849)
+- Use `https://download.openmmlab.com/mmcv/dist/index.html` for installing MMCV (#3840)
+- Fix nonzero in NMS for PyTorch 1.6.0 (#3867)
+- Fix the API change bug of PAA (#3883)
+- Fix typo in bbox_flip (#3886)
+- Fix cv2 import error of ligGL.so.1 in Dockerfile (#3891)
+
+#### Improvements
+
+- Change to use `mmcv.utils.collect_env` for collecting environment information to avoid duplicate codes (#3779)
+- Update checkpoint file names to v2.0 models in documentation (#3795)
+- Update tutorials for changing runtime settings (#3778), modifying loss (#3777)
+- Improve the function of `simple_test_bboxes` in SABL (#3853)
+- Convert mask to bool before using it as img's index for robustness and speedup (#3870)
+- Improve documentation of modules and dataset customization (#3821)
+
+### v2.4.0 (5/9/2020)
+
+__Highlights__
+
+- Fix lots of issues/bugs and reorganize the trouble shooting page
+- Support new methods [SABL](https://arxiv.org/abs/1912.04260), [YOLOv3](https://arxiv.org/abs/1804.02767), and [PAA Assign](https://arxiv.org/abs/2007.08103)
+- Support Batch Inference
+- Start to publish `mmdet` package to PyPI since v2.3.0
+- Switch model zoo to download.openmmlab.com
+
+__Backwards Incompatible Changes__
+
+- Support Batch Inference (#3564, #3686, #3705): Since v2.4.0, MMDetection could inference model with multiple images in a single GPU.
+  This change influences all the test APIs in MMDetection and downstream codebases. To help the users migrate their code, we use `replace_ImageToTensor` (#3686) to convert legacy test data pipelines during dataset initialization.
+- Support RandomFlip with horizontal/vertical/diagonal direction (#3608): Since v2.4.0, MMDetection supports horizontal/vertical/diagonal flip in the data augmentation. This influences bounding box, mask, and image transformations in data augmentation process and the process that will map those data back to the original format.
+- Migrate to use `mmlvis` and `mmpycocotools` for COCO and LVIS dataset (#3727). The APIs are fully compatible with the original `lvis` and `pycocotools`. Users need to uninstall the existing pycocotools and lvis packages in their environment first and install `mmlvis` & `mmpycocotools`.
+
+__Bug Fixes__
+
+- Fix default mean/std for onnx (#3491)
+- Fix coco evaluation and add metric items (#3497)
+- Fix typo for install.md (#3516)
+- Fix atss when sampler per gpu is 1 (#3528)
+- Fix import of fuse_conv_bn (#3529)
+- Fix bug of gaussian_target, update unittest of heatmap (#3543)
+- Fixed VOC2012 evaluate (#3553)
+- Fix scale factor bug of rescale (#3566)
+- Fix with_xxx_attributes in base detector (#3567)
+- Fix boxes scaling when number is 0 (#3575)
+- Fix rfp check when neck config is a list (#3591)
+- Fix import of fuse conv bn in benchmark.py (#3606)
+- Fix webcam demo (#3634)
+- Fix typo and itemize issues in tutorial (#3658)
+- Fix error in distributed training when some levels of FPN are not assigned with bounding boxes (#3670)
+- Fix the width and height orders of stride in valid flag generation (#3685)
+- Fix weight initialization bug in Res2Net DCN (#3714)
+- Fix bug in OHEMSampler (#3677)
+
+__New Features__
+
+- Support Cutout augmentation (#3521)
+- Support evaluation on multiple datasets through ConcatDataset (#3522)
+- Support [PAA assign](https://arxiv.org/abs/2007.08103) #(3547)
+- Support eval metric with pickle results (#3607)
+- Support [YOLOv3](https://arxiv.org/abs/1804.02767) (#3083)
+- Support [SABL](https://arxiv.org/abs/1912.04260) (#3603)
+- Support to publish to Pypi in github-action (#3510)
+- Support custom imports (#3641)
+
+__Improvements__
+
+- Refactor common issues in documentation (#3530)
+- Add pytorch 1.6 to CI config (#3532)
+- Add config to runner meta (#3534)
+- Add eval-option flag for testing (#3537)
+- Add init_eval to evaluation hook (#3550)
+- Add include_bkg in ClassBalancedDataset (#3577)
+- Using config's loading in inference_detector (#3611)
+- Add ATSS ResNet-101 models in model zoo (#3639)
+- Update urls to download.openmmlab.com (#3665)
+- Support non-mask training for CocoDataset (#3711)
+
+### v2.3.0 (5/8/2020)
+
+__Highlights__
+
+- The CUDA/C++ operators have been moved to `mmcv.ops`. For backward compatibility `mmdet.ops` is kept as warppers of `mmcv.ops`.
+- Support new methods [CornerNet](https://arxiv.org/abs/1808.01244), [DIOU](https://arxiv.org/abs/1911.08287)/[CIOU](https://arxiv.org/abs/2005.03572) loss, and new dataset: [LVIS V1](https://arxiv.org/abs/1908.03195)
+- Provide more detailed colab training tutorials and more complete documentation.
+- Support to convert RetinaNet from Pytorch to ONNX.
+
+__Bug Fixes__
+
+- Fix the model initialization bug of DetectoRS (#3187)
+- Fix the bug of module names in NASFCOSHead (#3205)
+- Fix the filename bug in publish_model.py (#3237)
+- Fix the dimensionality bug when `inside_flags.any()` is `False` in dense heads (#3242)
+- Fix the bug of forgetting to pass flip directions in `MultiScaleFlipAug` (#3262)
+- Fixed the bug caused by default value of `stem_channels` (#3333)
+- Fix the bug of model checkpoint loading for CPU inference (#3318, #3316)
+- Fix topk bug when box number is smaller than the expected topk number in ATSSAssigner (#3361)
+- Fix the gt priority bug in center_region_assigner.py (#3208)
+- Fix NaN issue of iou calculation in iou_loss.py (#3394)
+- Fix the bug that `iou_thrs` is not actually used during evaluation in coco.py (#3407)
+- Fix test-time augmentation of RepPoints (#3435)
+- Fix runtimeError caused by incontiguous tensor in Res2Net+DCN (#3412)
+
+__New Features__
+
+- Support [CornerNet](https://arxiv.org/abs/1808.01244) (#3036)
+- Support [DIOU](https://arxiv.org/abs/1911.08287)/[CIOU](https://arxiv.org/abs/2005.03572) loss (#3151)
+- Support [LVIS V1](https://arxiv.org/abs/1908.03195) dataset (#)
+- Support customized hooks in training (#3395)
+- Support fp16 training of generalized focal loss (#3410)
+- Support to convert RetinaNet from Pytorch to ONNX (#3075)
+
+__Improvements__
+
+- Support to process ignore boxes in ATSS assigner (#3082)
+- Allow to crop images without ground truth in `RandomCrop` (#3153)
+- Enable the the `Accuracy` module to set threshold (#3155)
+- Refactoring unit tests (#3206)
+- Unify the training settings of `to_float32` and `norm_cfg` in RegNets configs (#3210)
+- Add colab training tutorials for beginners (#3213, #3273)
+- Move CUDA/C++ operators into `mmcv.ops` and keep `mmdet.ops` as warppers for backward compatibility (#3232)(#3457)
+- Update installation scripts in documentation (#3290) and dockerfile (#3320)
+- Support to set image resize backend (#3392)
+- Remove git hash in version file (#3466)
+- Check mmcv version to force version compatibility (#3460)
+
+### v2.2.0 (1/7/2020)
+
+__Highlights__
+
+- Support new methods: [DetectoRS](https://arxiv.org/abs/2006.02334), [PointRend](https://arxiv.org/abs/1912.08193), [Generalized Focal Loss](https://arxiv.org/abs/2006.04388), [Dynamic R-CNN](https://arxiv.org/abs/2004.06002)
+
+__Bug Fixes__
+
+- Fix FreeAnchor when no gt in image (#3176)
+- Clean up deprecated usage of `register_module()` (#3092, #3161)
+- Fix pretrain bug in NAS FCOS (#3145)
+- Fix `num_classes` in SSD (#3142)
+- Fix FCOS warmup (#3119)
+- Fix `rstrip` in `tools/publish_model.py`
+- Fix `flip_ratio` default value in RandomFLip pipeline (#3106)
+- Fix cityscapes eval with ms_rcnn (#3112)
+- Fix RPN softmax (#3056)
+- Fix filename of LVIS@v0.5 (#2998)
+- Fix nan loss by filtering out-of-frame gt_bboxes in COCO (#2999)
+- Fix bug in FSAF (#3018)
+- Add FocalLoss `num_classes` check (#2964)
+- Fix PISA Loss when there are no gts (#2992)
+- Avoid nan in `iou_calculator` (#2975)
+- Prevent possible bugs in loading and transforms caused by shallow copy (#2967)
+
+__New Features__
+
+- Add DetectoRS (#3064)
+- Support Generalize Focal Loss (#3097)
+- Support PointRend (#2752)
+- Support Dynamic R-CNN (#3040)
+- Add DeepFashion dataset (#2968)
+- Implement FCOS training tricks (#2935)
+- Use BaseDenseHead as base class for anchor-base heads (#2963)
+- Add `with_cp` for BasicBlock (#2891)
+- Add `stem_channels` argument for ResNet (#2954)
+
+__Improvements__
+
+- Add anchor free base head (#2867)
+- Migrate to github action (#3137)
+- Add docstring for datasets, pipelines, core modules and methods (#3130, #3125, #3120)
+- Add VOC benchmark (#3060)
+- Add `concat` mode in GRoI (#3098)
+- Remove cmd arg `autorescale-lr` (#3080)
+- Use `len(data['img_metas'])` to indicate `num_samples` (#3073, #3053)
+- Switch to EpochBasedRunner (#2976)
+
+### v2.1.0 (8/6/2020)
+
+__Highlights__
+
+- Support new backbones: [RegNetX](https://arxiv.org/abs/2003.13678), [Res2Net](https://arxiv.org/abs/1904.01169)
