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.github/workflows/build.yml 0 → 100644
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# This workflow will install Python dependencies, run tests and lint.
# For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions
name: Build
on:
pull_request:
branches:
- main
jobs:
build:
runs-on: ubuntu-latest
strategy:
matrix:
python-version: ['3.10']
steps:
- name: Cancel previous
uses: styfle/cancel-workflow-action@0.8.0
with:
access_token: ${{ github.token }}
- uses: actions/checkout@v2
- name: Set up Python ${{ matrix.python-version }}
uses: actions/setup-python@v1
with:
python-version: ${{ matrix.python-version }}
- name: Install dependencies
run: |
pip install .
pip install .[test]
- name: Run pytest
run: |
pytest vit_jax
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[style]
based_on_style: yapf
\ No newline at end of file
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# How to Contribute
We'd love to accept your patches and contributions to this project. There are
just a few small guidelines you need to follow.
## Contributor License Agreement
Contributions to this project must be accompanied by a Contributor License
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You generally only need to submit a CLA once, so if you've already submitted one
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## Code reviews
All submissions, including submissions by project members, require review. We
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[GitHub Help](https://help.github.com/articles/about-pull-requests/) for more
information on using pull requests.
## Community Guidelines
This project follows
[Google's Open Source Community Guidelines](https://opensource.google/conduct/).
LICENSE 0 → 100644
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# Model Card: LiT (Locked image Tuning)
Last updated: 2022-06-19
Version: 1.0
- This doc: https://github.com/google-research/vision_transformer/blob/main/model_cards/lit.md
- Model Page: https://github.com/google-research/vision_transformer#lit-models
- Other Links:
[LiT Blogpost](https://ai.googleblog.com/2022/04/locked-image-tuning-adding-language.html),
[LiT Paper],
[LiT Demo](https://google-research.github.io/vision_transformer/lit/)
A text/image input model that can be used to embed text/image individually,
and compute similarities between embeddings of text/image pairs. This enables
use cases like zero shot classification, or image/text retrieval.
Note that this model card refers to the models that have been released on
Github specifically (B16B_2, L16L). The [LiT Paper] also evaluates models that
have not been released and use different datasets for training. The Colab
[`lit.ipynb`] lists some more models (L16S, L16Ti) which are similar to L16L,
but with a smaller text tower.
[LiT Paper]: https://arxiv.org/abs/2111.07991
[`lit.ipynb`]: https://colab.research.google.com/github/google-research/vision_transformer/blob/main/lit.ipynb
## Model Summary
- Architecture: Multimodal model with transformer text encoder and transformer
image encoder.
- Inputs: Images presented in 224x224x3 input, text inputs are tokenized and
cropped to the first 16 tokens.
- Outputs: Image and text embeddings (of size 768 or 1024).
- Person of contact: Andreas Steiner (Google Brain)
- Model authors: Xioahua Zhai, Xiao Wang, Basil Mustafa, Andreas Steiner,
Daniel Keysers, Alexander Kolesnikov, Lucas Beyer (Google Brain)
Citation:
```bibtex
@article{zhai2022lit,
title={LiT: Zero-Shot Transfer with Locked-image Text Tuning},
author={Zhai, Xiaohua and Wang, Xiao and Mustafa, Basil and Steiner, Andreas and Keysers, Daniel and Kolesnikov, Alexander and Beyer, Lucas},
journal={CVPR},
year={2022}
}
```
## Model Data
Training data:
- [Pre-trained image-tower](http://arxiv.org/abs/2106.10270) (using the
recommended checkpoints from the paper, Section 4.2)
- [ImageNet-21k](https://www.image-net.org/static_files/papers/imagenet_cvpr09.pdf)
- [BERT](http://arxiv.org/abs/1810.04805) pre-trained text tower
- [BookCorpus](https://github.com/jackbandy/bookcorpus-datasheet)
- English wikipedia
- Multi-modal datasets
- [CC12M](https://arxiv.org/abs/2102.08981)
- [YFCC100M](https://arxiv.org/abs/1503.01817)
Evaluation data (see also section [Evaluation Results](#evaluation-results)
below):
- Zero-shot classification
- [ImageNet](https://www.image-net.org/static_files/papers/imagenet_cvpr09.pdf)
- [ImageNet v2](http://arxiv.org/abs/1902.10811)
- [CIFAR100](https://www.cs.toronto.edu/~kriz/learning-features-2009-TR.pdf)
- [Pets37](https://ieeexplore.ieee.org/abstract/document/6248092)
- [Resisc45](http://arxiv.org/abs/1703.00121)
- Image-text retrieval
- [MS-COCO Captions](https://arxiv.org/abs/1504.00325)
## Model Creation & Maintenance
The model has been initialized from BERT & ViT checkpoints (see details above
"training dataset"), and then contrastively tuned on CC12M and YFCC100M.