+- Support new methods: [NASFCOS](https://arxiv.org/abs/1906.04423), [PISA](https://arxiv.org/abs/1904.04821), [GRoIE](https://arxiv.org/abs/2004.13665)
+- Support new dataset: [LVIS](https://arxiv.org/abs/1908.03195)
+
+__Bug Fixes__
+
+- Change the CLI argument `--validate` to `--no-validate` to enable validation after training epochs by default. (#2651)
+- Add missing cython to docker file (#2713)
+- Fix bug in nms cpu implementation (#2754)
+- Fix bug when showing mask results (#2763)
+- Fix gcc requirement (#2806)
+- Fix bug in async test (#2820)
+- Fix mask encoding-decoding bugs in test API (#2824)
+- Fix bug in test time augmentation (#2858, #2921, #2944)
+- Fix a typo in comment of apis/train (#2877)
+- Fix the bug of returning None when no gt bboxes are in the original image in `RandomCrop`. Fix the bug that misses to handle `gt_bboxes_ignore`, `gt_label_ignore`, and `gt_masks_ignore` in `RandomCrop`, `MinIoURandomCrop` and `Expand` modules. (#2810)
+- Fix bug of `base_channels` of regnet (#2917)
+- Fix the bug of logger when loading pre-trained weights in base detector (#2936)
+
+__New Features__
+
+- Add IoU models (#2666)
+- Add colab demo for inference
+- Support class agnostic nms (#2553)
+- Add benchmark gathering scripts for development only (#2676)
+- Add mmdet-based project links (#2736, #2767, #2895)
+- Add config dump in training (#2779)
+- Add ClassBalancedDataset (#2721)
+- Add res2net backbone (#2237)
+- Support RegNetX models (#2710)
+- Use `mmcv.FileClient` to support different storage backends (#2712)
+- Add ClassBalancedDataset (#2721)
+- Code Release: Prime Sample Attention in Object Detection (CVPR 2020) (#2626)
+- Implement NASFCOS (#2682)
+- Add class weight in CrossEntropyLoss (#2797)
+- Support LVIS dataset (#2088)
+- Support GRoIE (#2584)
+
+__Improvements__
+
+- Allow different x and y strides in anchor heads. (#2629)
+- Make FSAF loss more robust to no gt (#2680)
+- Compute pure inference time instead (#2657) and update inference speed (#2730)
+- Avoided the possibility that a patch with 0 area is cropped. (#2704)
+- Add warnings when deprecated `imgs_per_gpu` is used. (#2700)
+- Add a mask rcnn example for config (#2645)
+- Update model zoo (#2762, #2866, #2876, #2879, #2831)
+- Add `ori_filename` to img_metas and use it in test show-dir (#2612)
+- Use `img_fields` to handle multiple images during image transform (#2800)
+- Add upsample_cfg support in FPN (#2787)
+- Add `['img']` as default `img_fields` for back compatibility (#2809)
+- Rename the pretrained model from `open-mmlab://resnet50_caffe` and `open-mmlab://resnet50_caffe_bgr` to `open-mmlab://detectron/resnet50_caffe` and `open-mmlab://detectron2/resnet50_caffe`. (#2832)
+- Added sleep(2) in test.py to reduce hanging problem (#2847)
+- Support `c10::half` in CARAFE (#2890)
+- Improve documentations (#2918, #2714)
+- Use optimizer constructor in mmcv and clean the original implementation in `mmdet.core.optimizer` (#2947)
+
+### v2.0.0 (6/5/2020)
+
+In this release, we made lots of major refactoring and modifications.
+
+1. __Faster speed__. We optimize the training and inference speed for common models, achieving up to 30% speedup for training and 25% for inference. Please refer to [model zoo](model_zoo.md#comparison-with-detectron2) for details.
+
+2. __Higher performance__. We change some default hyperparameters with no additional cost, which leads to a gain of performance for most models. Please refer to [compatibility](compatibility.md#training-hyperparameters) for details.
+
+3. __More documentation and tutorials__. We add a bunch of documentation and tutorials to help users get started more smoothly. Read it [here](https://mmdetection.readthedocs.io/en/latest/).
+
+4. __Support PyTorch 1.5__. The support for 1.1 and 1.2 is dropped, and we switch to some new APIs.
+
+5. __Better configuration system__. Inheritance is supported to reduce the redundancy of configs.
+
+6. __Better modular design__. Towards the goal of simplicity and flexibility, we simplify some encapsulation while add more other configurable modules like BBoxCoder, IoUCalculator, OptimizerConstructor, RoIHead. Target computation is also included in heads and the call hierarchy is simpler.
+
+7. Support new methods: [FSAF](https://arxiv.org/abs/1903.00621) and PAFPN (part of [PAFPN](https://arxiv.org/abs/1803.01534)).
+
+__Breaking Changes__
+Models training with MMDetection 1.x are not fully compatible with 2.0, please refer to the [compatibility doc](compatibility.md) for the details and how to migrate to the new version.
+
+__Improvements__
+
+- Unify cuda and cpp API for custom ops. (#2277)
+- New config files with inheritance. (#2216)
+- Encapsulate the second stage into RoI heads. (#1999)
+- Refactor GCNet/EmpericalAttention into plugins. (#2345)
+- Set low quality match as an option in IoU-based bbox assigners. (#2375)
+- Change the codebase's coordinate system. (#2380)
+- Refactor the category order in heads. 0 means the first positive class instead of background now. (#2374)
+- Add bbox sampler and assigner registry. (#2419)
+- Speed up the inference of RPN. (#2420)
+- Add `train_cfg` and `test_cfg` as class members in all anchor heads. (#2422)
+- Merge target computation methods into heads. (#2429)
+- Add bbox coder to support different bbox encoding and losses. (#2480)
+- Unify the API for regression loss. (#2156)
+- Refactor Anchor Generator. (#2474)
+- Make `lr` an optional argument for optimizers. (#2509)
+- Migrate to modules and methods in MMCV. (#2502, #2511, #2569, #2572)
+- Support PyTorch 1.5. (#2524)
+- Drop the support for Python 3.5 and use F-string in the codebase. (#2531)
+
+__Bug Fixes__
+
+- Fix the scale factors for resized images without keep the aspect ratio. (#2039)
+- Check if max_num > 0 before slicing in NMS. (#2486)
+- Fix Deformable RoIPool when there is no instance. (#2490)
+- Fix the default value of assigned labels. (#2536)
+- Fix the evaluation of Cityscapes. (#2578)
+
+__New Features__
+
+- Add deep_stem and avg_down option to ResNet, i.e., support ResNetV1d. (#2252)
+- Add L1 loss. (#2376)
+- Support both polygon and bitmap for instance masks. (#2353, #2540)
+- Support CPU mode for inference. (#2385)
+- Add optimizer constructor for complicated configuration of optimizers. (#2397, #2488)
+- Implement PAFPN. (#2392)
+- Support empty tensor input for some modules. (#2280)
+- Support for custom dataset classes without overriding it. (#2408, #2443)
+- Support to train subsets of coco dataset. (#2340)
+- Add iou_calculator to potentially support more IoU calculation methods. (2405)
+- Support class wise mean AP (was removed in the last version). (#2459)
+- Add option to save the testing result images. (#2414)
+- Support MomentumUpdaterHook. (#2571)
+- Add a demo to inference a single image. (#2605)
+
+### v1.1.0 (24/2/2020)
+
+__Highlights__
+
+- Dataset evaluation is rewritten with a unified api, which is used by both evaluation hooks and test scripts.
+- Support new methods: [CARAFE](https://arxiv.org/abs/1905.02188).
+
+__Breaking Changes__
+
+- The new MMDDP inherits from the official DDP, thus the `__init__` api is changed to be the same as official DDP.
+- The `mask_head` field in HTC config files is modified.
+- The evaluation and testing script is updated.
+- In all transforms, instance masks are stored as a numpy array shaped (n, h, w) instead of a list of (h, w) arrays, where n is the number of instances.
+
+__Bug Fixes__
+
+- Fix IOU assigners when ignore_iof_thr > 0 and there is no pred boxes. (#2135)
+- Fix mAP evaluation when there are no ignored boxes. (#2116)
+- Fix the empty RoI input for Deformable RoI Pooling. (#2099)
+- Fix the dataset settings for multiple workflows. (#2103)
+- Fix the warning related to `torch.uint8` in PyTorch 1.4. (#2105)
+- Fix the inference demo on devices other than gpu:0. (#2098)
+- Fix Dockerfile. (#2097)
+- Fix the bug that `pad_val` is unused in Pad transform. (#2093)
+- Fix the albumentation transform when there is no ground truth bbox. (#2032)
+
+__Improvements__
+
+- Use torch instead of numpy for random sampling. (#2094)
+- Migrate to the new MMDDP implementation in MMCV v0.3. (#2090)
+- Add meta information in logs. (#2086)
+- Rewrite Soft NMS with pytorch extension and remove cython as a dependency. (#2056)
+- Rewrite dataset evaluation. (#2042, #2087, #2114, #2128)
+- Use numpy array for masks in transforms. (#2030)
+
+__New Features__
+
+- Implement "CARAFE: Content-Aware ReAssembly of FEatures". (#1583)
+- Add `worker_init_fn()` in data_loader when seed is set. (#2066, #2111)
+- Add logging utils. (#2035)
+
+### v1.0.0 (30/1/2020)
+
+This release mainly improves the code quality and add more docstrings.
+
+__Highlights__
+
+- Documentation is online now: <https://mmdetection.readthedocs.io>.
+- Support new models: [ATSS](https://arxiv.org/abs/1912.02424).
+- DCN is now available with the api `build_conv_layer` and `ConvModule` like the normal conv layer.
+- A tool to collect environment information is available for trouble shooting.
+
+__Bug Fixes__
+
+- Fix the incompatibility of the latest numpy and pycocotools. (#2024)
+- Fix the case when distributed package is unavailable, e.g., on Windows. (#1985)
+- Fix the dimension issue for `refine_bboxes()`. (#1962)
+- Fix the typo when `seg_prefix` is a list. (#1906)
+- Add segmentation map cropping to RandomCrop. (#1880)
+- Fix the return value of `ga_shape_target_single()`. (#1853)
+- Fix the loaded shape of empty proposals. (#1819)
+- Fix the mask data type when using albumentation. (#1818)
+
+__Improvements__
+
+- Enhance AssignResult and SamplingResult. (#1995)
+- Add ability to overwrite existing module in Registry. (#1982)
+- Reorganize requirements and make albumentations and imagecorruptions optional. (#1969)
+- Check NaN in `SSDHead`. (#1935)
+- Encapsulate the DCN in ResNe(X)t into a ConvModule & Conv_layers. (#1894)
+- Refactoring for mAP evaluation and support multiprocessing and logging. (#1889)
+- Init the root logger before constructing Runner to log more information. (#1865)
+- Split `SegResizeFlipPadRescale` into different existing transforms. (#1852)
+- Move `init_dist()` to MMCV. (#1851)
+- Documentation and docstring improvements. (#1971, #1938, #1869, #1838)
+- Fix the color of the same class for mask visualization. (#1834)
+- Remove the option `keep_all_stages` in HTC and Cascade R-CNN. (#1806)
+
+__New Features__
+
+- Add two test-time options `crop_mask` and `rle_mask_encode` for mask heads. (#2013)
+- Support loading grayscale images as single channel. (#1975)
+- Implement "Bridging the Gap Between Anchor-based and Anchor-free Detection via Adaptive Training Sample Selection". (#1872)
+- Add sphinx generated docs. (#1859, #1864)
+- Add GN support for flops computation. (#1850)
+- Collect env info for trouble shooting. (#1812)
+
+### v1.0rc1 (13/12/2019)
+
+The RC1 release mainly focuses on improving the user experience, and fixing bugs.
+
+__Highlights__
+
+- Support new models: [FoveaBox](https://arxiv.org/abs/1904.03797), [RepPoints](https://arxiv.org/abs/1904.11490) and [FreeAnchor](https://arxiv.org/abs/1909.02466).
+- Add a Dockerfile.
+- Add a jupyter notebook demo and a webcam demo.
+- Setup the code style and CI.
+- Add lots of docstrings and unit tests.
+- Fix lots of bugs.
+
+__Breaking Changes__
+
+- There was a bug for computing COCO-style mAP w.r.t different scales (AP_s, AP_m, AP_l), introduced by #621. (#1679)
+
+__Bug Fixes__
+
+- Fix a sampling interval bug in Libra R-CNN. (#1800)
+- Fix the learning rate in SSD300 WIDER FACE. (#1781)
+- Fix the scaling issue when `keep_ratio=False`. (#1730)
+- Fix typos. (#1721, #1492, #1242, #1108, #1107)
+- Fix the shuffle argument in `build_dataloader`. (#1693)
+- Clip the proposal when computing mask targets. (#1688)
+- Fix the "index out of range" bug for samplers in some corner cases. (#1610, #1404)
+- Fix the NMS issue on devices other than GPU:0. (#1603)
+- Fix SSD Head and GHM Loss on CPU. (#1578)
+- Fix the OOM error when there are too many gt bboxes. (#1575)
+- Fix the wrong keyword argument `nms_cfg` in HTC. (#1573)
+- Process masks and semantic segmentation in Expand and MinIoUCrop transforms. (#1550, #1361)
+- Fix a scale bug in the Non Local op. (#1528)
+- Fix a bug in transforms when `gt_bboxes_ignore` is None. (#1498)
+- Fix a bug when `img_prefix` is None. (#1497)
+- Pass the device argument to `grid_anchors` and `valid_flags`. (#1478)
+- Fix the data pipeline for test_robustness. (#1476)
+- Fix the argument type of deformable pooling. (#1390)
+- Fix the coco_eval when there are only two classes. (#1376)
+- Fix a bug in Modulated DeformableConv when deformable_group>1. (#1359)
+- Fix the mask cropping in RandomCrop. (#1333)
+- Fix zero outputs in DeformConv when not running on cuda:0. (#1326)
+- Fix the type issue in Expand. (#1288)
+- Fix the inference API. (#1255)
+- Fix the inplace operation in Expand. (#1249)
+- Fix the from-scratch training config. (#1196)
+- Fix inplace add in RoIExtractor which cause an error in PyTorch 1.2. (#1160)
+- Fix FCOS when input images has no positive sample. (#1136)
+- Fix recursive imports. (#1099)
+
+__Improvements__
+
+- Print the config file and mmdet version in the log. (#1721)
+- Lint the code before compiling in travis CI. (#1715)
+- Add a probability argument for the `Expand` transform. (#1651)
+- Update the PyTorch and CUDA version in the docker file. (#1615)
+- Raise a warning when specifying `--validate` in non-distributed training. (#1624, #1651)
+- Beautify the mAP printing. (#1614)
+- Add pre-commit hook. (#1536)
+- Add the argument `in_channels` to backbones. (#1475)
+- Add lots of docstrings and unit tests, thanks to [@Erotemic](https://github.com/Erotemic). (#1603, #1517, #1506, #1505, #1491, #1479, #1477, #1475, #1474)
+- Add support for multi-node distributed test when there is no shared storage. (#1399)
+- Optimize Dockerfile to reduce the image size. (#1306)
+- Update new results of HRNet. (#1284, #1182)
+- Add an argument `no_norm_on_lateral` in FPN. (#1240)
+- Test the compiling in CI. (#1235)
+- Move docs to a separate folder. (#1233)
+- Add a jupyter notebook demo. (#1158)
+- Support different type of dataset for training. (#1133)
+- Use int64_t instead of long in cuda kernels. (#1131)
+- Support unsquare RoIs for bbox and mask heads. (#1128)
+- Manually add type promotion to make compatible to PyTorch 1.2. (#1114)
+- Allowing validation dataset for computing validation loss. (#1093)
+- Use `.scalar_type()` instead of `.type()` to suppress some warnings. (#1070)
+
+__New Features__
+
+- Add an option `--with_ap` to compute the AP for each class. (#1549)
+- Implement "FreeAnchor: Learning to Match Anchors for Visual Object Detection". (#1391)
+- Support [Albumentations](https://github.com/albumentations-team/albumentations) for augmentations in the data pipeline. (#1354)
+- Implement "FoveaBox: Beyond Anchor-based Object Detector". (#1339)
+- Support horizontal and vertical flipping. (#1273, #1115)
+- Implement "RepPoints: Point Set Representation for Object Detection". (#1265)
+- Add test-time augmentation to HTC and Cascade R-CNN. (#1251)
+- Add a COCO result analysis tool. (#1228)
+- Add Dockerfile. (#1168)
+- Add a webcam demo. (#1155, #1150)
+- Add FLOPs counter. (#1127)
+- Allow arbitrary layer order for ConvModule. (#1078)
+
+### v1.0rc0 (27/07/2019)
+
+- Implement lots of new methods and components (Mixed Precision Training, HTC, Libra R-CNN, Guided Anchoring, Empirical Attention, Mask Scoring R-CNN, Grid R-CNN (Plus), GHM, GCNet, FCOS, HRNet, Weight Standardization, etc.). Thank all collaborators!
+- Support two additional datasets: WIDER FACE and Cityscapes.
+- Refactoring for loss APIs and make it more flexible to adopt different losses and related hyper-parameters.
+- Speed up multi-gpu testing.
+- Integrate all compiling and installing in a single script.
+
+### v0.6.0 (14/04/2019)
+
+- Up to 30% speedup compared to the model zoo.
+- Support both PyTorch stable and nightly version.
+- Replace NMS and SigmoidFocalLoss with Pytorch CUDA extensions.
+
+### v0.6rc0(06/02/2019)
+
+- Migrate to PyTorch 1.0.
+
+### v0.5.7 (06/02/2019)
+
+- Add support for Deformable ConvNet v2. (Many thanks to the authors and [@chengdazhi](https://github.com/chengdazhi))
+- This is the last release based on PyTorch 0.4.1.
+
+### v0.5.6 (17/01/2019)
+
+- Add support for Group Normalization.