All datasets have been released in previous publications independent from this
model. The datasets and model are not regularly updated.
The published B16B_2 and L16L models are medium sized and can be used on a normal
computer, or on a single GPU/TPU.
| Model | B16B_2 | L16L |
| :--- | ---: | ---: |
| Size | 474 MB | 2.4 GB |
| Weights | 196M | 638M |
| Layers | 2x12 | 2x24 |
| Latency (single TPU core) | 1200/sec | 400/sec |
Software/hardware used for training:
- JAX 0.3.13, Flax 0.5.0
- 128 TPUv4 cores
Software/hardware used for deployment:
- JAX 0.3.13, Flax 0.5.0
- CPU/GPU/TPU
Compute requirements for training:
| Model | B16B_2 | L16L |
| :--- | ---: | ---: |
| Number of Chips | 64 | 64 |
| Training Time (days) | 0.3 | 1 |
| Total Computation (FLOPS) | 2.7E+19 | 9E+19 |
| Measured Performance (TFLOPS/s) | 1153 | 1614 |
| Energy Consumption (MWh) | 0.14 | 0.16 |
Compute requirements for inference:
| Model | B16B_2 | L16L |
| :--- | ---: | ---: |
| FLOPS/example | approx. 10 | approx. 30 |
## Evaluation Results
Benchmark information:
- Zero-shot classification (as explained in [CLIP Paper])
- We chose to evaluate a set of datasets that are commonly used, and provide
insights where the model works very well (such as ImageNet v2 or CIFAR100),
as well as where it is much more limited (such as Resisc45).
- Image-text retrieval (Appendix section I.3 in [LiT Paper])
[CLIP Paper]: https://arxiv.org/abs/2103.00020
Evaluation results:
| Model | B16B_2 | L16L |
| :--- | ---: | ---: |
| ImageNet zero-shot | 73.9% | 75.7% |
| ImageNet v2 zero-shot | 65.1% | 66.6% |
| CIFAR100 zero-shot | 79.0% | 80.5% |
| Pets37 zero-shot | 83.3% | 83.3% |
| Resisc45 zero-shot | 25.3% | 25.6% |
| MS-COCO Captions image-to-text retrieval | 51.6% | 48.5% |
| MS-COCO Captions text-to-image retrieval | 31.8% | 31.1% |
## Limitations
Known limitations:
- Any deployment of this model, both for commercial applications and
non-commercial applications, is currently out of scope.
- Before using the model in a constrained (i.e. not deployed) environment, users
should do in-depth testing for their specific use case (e.g. on a constrained
set of class labels of interest).
- These models have only been trained on English text and will fail for most
non-English inputs.
- These models have not been evaluated with respect to their biases and fairness
aspects. We suspect that biases found in the datasets used for training will
be replicated by model representations, and model predictions should a priori
be considered to replicate these biases, with consequences to various fairness
metrics.
Ethical considerations & risks:
- The publication is based on previous work ([CLIP Paper]) that has been shown
(Section 7) to replicate gender biases, perform variably for different groups
of people (by gender, skin color), and cause representational harm in varying
degree for different groups of people (by age, skin color). In the same
section, previous authors have shown that a discriminative image/text model
has the potential to be used in a surveillance context for coarse
classification (although not for fine-grained classification), potentially
lowering the barrier for such problematic use cases.
- These models have not been evaluated for the problems mentioned in previous
work, but until such an evaluation is performed, we expect similar risks.
## Model Usage
Sensitive use: The model has been trained on image datasets containing
pictures of people, both for the pre-training of the image encoder
(ImageNet-21k), and for the contrastive tuning (CC12M and YFCC100M).
The model is used exclusively in research for now:
- [Zero-Shot Text-Guided Object Generation with Dream Fields](https://arxiv.org/abs/2112.01455)
- [Simple Open-Vocabulary Object Detection with Vision Transformers](https://arxiv.org/abs/2205.06230)
## Model Comparison
In comparison with "private data" model from [CLIP Paper]:
- As of 6/10/22, the best published CLIP model is the L/14-336px variant.