+- Unify RPNHead and single stage heads (RetinaHead, SSDHead) with AnchorHead.
+
+### v0.5.5 (22/12/2018)
+
+- Add SSD for COCO and PASCAL VOC.
+- Add ResNeXt backbones and detection models.
+- Refactoring for Samplers/Assigners and add OHEM.
+- Add VOC dataset and evaluation scripts.
+
+### v0.5.4 (27/11/2018)
+
+- Add SingleStageDetector and RetinaNet.
+
+### v0.5.3 (26/11/2018)
+
+- Add Cascade R-CNN and Cascade Mask R-CNN.
+- Add support for Soft-NMS in config files.
+
+### v0.5.2 (21/10/2018)
+
+- Add support for custom datasets.
+- Add a script to convert PASCAL VOC annotations to the expected format.
+
+### v0.5.1 (20/10/2018)
+
+- Add BBoxAssigner and BBoxSampler, the `train_cfg` field in config files are restructured.
+- `ConvFCRoIHead` / `SharedFCRoIHead` are renamed to `ConvFCBBoxHead` / `SharedFCBBoxHead` for consistency.

docs/en/notes/compatibility.md

+# Compatibility of MMDetection 2.x
+
+## MMDetection 2.25.0
+
+In order to support Mask2Former for instance segmentation, the original config files of Mask2Former for panpotic segmentation need to be renamed [PR #7571](https://github.com/open-mmlab/mmdetection/pull/7571).
+
+<table align="center">
+    <thead>
+        <tr align='center'>
+            <td>before v2.25.0</td>
+            <td>after v2.25.0</td>
+        </tr>
+    </thead>
+    <tbody><tr valign='top'>
+    <th>
+
+```
+'mask2former_xxx_coco.py' represents config files for **panoptic segmentation**.
+```
+
+</th>
+    <th>
+
+```
+'mask2former_xxx_coco.py' represents config files for **instance segmentation**.
+'mask2former_xxx_coco-panoptic.py' represents config files for **panoptic segmentation**.
+```
+
+</th></tr>
+  </tbody></table>
+
+## MMDetection 2.21.0
+
+In order to support CPU training, the logic of scatter in batch collating has been changed. We recommend to use
+MMCV v1.4.4 or higher. For more details, please refer to [MMCV PR #1621](https://github.com/open-mmlab/mmcv/pull/1621).
+
+## MMDetection 2.18.1
+
+### MMCV compatibility
+
+In order to fix the wrong weight reference bug in BaseTransformerLayer, the logic in batch first mode of MultiheadAttention has been changed.
+We recommend to use MMCV v1.3.17 or higher. For more details, please refer to [MMCV PR #1418](https://github.com/open-mmlab/mmcv/pull/1418).
+
+## MMDetection 2.18.0
+
+### DIIHead compatibility
+
+In order to support QueryInst, attn_feats is added into the returned tuple of DIIHead.
+
+## MMDetection 2.14.0
+
+### MMCV Version
+
+In order to fix the problem that the priority of EvalHook is too low, all hook priorities have been re-adjusted in 1.3.8, so MMDetection 2.14.0 needs to rely on the latest MMCV 1.3.8 version. For related information, please refer to [#1120](https://github.com/open-mmlab/mmcv/pull/1120), for related issues, please refer to [#5343](https://github.com/open-mmlab/mmdetection/issues/5343).
+
+### SSD compatibility
+
+In v2.14.0, to make SSD more flexible to use, [PR5291](https://github.com/open-mmlab/mmdetection/pull/5291) refactored its backbone, neck and head. The users can use the script `tools/model_converters/upgrade_ssd_version.py` to convert their models.
+
+```bash
+python tools/model_converters/upgrade_ssd_version.py ${OLD_MODEL_PATH} ${NEW_MODEL_PATH}
+```
+
+- OLD_MODEL_PATH: the path to load the old version SSD model.
+- NEW_MODEL_PATH: the path to save the converted model weights.
+
+## MMDetection 2.12.0
+
+MMDetection is going through big refactoring for more general and convenient usages during the releases from v2.12.0 to v2.18.0 (maybe longer).
+In v2.12.0 MMDetection inevitably brings some BC-breakings, including the MMCV dependency, model initialization, model registry, and mask AP evaluation.
+
+### MMCV Version
+
+MMDetection v2.12.0 relies on the newest features in MMCV 1.3.3, including `BaseModule` for unified parameter initialization, model registry, and the CUDA operator `MultiScaleDeformableAttn` for [Deformable DETR](https://arxiv.org/abs/2010.04159). Note that MMCV 1.3.2 already contains all the features used by MMDet but has known issues. Therefore, we recommend users to skip MMCV v1.3.2 and use v1.3.2, though v1.3.2 might work for most of the cases.
+
+### Unified model initialization
+
+To unify the parameter initialization in OpenMMLab projects, MMCV supports `BaseModule` that accepts `init_cfg` to allow the modules' parameters initialized in a flexible and unified manner. Now the users need to explicitly call `model.init_weights()` in the training script to initialize the model (as in [here](https://github.com/open-mmlab/mmdetection/blob/main/tools/train.py#L162), previously this was handled by the detector. **The downstream projects must update their model initialization accordingly to use MMDetection v2.12.0**. Please refer to PR #4750 for details.
+
+### Unified model registry
+
+To easily use backbones implemented in other OpenMMLab projects, MMDetection v2.12.0 inherits the model registry created in MMCV (#760). In this way, as long as the backbone is supported in an OpenMMLab project and that project also uses the registry in MMCV, users can use that backbone in MMDetection by simply modifying the config without copying the code of that backbone into MMDetection. Please refer to PR #5059 for more details.
+
+### Mask AP evaluation
+
+Before [PR 4898](https://github.com/open-mmlab/mmdetection/pull/4898) and V2.12.0, the mask AP of small, medium, and large instances is calculated based on the bounding box area rather than the real mask area. This leads to higher `APs` and `APm` but lower `APl` but will not affect the overall mask AP. [PR 4898](https://github.com/open-mmlab/mmdetection/pull/4898) change it to use mask areas by deleting `bbox` in mask AP calculation.
+The new calculation does not affect the overall mask AP evaluation and is consistent with [Detectron2](https://github.com/facebookresearch/detectron2/).
+
+## Compatibility with MMDetection 1.x
+
+MMDetection 2.0 goes through a big refactoring and addresses many legacy issues. It is not compatible with the 1.x version, i.e., running inference with the same model weights in these two versions will produce different results. Thus, MMDetection 2.0 re-benchmarks all the models and provides their links and logs in the model zoo.
+
+The major differences are in four folds: coordinate system, codebase conventions, training hyperparameters, and modular design.
+
+### Coordinate System
+
+The new coordinate system is consistent with [Detectron2](https://github.com/facebookresearch/detectron2/) and treats the center of the most left-top pixel as (0, 0) rather than the left-top corner of that pixel.
+Accordingly, the system interprets the coordinates in COCO bounding box and segmentation annotations as coordinates in range `[0, width]` or `[0, height]`.
+This modification affects all the computation related to the bbox and pixel selection,
+which is more natural and accurate.
+
+- The height and width of a box with corners (x1, y1) and (x2, y2) in the new coordinate system is computed as `width = x2 - x1` and `height = y2 - y1`.
+  In MMDetection 1.x and previous version, a "+ 1" was added both height and width.
+  This modification are in three folds:
+
+  1. Box transformation and encoding/decoding in regression.
+  2. IoU calculation. This affects the matching process between ground truth and bounding box and the NMS process. The effect to compatibility is very negligible, though.
+  3. The corners of bounding box is in float type and no longer quantized. This should provide more accurate bounding box results. This also makes the bounding box and RoIs not required to have minimum size of 1, whose effect is small, though.
+
+- The anchors are center-aligned to feature grid points and in float type.
+  In MMDetection 1.x and previous version, the anchors are in `int` type and not center-aligned.
+  This affects the anchor generation in RPN and all the anchor-based methods.
+
+- ROIAlign is better aligned with the image coordinate system. The new implementation is adopted from [Detectron2](https://github.com/facebookresearch/detectron2/tree/master/detectron2/layers/csrc/ROIAlign).
+  The RoIs are shifted by half a pixel by default when they are used to cropping RoI features, compared to MMDetection 1.x.
+  The old behavior is still available by setting `aligned=False` instead of `aligned=True`.
+
+- Mask cropping and pasting are more accurate.
+
+  1. We use the new RoIAlign to crop mask targets. In MMDetection 1.x, the bounding box is quantized before it is used to crop mask target, and the crop process is implemented by numpy. In new implementation, the bounding box for crop is not quantized and sent to RoIAlign. This implementation accelerates the training speed by a large margin (~0.1s per iter, ~2 hour when training Mask R50 for 1x schedule) and should be more accurate.
+
+  2. In MMDetection 2.0, the "`paste_mask()`" function is different and should be more accurate than those in previous versions. This change follows the modification in [Detectron2](https://github.com/facebookresearch/detectron2/blob/master/detectron2/structures/masks.py) and can improve mask AP on COCO by ~0.5% absolute.
+
+### Codebase Conventions
+
+- MMDetection 2.0 changes the order of class labels to reduce unused parameters in regression and mask branch more naturally (without +1 and -1).
+  This effect all the classification layers of the model to have a different ordering of class labels. The final layers of regression branch and mask head no longer keep K+1 channels for K categories, and their class orders are consistent with the classification branch.
+
+  - In MMDetection 2.0, label "K" means background, and labels \[0, K-1\] correspond to the K = num_categories object categories.
+
+  - In MMDetection 1.x and previous version, label "0" means background, and labels \[1, K\] correspond to the K categories.
+
+  - **Note**: The class order of softmax RPN is still the same as that in 1.x in versions\<=2.4.0 while sigmoid RPN is not affected. The class orders in all heads are unified since MMDetection v2.5.0.
+
+- Low quality matching in R-CNN is not used. In MMDetection 1.x and previous versions, the `max_iou_assigner` will match low quality boxes for each ground truth box in both RPN and R-CNN training. We observe this sometimes does not assign the most perfect GT box to some bounding boxes,
+  thus MMDetection 2.0 do not allow low quality matching by default in R-CNN training in the new system. This sometimes may slightly improve the box AP (~0.1% absolute).
+
+- Separate scale factors for width and height. In MMDetection 1.x and previous versions, the scale factor is a single float in mode `keep_ratio=True`. This is slightly inaccurate because the scale factors for width and height have slight difference. MMDetection 2.0 adopts separate scale factors for width and height, the improvement on AP ~0.1% absolute.
+
+- Configs name conventions are changed. MMDetection V2.0 adopts the new name convention to maintain the gradually growing model zoo as the following:
+
+  ```shell
+  [model]_(model setting)_[backbone]_[neck]_(norm setting)_(misc)_(gpu x batch)_[schedule]_[dataset].py,
+  ```
+
+  where the (`misc`) includes DCN and GCBlock, etc. More details are illustrated in the [documentation for config](tutorials/config)
+
+- MMDetection V2.0 uses new ResNet Caffe backbones to reduce warnings when loading pre-trained models. Most of the new backbones' weights are the same as the former ones but do not have `conv.bias`, except that they use a different `img_norm_cfg`. Thus, the new backbone will not cause warning of unexpected keys.
+
+### Training Hyperparameters
+
+The change in training hyperparameters does not affect
+model-level compatibility but slightly improves the performance. The major ones are:
+
+- The number of proposals after nms is changed from 2000 to 1000 by setting `nms_post=1000` and `max_num=1000`.
+  This slightly improves both mask AP and bbox AP by ~0.2% absolute.
+
+- The default box regression losses for Mask R-CNN, Faster R-CNN and RetinaNet are changed from smooth L1 Loss to L1 loss. This leads to an overall improvement in box AP (~0.6% absolute). However, using L1-loss for other methods such as Cascade R-CNN and HTC does not improve the performance, so we keep the original settings for these methods.
+
+- The sample num of RoIAlign layer is set to be 0 for simplicity. This leads to slightly improvement on mask AP (~0.2% absolute).
+
+- The default setting does not use gradient clipping anymore during training for faster training speed. This does not degrade performance of the most of models. For some models such as RepPoints we keep using gradient clipping to stabilize the training process and to obtain better performance.
+
+- The default warmup ratio is changed from 1/3 to 0.001 for a more smooth warming up process since the gradient clipping is usually not used. The effect is found negligible during our re-benchmarking, though.
+
+### Upgrade Models from 1.x to 2.0
+
+To convert the models trained by MMDetection V1.x to MMDetection V2.0, the users can use the script `tools/model_converters/upgrade_model_version.py` to convert
+their models. The converted models can be run in MMDetection V2.0 with slightly dropped performance (less than 1% AP absolute).
+Details can be found in `configs/legacy`.
+
+## pycocotools compatibility
+
+`mmpycocotools` is the OpenMMlab's fork of official `pycocotools`, which works for both MMDetection and Detectron2.
+Before [PR 4939](https://github.com/open-mmlab/mmdetection/pull/4939), since `pycocotools` and `mmpycocotool` have the same package name, if users already installed `pycocotools` (installed Detectron2 first under the same environment), then the setup of MMDetection will skip installing `mmpycocotool`. Thus MMDetection fails due to the missing `mmpycocotools`.
+If MMDetection is installed before Detectron2, they could work under the same environment.
+[PR 4939](https://github.com/open-mmlab/mmdetection/pull/4939) deprecates mmpycocotools in favor of official pycocotools.
+Users may install MMDetection and Detectron2 under the same environment after [PR 4939](https://github.com/open-mmlab/mmdetection/pull/4939), no matter what the installation order is.

docs/en/notes/contribution_guide.md

+# Contribution

docs/en/notes/faq.md

+# Frequently Asked Questions
+
+We list some common troubles faced by many users and their corresponding solutions here. Feel free to enrich the list if you find any frequent issues and have ways to help others to solve them. If the contents here do not cover your issue, please create an issue using the [provided templates](https://github.com/open-mmlab/mmdetection/blob/main/.github/ISSUE_TEMPLATE/error-report.md/) and make sure you fill in all required information in the template.
+
+## PyTorch 2.0 Support
+
+The vast majority of algorithms in MMDetection now support PyTorch 2.0 and its `torch.compile` function. Users only need to install MMDetection 3.0.0rc7 or later versions to enjoy this feature. If any unsupported algorithms are found during use, please feel free to give us feedback. We also welcome contributions from the community to benchmark the speed improvement brought by using the `torch.compile` function.
+
+To enable the `torch.compile` function, simply add `--cfg-options compile=True` after `train.py` or `test.py`. For example, to enable `torch.compile` for RTMDet, you can use the following command:
+
+```shell
+# Single GPU
+python tools/train.py configs/rtmdet/rtmdet_s_8xb32-300e_coco.py  --cfg-options compile=True
+
+# Single node multiple GPUs
+./tools/dist_train.sh configs/rtmdet/rtmdet_s_8xb32-300e_coco.py 8 --cfg-options compile=True
+
+# Single node multiple GPUs + AMP
+./tools/dist_train.sh configs/rtmdet/rtmdet_s_8xb32-300e_coco.py 8 --cfg-options compile=True --amp
+```
+
+It is important to note that PyTorch 2.0's support for dynamic shapes is not yet fully developed. In most object detection algorithms, not only are the input shapes dynamic, but the loss calculation and post-processing parts are also dynamic. This can lead to slower training speeds when using the `torch.compile` function. Therefore, if you wish to enable the `torch.compile` function, you should follow these principles:
+
+1. Input images to the network are fixed shape, not multi-scale
+2. set `torch._dynamo.config.cache_size_limit` parameter. TorchDynamo will convert and cache the Python bytecode, and the compiled functions will be stored in the cache. When the next check finds that the function needs to be recompiled, the function will be recompiled and cached. However, if the number of recompilations exceeds the maximum value set (64), the function will no longer be cached or recompiled. As mentioned above, the loss calculation and post-processing parts of the object detection algorithm are also dynamically calculated, and these functions need to be recompiled every time. Therefore, setting the `torch._dynamo.config.cache_size_limit` parameter to a smaller value can effectively reduce the compilation time
+
+In MMDetection, you can set the `torch._dynamo.config.cache_size_limit` parameter through the environment variable `DYNAMO_CACHE_SIZE_LIMIT`. For example, the command is as follows:
+
+```shell
+# Single GPU
+export DYNAMO_CACHE_SIZE_LIMIT = 4
+python tools/train.py configs/rtmdet/rtmdet_s_8xb32-300e_coco.py  --cfg-options compile=True
+
+# Single node multiple GPUs
+export DYNAMO_CACHE_SIZE_LIMIT = 4
+./tools/dist_train.sh configs/rtmdet/rtmdet_s_8xb32-300e_coco.py 8 --cfg-options compile=True
+```
+
+About the common questions about PyTorch 2.0's dynamo, you can refer to [here](https://pytorch.org/docs/stable/dynamo/faq.html)
+
+## Installation
+
+Compatibility issue between MMCV and MMDetection; "ConvWS is already registered in conv layer"; "AssertionError: MMCV==xxx is used but incompatible. Please install mmcv>=xxx, \<=xxx."
+
+Compatible MMDetection, MMEngine, and MMCV versions are shown as below. Please choose the correct version of MMCV to avoid installation issues.
+
+| MMDetection version |      MMCV version       |     MMEngine version     |
+| :-----------------: | :---------------------: | :----------------------: |
+|        main         |  mmcv>=2.0.0, \<2.2.0   | mmengine>=0.7.1, \<1.0.0 |
+|        3.2.0        |  mmcv>=2.0.0, \<2.2.0   | mmengine>=0.7.1, \<1.0.0 |
+|        3.1.0        |  mmcv>=2.0.0, \<2.1.0   | mmengine>=0.7.1, \<1.0.0 |
+|        3.0.0        |  mmcv>=2.0.0, \<2.1.0   | mmengine>=0.7.1, \<1.0.0 |
+|      3.0.0rc6       | mmcv>=2.0.0rc4, \<2.1.0 | mmengine>=0.6.0, \<1.0.0 |
+|      3.0.0rc5       | mmcv>=2.0.0rc1, \<2.1.0 | mmengine>=0.3.0, \<1.0.0 |
+|      3.0.0rc4       | mmcv>=2.0.0rc1, \<2.1.0 | mmengine>=0.3.0, \<1.0.0 |
+|      3.0.0rc3       | mmcv>=2.0.0rc1, \<2.1.0 | mmengine>=0.3.0, \<1.0.0 |
+|      3.0.0rc2       | mmcv>=2.0.0rc1, \<2.1.0 | mmengine>=0.1.0, \<1.0.0 |
+|      3.0.0rc1       | mmcv>=2.0.0rc1, \<2.1.0 | mmengine>=0.1.0, \<1.0.0 |
+|      3.0.0rc0       | mmcv>=2.0.0rc1, \<2.1.0 | mmengine>=0.1.0, \<1.0.0 |
+
+**Note:**
+
+1. If you want to install mmdet-v2.x, the compatible MMDetection and MMCV versions table can be found at [here](https://mmdetection.readthedocs.io/en/stable/faq.html#installation). Please choose the correct version of MMCV to avoid installation issues.