- Similar performance (e.g. ImageNet zero-shot classification accuracy:
76.2% CLIP vs. LiT L16L 75.7%)
- LiT is trained solely on publicly available datasets, while CLIP is trained on
a private undisclosed dataset.
- The LiT L16L model is considerably smaller: CLIP uses 576 tokens vs. LiT L16L
uses 196 tokens – since the runtime/memory complexity of attention scales with
the square of the number of tokens, this corresponds to a factor of 8.63x.
In comparison with "public data" model from [CLIP Paper]:
- The only model trained without the private data mentioned in the CLIP paper
(Section D), namely on YFCC100M.
- LiT has much better performance (e.g. ImageNet zero-shot classification
accuracy: 31.3% CLIP vs. LiT L16L 75.7%)
## System Dependencies
Can be used as a stand-alone model (e.g. for zero-shot classification or
retrieval), or as part of a more complex system (basically any system that uses
CLIP as a component can instead use a LiT model).
Pre-processing instructions can be found on Github:
[vit_jax/preprocess.py](https://github.com/google-research/vision_transformer/blob/main/vit_jax/preprocess.py).
The published models include a pre-processing configuration (specifying
tokenizer vocabulary and image pre-processing).
The model outputs image and text embeddings and a temperature. If similarities
are to be computed between image and text embeddings (e.g. for computing output
distributions), then the similarities between the embeddings should be computed
with the dot product, and these should then be multiplied by the temperature
before a softmax is applied.
## Changelog
- 2022-08-16: Replaced model B16B with an updated version B16B_2 that was
trained for 60k steps (before: 30k) without linear head on the image side
(before: 768) and has better performance.
requirements.txt 0 → 100644
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absl-py>=0.12.0
# aqtp!=0.1.1 # https://github.com/google/aqt/issues/196
chex>=0.0.7
clu>=0.0.3
einops>=0.3.0
flax>=0.6.4
git+https://github.com/google/flaxformer
# jax[cuda11_cudnn86]>=0.4.2
#--find-links https://storage.googleapis.com/jax-releases/jax_cuda_releases.html
ml-collections>=0.1.0
numpy>=1.19.5
pandas>=1.1.0
tensorflow-cpu>=2.13.0 # tensorflow-cpu>=2.4.0 # Using tensorflow-cpu to have all GPU memory for JAX.
tensorflow-datasets>=4.0.1
tensorflow-probability>=0.11.1
# tensorflow-text>=2.9.0
# 适配
aqtp==0.1.0
tensorflow-text==2.13.0
scipy==1.12.0
orbax-checkpoint==0.4.1
gsutil
# tensorflow-2.13.1+das1.1.git56b06c8.abi1.dtk2404-cp310-cp310-manylinux_2_31_x86_64.whl
# jax-0.4.23+das1.1.git387bd43.abi1.dtk2404-py3-none-any.whl
# jaxlib-0.4.23+das1.1.git387bd43.abi1.dtk2404-cp310-cp310-manylinux_2_31_x86_64.whl
setup.py 0 → 100644
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# Copyright 2024 Google LLC.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""setup.py for vision_transformer repo, vit_jax package."""