+2. In MMCV-v2.x, `mmcv-full` is rename to `mmcv`, if you want to install `mmcv` without CUDA ops, you can install `mmcv-lite`.
+
+- "No module named 'mmcv.ops'"; "No module named 'mmcv.\_ext'".
+
+  1. Uninstall existing `mmcv-lite` in the environment using `pip uninstall mmcv-lite`.
+  2. Install `mmcv` following the [installation instruction](https://mmcv.readthedocs.io/en/2.x/get_started/installation.html).
+
+- "Microsoft Visual C++ 14.0 or graeter is required" during installation on Windows.
+
+  This error happens when building the 'pycocotools.\_mask' extension of pycocotools and the environment lacks corresponding C++ compilation dependencies. You need to download it at Microsoft officials [visual-cpp-build-tools](https://visualstudio.microsoft.com/zh-hans/visual-cpp-build-tools/),  select the "Use C ++ Desktop Development" option to install the minimum dependencies, and then reinstall pycocotools.
+
+- Using Albumentations
+
+  If you would like to use `albumentations`, we suggest using `pip install -r requirements/albu.txt` or
+  `pip install -U albumentations --no-binary qudida,albumentations`.
+  If you simply use `pip install albumentations>=0.3.2`, it will install `opencv-python-headless` simultaneously (even though you have already installed `opencv-python`).
+  Please refer to the [official documentation](https://albumentations.ai/docs/getting_started/installation/#note-on-opencv-dependencies) for details.
+
+- ModuleNotFoundError is raised when using some algorithms
+
+  Some extra dependencies are required for Instaboost, Panoptic Segmentation, LVIS dataset, etc. Please note the error message and install corresponding packages, e.g.,
+
+  ```shell
+  # for instaboost
+  pip install instaboostfast
+  # for panoptic segmentation
+  pip install git+https://github.com/cocodataset/panopticapi.git
+  # for LVIS dataset
+  pip install git+https://github.com/lvis-dataset/lvis-api.git
+  ```
+
+## Coding
+
+- Do I need to reinstall mmdet after some code modifications
+
+  If you follow the best practice and install mmdet with `pip install -e .`, any local modifications made to the code will take effect without reinstallation.
+
+- How to develop with multiple MMDetection versions
+
+  You can have multiple folders like mmdet-3.0, mmdet-3.1.
+  When you run the train or test script, it will adopt the mmdet package in the current folder.
+
+  To use the default MMDetection installed in the environment rather than the one you are working with, you can remove the following line in those scripts:
+
+  ```shell
+  PYTHONPATH="$(dirname $0)/..":$PYTHONPATH
+  ```
+
+## PyTorch/CUDA Environment
+
+- "RTX 30 series card fails when building MMCV or MMDet"
+
+  1. Temporary work-around: do `MMCV_WITH_OPS=1 MMCV_CUDA_ARGS='-gencode=arch=compute_80,code=sm_80' pip install -e .`.
+     The common issue is `nvcc fatal : Unsupported gpu architecture 'compute_86'`. This means that the compiler should optimize for sm_86, i.e., nvidia 30 series card, but such optimizations have not been supported by CUDA toolkit 11.0.
+     This work-around modifies the compile flag by adding `MMCV_CUDA_ARGS='-gencode=arch=compute_80,code=sm_80'`, which tells `nvcc` to optimize for **sm_80**, i.e., Nvidia A100. Although A100 is different from the 30 series card, they use similar ampere architecture. This may hurt the performance but it works.
+  2. PyTorch developers have updated that the default compiler flags should be fixed by [pytorch/pytorch#47585](https://github.com/pytorch/pytorch/pull/47585). So using PyTorch-nightly may also be able to solve the problem, though we have not tested it yet.
+
+- "invalid device function" or "no kernel image is available for execution".
+
+  1. Check if your cuda runtime version (under `/usr/local/`), `nvcc --version` and `conda list cudatoolkit` version match.
+  2. Run `python mmdet/utils/collect_env.py` to check whether PyTorch, torchvision, and MMCV are built for the correct GPU architecture.
+     You may need to set `TORCH_CUDA_ARCH_LIST` to reinstall MMCV.
+     The GPU arch table could be found [here](https://docs.nvidia.com/cuda/cuda-compiler-driver-nvcc/index.html#gpu-feature-list),
+     i.e. run `TORCH_CUDA_ARCH_LIST=7.0 pip install mmcv` to build MMCV for Volta GPUs.
+     The compatibility issue could happen when using old GPUS, e.g., Tesla K80 (3.7) on colab.
+  3. Check whether the running environment is the same as that when mmcv/mmdet has compiled.
+     For example, you may compile mmcv using CUDA 10.0 but run it on CUDA 9.0 environments.
+
+- "undefined symbol" or "cannot open xxx.so".
+
+  1. If those symbols are CUDA/C++ symbols (e.g., libcudart.so or GLIBCXX), check whether the CUDA/GCC runtimes are the same as those used for compiling mmcv,
+     i.e. run `python mmdet/utils/collect_env.py` to see if `"MMCV Compiler"`/`"MMCV CUDA Compiler"` is the same as `"GCC"`/`"CUDA_HOME"`.
+  2. If those symbols are PyTorch symbols (e.g., symbols containing caffe, aten, and TH), check whether the PyTorch version is the same as that used for compiling mmcv.
+  3. Run `python mmdet/utils/collect_env.py` to check whether PyTorch, torchvision, and MMCV are built by and running on the same environment.
+
+- setuptools.sandbox.UnpickleableException: DistutilsSetupError("each element of 'ext_modules' option must be an Extension instance or 2-tuple")
+
+  1. If you are using miniconda rather than anaconda, check whether Cython is installed as indicated in [#3379](https://github.com/open-mmlab/mmdetection/issues/3379).
+     You need to manually install Cython first and then run command `pip install -r requirements.txt`.
+  2. You may also need to check the compatibility between the `setuptools`, `Cython`, and `PyTorch` in your environment.
+
+- "Segmentation fault".
+
+  1. Check you GCC version and use GCC 5.4. This usually caused by the incompatibility between PyTorch and the environment (e.g., GCC \< 4.9 for PyTorch). We also recommend the users to avoid using GCC 5.5 because many feedbacks report that GCC 5.5 will cause "segmentation fault" and simply changing it to GCC 5.4 could solve the problem.
+
+  2. Check whether PyTorch is correctly installed and could use CUDA op, e.g. type the following command in your terminal.
+
+     ```shell
+     python -c 'import torch; print(torch.cuda.is_available())'
+     ```
+
+     And see whether they could correctly output results.
+
+  3. If Pytorch is correctly installed, check whether MMCV is correctly installed.
+
+     ```shell
+     python -c 'import mmcv; import mmcv.ops'
+     ```
+
+     If MMCV is correctly installed, then there will be no issue of the above two commands.
+
+  4. If MMCV and Pytorch is correctly installed, you man use `ipdb`, `pdb` to set breakpoints or directly add 'print' in mmdetection code and see which part leads the segmentation fault.
+
+## Training
+
+- "Loss goes Nan"
+
+  1. Check if the dataset annotations are valid: zero-size bounding boxes will cause the regression loss to be Nan due to the commonly used transformation for box regression. Some small size (width or height are smaller than 1) boxes will also cause this problem after data augmentation (e.g., instaboost). So check the data and try to filter out those zero-size boxes and skip some risky augmentations on the small-size boxes when you face the problem.
+  2. Reduce the learning rate: the learning rate might be too large due to some reasons, e.g., change of batch size. You can rescale them to the value that could stably train the model.
+  3. Extend the warmup iterations: some models are sensitive to the learning rate at the start of the training. You can extend the warmup iterations, e.g., change the `warmup_iters` from 500 to 1000 or 2000.
+  4. Add gradient clipping: some models requires gradient clipping to stabilize the training process. The default of `grad_clip` is `None`, you can add gradient clippint to avoid gradients that are too large, i.e., set `optim_wrapper=dict(clip_grad=dict(max_norm=35, norm_type=2))` in your config file.
+
+- "GPU out of memory"
+
+  1. There are some scenarios when there are large amount of ground truth boxes, which may cause OOM during target assignment. You can set `gpu_assign_thr=N` in the config of assigner thus the assigner will calculate box overlaps through CPU when there are more than N GT boxes.
+
+  2. Set `with_cp=True` in the backbone. This uses the sublinear strategy in PyTorch to reduce GPU memory cost in the backbone.
+
+  3. Try mixed precision training using following the examples in `config/fp16`. The `loss_scale` might need further tuning for different models.