import os
from setuptools import find_packages
from setuptools import setup
here = os.path.abspath(os.path.dirname(__file__))
try:
README = open(os.path.join(here, 'README.md'), encoding='utf-8').read()
except IOError:
README = ''
install_requires = [
'absl-py',
'aqtp!=0.1.1', # https://github.com/google/aqt/issues/196
'clu',
'einops',
'flax',
'flaxformer @ git+https://github.com/google/flaxformer',
'jax',
'ml-collections',
'numpy',
'packaging',
'pandas',
'scipy',
'tensorflow_datasets',
'tensorflow_probability',
'tensorflow',
'tensorflow_text',
'tqdm',
]
tests_require = [
'pytest',
]
__version__ = None
with open(os.path.join(here, 'version.py')) as f:
exec(f.read(), globals()) # pylint: disable=exec-used
setup(
name='vit_jax',
version=__version__,
description='Original JAX implementation of Vision Transformer models.',
long_description=README,
long_description_content_type='text/markdown',
classifiers=[
'Development Status :: 3 - Alpha',
'Intended Audience :: Developers',
'Intended Audience :: Science/Research',
'License :: OSI Approved :: Apache Software License',
'Programming Language :: Python :: 3.7',
'Topic :: Scientific/Engineering :: Artificial Intelligence',
],
keywords='',
author='Vision Transformer Authors',
author_email='no-reply@google.com',
url='https://github.com/google-research/vision_transformer',
packages=find_packages(),
zip_safe=False,
install_requires=install_requires,
tests_require=tests_require,
extras_require=dict(test=tests_require),
)
test.py 0 → 100644
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from vit_jax import checkpoint
from vit_jax import input_pipeline
from vit_jax import utils
from vit_jax import models
from vit_jax import train
from vit_jax.configs import common as common_config
from vit_jax.configs import models as models_config
from absl import logging
import flax
import jax
from matplotlib import pyplot as plt
import numpy as np
import optax
import tqdm
import os
logging.set_verbosity(logging.INFO)
# import PIL
import tensorflow_datasets as tfds
import time
# import tensorflow as tf
'''显示可用设备gpu的数量。'''
from jax.lib import xla_bridge
jax_test=xla_bridge.get_backend().platform
print(jax_test,jax.local_devices())
if not (jax_test=='gpu'):
exit()
model_name = 'ViT-B_16' #@param ["ViT-B_32", "Mixer-B_16"]
# assert os.path.exists(f'./test_result/{model_name}.npz')
'''加载数据集'''
dataset = 'cifar100' # imagenet2012 cifar10 cifar100
batch_size = 512
config = common_config.with_dataset(common_config.get_config(), dataset)
# config.shuffle_buffer=1000
# config.accum_steps=64
config.batch = batch_size
config.pp.crop = 384
# 建立数据集
ds_train = input_pipeline.get_data_from_tfds(config=config, mode='train')
ds_test = input_pipeline.get_data_from_tfds(config=config, mode='test')
num_classes = input_pipeline.get_dataset_info(dataset, 'train')['num_classes']
del config # Only needed to instantiate datasets.
# Fetch a batch of test images for illustration purposes.
batch = next(iter(ds_test.as_numpy_iterator()))
# Note the shape : [num_local_devices, local_batch_size, h, w, c]
print(batch['image'].shape)
exit()
# tf.config.set_visible_devices([], 'GPU')
# print(tf.config.get_visible_devices('GPU'))
'''加载预训练模型'''
model_config = models_config.MODEL_CONFIGS[model_name]
print(model_config)
# 加载模型定义并初始化随机参数。
# 这也将模型编译为XLA(第一次需要几分钟)。
if model_name.startswith('Mixer'):
model = models.MlpMixer(num_classes=num_classes, **model_config)
else:
model = models.VisionTransformer(num_classes=num_classes, **model_config)
variables = jax.jit(lambda: model.init(
jax.random.PRNGKey(0),
# 丢弃用于初始化的批处理的“num_local_devices”维度。
batch['image'][0, :1],
train=False,
), backend='cpu')()
#加载和转换预训练检查点。
# 这涉及到加载实际的预训练模型结果，但也要修改一点参数，例如改变最终层，并调整位置嵌入的大小。有关详细信息，请参阅代码和本文的方法。
params = checkpoint.load_pretrained(
pretrained_path=f'./test_result/{model_name}.npz',
init_params=variables['params'],
model_config=model_config
)
'''评估'''
params_repl = flax.jax_utils.replicate(params)
print('params.cls:', type(params['head']['bias']).__name__,
params['head']['bias'].shape)
print('params_repl.cls:', type(params_repl['head']['bias']).__name__,
params_repl['head']['bias'].shape)
# 然后将调用映射到我们模型的forward pass到所有可用的设备。
vit_apply_repl = jax.pmap(lambda params, inputs: model.apply(
dict(params=params), inputs, train=False))
def get_accuracy(params_repl):
"""返回对测试集求值的精度"""
good = total = 0
steps = input_pipeline.get_dataset_info(dataset, 'test')['num_examples'] // batch_size
for _, batch in zip(tqdm.trange(steps), ds_test.as_numpy_iterator()):
predicted = vit_apply_repl(params_repl, batch['image'])
is_same = predicted.argmax(axis=-1) == batch['label'].argmax(axis=-1)
good += is_same.sum()
total += len(is_same.flatten())
return good / total
# 没有微调的随机性能。
print(get_accuracy(params_repl))
exit()
'''微调'''