+
+  4. Try to use `AvoidCUDAOOM` to avoid GPU out of memory. It will first retry after calling `torch.cuda.empty_cache()`. If it still fails, it will then retry by converting the type of inputs to FP16 format. If it still fails, it will try to copy inputs from GPUs to CPUs to continue computing. Try AvoidOOM in you code to make the code continue to run when GPU memory runs out:
+
+     ```python
+     from mmdet.utils import AvoidCUDAOOM
+
+     output = AvoidCUDAOOM.retry_if_cuda_oom(some_function)(input1, input2)
+     ```
+
+     You can also try `AvoidCUDAOOM` as a decorator to make the code continue to run when GPU memory runs out:
+
+     ```python
+     from mmdet.utils import AvoidCUDAOOM
+
+     @AvoidCUDAOOM.retry_if_cuda_oom
+     def function(*args, **kwargs):
+         ...
+         return xxx
+     ```
+
+- "RuntimeError: Expected to have finished reduction in the prior iteration before starting a new one"
+
+  1. This error indicates that your module has parameters that were not used in producing loss. This phenomenon may be caused by running different branches in your code in DDP mode.
+  2. You can set `find_unused_parameters = True` in the config to solve the above problems, but this will slow down the training speed.
+  3. You can set `detect_anomalous_params = True` in the config or `model_wrapper_cfg = dict(type='MMDistributedDataParallel', detect_anomalous_params=True)` (More details please refer to [MMEngine](https://github.com/open-mmlab/mmengine/blob/main/mmengine/model/wrappers/distributed.py#L91)) to get the name of those unused parameters. Note `detect_anomalous_params = True` will slow down the training speed, so it is recommended for debugging only.
+
+- Save the best model
+
+  It can be turned on by configuring `default_hooks = dict(checkpoint=dict(type='CheckpointHook', interval=1, save_best='auto'),`. In the case of the `auto` parameter, the first key in the returned evaluation result will be used as the basis for selecting the best model. You can also directly set the key in the evaluation result to manually set it, for example, `save_best='coco/bbox_mAP'`.
+
+## Evaluation
+
+- COCO Dataset, AP or AR = -1
+  1. According to the definition of COCO dataset, the small and medium areas in an image are less than 1024 (32\*32), 9216 (96\*96), respectively.
+  2. If the corresponding area has no object, the result of AP and AR will set to -1.
+
+## Model
+
+- `style` in ResNet
+
+  The `style` parameter in ResNet allows either `pytorch` or `caffe` style. It indicates the difference in the Bottleneck module. Bottleneck is a stacking structure of `1x1-3x3-1x1` convolutional layers. In the case of `caffe` mode, the convolution layer with `stride=2` is the first `1x1` convolution, while in `pyorch` mode, it is the second `3x3` convolution has `stride=2`. A sample code is as below:
+
+  ```python
+  if self.style == 'pytorch':
+        self.conv1_stride = 1
+        self.conv2_stride = stride
+  else:
+        self.conv1_stride = stride
+        self.conv2_stride = 1
+  ```
+
+- ResNeXt parameter description
+
+  ResNeXt comes from the paper [`Aggregated Residual Transformations for Deep Neural Networks`](https://arxiv.org/abs/1611.05431). It introduces  group and uses “cardinality” to control the number of groups to achieve a balance between accuracy and complexity. It controls the basic width and grouping parameters of the internal Bottleneck module through two hyperparameters `baseWidth` and `cardinality`. An example configuration name in MMDetection is `mask_rcnn_x101_64x4d_fpn_mstrain-poly_3x_coco.py`, where `mask_rcnn` represents the algorithm using Mask R-CNN, `x101` represents the backbone network using ResNeXt-101, and `64x4d` represents that the bottleneck block has 64 group and each group has basic width of 4.
+
+- `norm_eval` in backbone
+
+  Since the detection model is usually large and the input image resolution is high, this will result in a small batch of the detection model, which will make the variance of the statistics calculated by BatchNorm during the training process very large and not as stable as the statistics obtained during the pre-training of the backbone network . Therefore, the `norm_eval=True` mode is generally used in training, and the BatchNorm statistics in the pre-trained backbone network are directly used. The few algorithms that use large batches are the `norm_eval=False` mode, such as NASFPN. For the backbone network without ImageNet pre-training and the batch is relatively small, you can consider using `SyncBN`.

docs/en/notes/projects.md

+# Projects based on MMDetection
+
+There are many projects built upon MMDetection.
+We list some of them as examples of how to extend MMDetection for your own projects.
+As the page might not be completed, please feel free to create a PR to update this page.
+
+## Projects as an extension
+
+Some projects extend the boundary of MMDetection for deployment or other research fields.
+They reveal the potential of what MMDetection can do. We list several of them as below.
+
+- [OTEDetection](https://github.com/opencv/mmdetection): OpenVINO training extensions for object detection.
+- [MMDetection3d](https://github.com/open-mmlab/mmdetection3d): OpenMMLab's next-generation platform for general 3D object detection.
+
+## Projects of papers
+
+There are also projects released with papers.
+Some of the papers are published in top-tier conferences (CVPR, ICCV, and ECCV), the others are also highly influential.
+To make this list also a reference for the community to develop and compare new object detection algorithms, we list them following the time order of top-tier conferences.
+Methods already supported and maintained by MMDetection are not listed.
+
+- Involution: Inverting the Inherence of Convolution for Visual Recognition, CVPR21. [\[paper\]](https://arxiv.org/abs/2103.06255)[\[github\]](https://github.com/d-li14/involution)
+- Multiple Instance Active Learning for Object Detection, CVPR 2021. [\[paper\]](https://openaccess.thecvf.com/content/CVPR2021/papers/Yuan_Multiple_Instance_Active_Learning_for_Object_Detection_CVPR_2021_paper.pdf)[\[github\]](https://github.com/yuantn/MI-AOD)
+- Adaptive Class Suppression Loss for Long-Tail Object Detection, CVPR 2021. [\[paper\]](https://arxiv.org/abs/2104.00885)[\[github\]](https://github.com/CASIA-IVA-Lab/ACSL)
+- Generalizable Pedestrian Detection: The Elephant In The Room, CVPR2021. [\[paper\]](https://arxiv.org/abs/2003.08799)[\[github\]](https://github.com/hasanirtiza/Pedestron)
+- Group Fisher Pruning for Practical Network Compression, ICML2021. [\[paper\]](https://github.com/jshilong/FisherPruning/blob/main/resources/paper.pdf)[\[github\]](https://github.com/jshilong/FisherPruning)
+- Overcoming Classifier Imbalance for Long-tail Object Detection with Balanced Group Softmax, CVPR2020. [\[paper\]](http://openaccess.thecvf.com/content_CVPR_2020/papers/Li_Overcoming_Classifier_Imbalance_for_Long-Tail_Object_Detection_With_Balanced_Group_CVPR_2020_paper.pdf)[\[github\]](https://github.com/FishYuLi/BalancedGroupSoftmax)
+- Coherent Reconstruction of Multiple Humans from a Single Image, CVPR2020. [\[paper\]](https://jiangwenpl.github.io/multiperson/)[\[github\]](https://github.com/JiangWenPL/multiperson)
+- Look-into-Object: Self-supervised Structure Modeling for Object Recognition, CVPR 2020. [\[paper\]](http://openaccess.thecvf.com/content_CVPR_2020/papers/Zhou_Look-Into-Object_Self-Supervised_Structure_Modeling_for_Object_Recognition_CVPR_2020_paper.pdf)[\[github\]](https://github.com/JDAI-CV/LIO)
+- Video Panoptic Segmentation, CVPR2020. [\[paper\]](https://arxiv.org/abs/2006.11339)[\[github\]](https://github.com/mcahny/vps)
+- D2Det: Towards High Quality Object Detection and Instance Segmentation, CVPR2020. [\[paper\]](http://openaccess.thecvf.com/content_CVPR_2020/html/Cao_D2Det_Towards_High_Quality_Object_Detection_and_Instance_Segmentation_CVPR_2020_paper.html)[\[github\]](https://github.com/JialeCao001/D2Det)
+- CentripetalNet: Pursuing High-quality Keypoint Pairs for Object Detection, CVPR2020. [\[paper\]](https://arxiv.org/abs/2003.09119)[\[github\]](https://github.com/KiveeDong/CentripetalNet)
+- Learning a Unified Sample Weighting Network for Object Detection, CVPR 2020. [\[paper\]](http://openaccess.thecvf.com/content_CVPR_2020/html/Cai_Learning_a_Unified_Sample_Weighting_Network_for_Object_Detection_CVPR_2020_paper.html)[\[github\]](https://github.com/caiqi/sample-weighting-network)
+- Scale-equalizing Pyramid Convolution for Object Detection, CVPR2020. [\[paper\]](https://arxiv.org/abs/2005.03101) [\[github\]](https://github.com/jshilong/SEPC)
+- Revisiting the Sibling Head in Object Detector, CVPR2020. [\[paper\]](https://arxiv.org/abs/2003.07540)[\[github\]](https://github.com/Sense-X/TSD)
+- PolarMask: Single Shot Instance Segmentation with Polar Representation, CVPR2020. [\[paper\]](https://arxiv.org/abs/1909.13226)[\[github\]](https://github.com/xieenze/PolarMask)
+- Hit-Detector: Hierarchical Trinity Architecture Search for Object Detection, CVPR2020. [\[paper\]](https://arxiv.org/abs/2003.11818)[\[github\]](https://github.com/ggjy/HitDet.pytorch)
+- ZeroQ: A Novel Zero Shot Quantization Framework, CVPR2020. [\[paper\]](https://arxiv.org/abs/2001.00281)[\[github\]](https://github.com/amirgholami/ZeroQ)
+- CBNet: A Novel Composite Backbone Network Architecture for Object Detection, AAAI2020. [\[paper\]](https://aaai.org/Papers/AAAI/2020GB/AAAI-LiuY.1833.pdf)[\[github\]](https://github.com/VDIGPKU/CBNet)
+- RDSNet: A New Deep Architecture for Reciprocal Object Detection and Instance Segmentation, AAAI2020. [\[paper\]](https://arxiv.org/abs/1912.05070)[\[github\]](https://github.com/wangsr126/RDSNet)
+- Training-Time-Friendly Network for Real-Time Object Detection, AAAI2020. [\[paper\]](https://arxiv.org/abs/1909.00700)[\[github\]](https://github.com/ZJULearning/ttfnet)
+- Cascade RPN: Delving into High-Quality Region Proposal Network with Adaptive Convolution, NeurIPS 2019. [\[paper\]](https://arxiv.org/abs/1909.06720)[\[github\]](https://github.com/thangvubk/Cascade-RPN)
+- Reasoning R-CNN: Unifying Adaptive Global Reasoning into Large-scale Object Detection, CVPR2019. [\[paper\]](http://openaccess.thecvf.com/content_CVPR_2019/papers/Xu_Reasoning-RCNN_Unifying_Adaptive_Global_Reasoning_Into_Large-Scale_Object_Detection_CVPR_2019_paper.pdf)[\[github\]](https://github.com/chanyn/Reasoning-RCNN)
+- Learning RoI Transformer for Oriented Object Detection in Aerial Images, CVPR2019. [\[paper\]](https://arxiv.org/abs/1812.00155)[\[github\]](https://github.com/dingjiansw101/AerialDetection)
+- SOLO: Segmenting Objects by Locations. [\[paper\]](https://arxiv.org/abs/1912.04488)[\[github\]](https://github.com/WXinlong/SOLO)
+- SOLOv2: Dynamic, Faster and Stronger. [\[paper\]](https://arxiv.org/abs/2003.10152)[\[github\]](https://github.com/WXinlong/SOLO)
+- Dense Peppoints: Representing Visual Objects with Dense Point Sets. [\[paper\]](https://arxiv.org/abs/1912.11473)[\[github\]](https://github.com/justimyhxu/Dense-RepPoints)
+- IterDet: Iterative Scheme for Object Detection in Crowded Environments. [\[paper\]](https://arxiv.org/abs/2005.05708)[\[github\]](https://github.com/saic-vul/iterdet)
+- Cross-Iteration Batch Normalization. [\[paper\]](https://arxiv.org/abs/2002.05712)[\[github\]](https://github.com/Howal/Cross-iterationBatchNorm)
+- A Ranking-based, Balanced Loss Function Unifying Classification and Localisation in Object Detection, NeurIPS2020 [\[paper\]](https://arxiv.org/abs/2009.13592)[\[github\]](https://github.com/kemaloksuz/aLRPLoss)
+- RelationNet++: Bridging Visual Representations for Object Detection via Transformer Decoder, NeurIPS2020 [\[paper\]](https://arxiv.org/abs/2010.15831)[\[github\]](https://github.com/microsoft/RelationNet2)
+- Generalized Focal Loss V2: Learning Reliable Localization Quality Estimation for Dense Object Detection, CVPR2021[\[paper\]](https://arxiv.org/abs/2011.12885)[\[github\]](https://github.com/implus/GFocalV2)
+- Swin Transformer: Hierarchical Vision Transformer using Shifted Windows, ICCV2021[\[paper\]](https://arxiv.org/abs/2103.14030)[\[github\]](https://github.com/SwinTransformer/)
+- Focal Transformer: Focal Self-attention for Local-Global Interactions in Vision Transformers, NeurIPS2021[\[paper\]](https://arxiv.org/abs/2107.00641)[\[github\]](https://github.com/microsoft/Focal-Transformer)
+- End-to-End Semi-Supervised Object Detection with Soft Teacher, ICCV2021[\[paper\]](https://arxiv.org/abs/2106.09018)[\[github\]](https://github.com/microsoft/SoftTeacher)
+- CBNetV2: A Novel Composite Backbone Network Architecture for Object Detection [\[paper\]](http://arxiv.org/abs/2107.00420)[\[github\]](https://github.com/VDIGPKU/CBNetV2)
+- Instances as Queries, ICCV2021 [\[paper\]](https://openaccess.thecvf.com/content/ICCV2021/papers/Fang_Instances_As_Queries_ICCV_2021_paper.pdf)[\[github\]](https://github.com/hustvl/QueryInst)

docs/en/overview.md

+# OVERVIEW
+
+This chapter introduces you to the framework of MMDetection, and provides links to detailed tutorials about MMDetection.
+
+## What is MMDetection
+
+![image](https://user-images.githubusercontent.com/12907710/137271636-56ba1cd2-b110-4812-8221-b4c120320aa9.png)
+
+MMDetection is an object detection toolbox that contains a rich set of object detection, instance segmentation, and panoptic segmentation methods as well as related components and modules, and below is its whole framework:
+
+MMDetection consists of 7 main parts, apis, structures, datasets, models, engine, evaluation and visualization.
+
+- **apis** provides high-level APIs for model inference.
+- **structures** provides data structures like bbox, mask, and DetDataSample.
+- **datasets** supports various dataset for object detection, instance segmentation, and panoptic segmentation.
+  - **transforms** contains a lot of useful data augmentation transforms.
+  - **samplers** defines different data loader sampling strategy.
+- **models** is the most vital part for detectors and contains different components of a detector.
+  - **detectors** defines all of the detection model classes.
+  - **data_preprocessors** is for preprocessing the input data of the model.
+  - **backbones** contains various backbone networks.
+  - **necks** contains various neck components.
+  - **dense_heads** contains various detection heads that perform dense predictions.
+  - **roi_heads** contains various detection heads that predict from RoIs.
+  - **seg_heads** contains various segmentation heads.
+  - **losses** contains various loss functions.
+  - **task_modules** provides modules for detection tasks. E.g. assigners, samplers, box coders, and prior generators.
+  - **layers** provides some basic neural network layers.
+- **engine** is a part for runtime components.
+  - **runner** provides extensions for [MMEngine's runner](https://mmengine.readthedocs.io/en/latest/tutorials/runner.html).
+  - **schedulers** provides schedulers for adjusting optimization hyperparameters.
+  - **optimizers** provides optimizers and optimizer wrappers.
+  - **hooks** provides various hooks of the runner.
+- **evaluation** provides different metrics for evaluating model performance.
+- **visualization** is for visualizing detection results.
+
+## How to Use this Guide
+
+Here is a detailed step-by-step guide to learn more about MMDetection:
+
+1. For installation instructions, please see [get_started](get_started.md).
+
+2. Refer to the below tutorials for the basic usage of MMDetection.
+
+   - [Train and Test](https://mmdetection.readthedocs.io/en/latest/user_guides/index.html#train-test)
+
+   - [Useful Tools](https://mmdetection.readthedocs.io/en/latest/user_guides/index.html#useful-tools)
+
+3. Refer to the below tutorials to dive deeper:
+
+   - [Basic Concepts](https://mmdetection.readthedocs.io/en/latest/advanced_guides/index.html#basic-concepts)
+   - [Component Customization](https://mmdetection.readthedocs.io/en/latest/advanced_guides/index.html#component-customization)
+
+4. For users of MMDetection 2.x version, we provide a guide to help you adapt to the new version. You can find it in the [migration guide](./migration/migration.md).

docs/en/stat.py

+#!/usr/bin/env python
+import functools as func
+import glob
+import os.path as osp
+import re
+
+import numpy as np
+
+url_prefix = 'https://github.com/open-mmlab/mmdetection/blob/main/configs'
+
+files = sorted(glob.glob('../../configs/*/README.md'))
+
+stats = []
+titles = []
+num_ckpts = 0
+
+for f in files:
+    url = osp.dirname(f.replace('../../configs', url_prefix))
+
+    with open(f, 'r') as content_file:
+        content = content_file.read()
+
+    title = content.split('\n')[0].replace('# ', '').strip()
+    ckpts = set(x.lower().strip()
+                for x in re.findall(r'\[model\]\((https?.*)\)', content))
+
+    if len(ckpts) == 0:
+        continue
+
+    _papertype = [x for x in re.findall(r'\[([A-Z]+)\]', content)]
+    assert len(_papertype) > 0
+    papertype = _papertype[0]
+
+    paper = set([(papertype, title)])
+
+    titles.append(title)
+    num_ckpts += len(ckpts)
+
+    statsmsg = f"""
+\t* [{papertype}] [{title}]({url}) ({len(ckpts)} ckpts)
+"""
+    stats.append((paper, ckpts, statsmsg))
+
+allpapers = func.reduce(lambda a, b: a.union(b), [p for p, _, _ in stats])
+msglist = '\n'.join(x for _, _, x in stats)
+
+papertypes, papercounts = np.unique([t for t, _ in allpapers],
+                                    return_counts=True)
+countstr = '\n'.join(
+    [f'   - {t}: {c}' for t, c in zip(papertypes, papercounts)])
+
+modelzoo = f"""
+# Model Zoo Statistics
+
+* Number of papers: {len(set(titles))}
+{countstr}
+
+* Number of checkpoints: {num_ckpts}
+
+{msglist}
+"""
+
+with open('modelzoo_statistics.md', 'w') as f:
+    f.write(modelzoo)