# 100 Steps take approximately 15 minutes in the TPU runtime.
total_steps = 50
warmup_steps = 5
decay_type = 'cosine'
grad_norm_clip = 1
# 这控制了批处理被分割的转发次数。8适用于具有8个设备的TPU运行时。64应该可以在GPU上工作。当然，您也可以调整上面的batch_size，但这需要相应地调整学习率。
accum_steps = 64 # TODO:可能要改
base_lr = 0.03
# 检查 train.make_update_fn
lr_fn = utils.create_learning_rate_schedule(total_steps, base_lr, decay_type, warmup_steps)
# 我们使用一个动量优化器，使用一半精度的状态来节省内存。它还实现了梯度裁剪
tx = optax.chain(
optax.clip_by_global_norm(grad_norm_clip),
optax.sgd(
learning_rate=lr_fn,
momentum=0.9,
accumulator_dtype='bfloat16',
),
)
update_fn_repl = train.make_update_fn(
apply_fn=model.apply, accum_steps=accum_steps, tx=tx)
opt_state = tx.init(params)
opt_state_repl = flax.jax_utils.replicate(opt_state)
# Initialize PRNGs for dropout.
update_rng_repl = flax.jax_utils.replicate(jax.random.PRNGKey(0))
# 训练更新
losses = []
lrs = []
# Completes in ~20 min on the TPU runtime.
start = time.time()
for step, batch in zip(
tqdm.trange(1, total_steps + 1),
ds_train.as_numpy_iterator(),
):
params_repl, opt_state_repl, loss_repl, update_rng_repl = update_fn_repl(
params_repl, opt_state_repl, batch, update_rng_repl)
losses.append(loss_repl[0])
lrs.append(lr_fn(step))
end = time.time()
print(f"{model_name}_{dataset}_{total_steps}_{warmup_steps}微调时间为：",end-start)
print(get_accuracy(params_repl))
# 绘制学习率变化曲线并保存
plt.plot(losses)
plt.savefig(f'./test_result/{model_name}_{dataset}/losses_plot.png')
plt.close()
plt.plot(lrs)
plt.savefig(f'./test_result/{model_name}_{dataset}/lrs_plot.png')
plt.close()
# 在CIFAR10上，Mixer-B/16应该是~96.7%，vitb /32应该是97.7%(都是@224)
exit()
# exit()
'''推理'''
# #下载一个预训练的模型
# model_name = 'ViT-L_16'
# model_config = models_config.MODEL_CONFIGS[model_name]
# print(model_config)
# model = models.VisionTransformer(num_classes=1000, **model_config)
# assert os.path.exists(f'./test_result/{model_name}_imagenet2012.npz')
# # 加载和转换预训练的检查点
# params = checkpoint.load(f'./test_result/{model_name}_imagenet2012.npz')
# params['pre_logits'] = {} # Need to restore empty leaf for Flax.
# # 获取图像标签.
# # get_ipython().system('wget https://storage.googleapis.com/bit_models/ilsvrc2012_wordnet_lemmas.txt')
# imagenet_labels = dict(enumerate(open('./test_result/ilsvrc2012_wordnet_lemmas.txt')))
# # 得到一张具有正确尺寸的随机图片
# # resolution = 224 if model_name.startswith('Mixer') else 384
# # get_ipython().system('wget https://picsum.photos/$resolution -O picsum.jpg')
# img = PIL.Image.open('./test_result/picsum.jpg')
# # 预测单个项目的批处理(注意非常高效的TPU使用…)
# logits, = model.apply(dict(params=params), (np.array(img) / 128 - 1)[None, ...], train=False)
# preds = np.array(jax.nn.softmax(logits))
# for idx in preds.argsort()[:-11:-1]:
# print(f'{preds[idx]:.5f} : {imagenet_labels[idx]}', end='')
\ No newline at end of file
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export HIP_VISIBLE_DEVICES=4 # 配置GPU/dcu训练，指定"编码"（多个即多GPU/dcu）
export USE_MIOPEN_BATCHNORM=1 # 启用MIOPEN库的批归一化优化，用于加快训练速度？
# 指定存储模型的位置
# 用于微调的模型/数据集
# 预训练模型的位置
# 累加梯度（tpu=8,cpu=64）
# 微调轮次
# 学习率衰减轮次
# 训练批次
# 图像块的分辨率
# 精度
for model_datasets in 'b16,cifar10' 'b16,cifar100' 'l16,cifar10' 'l16,cifar100'
do
python -m vit_jax.main --workdir=$(pwd)/test_result/dcu/vit-$(date +%s) \
--config=$(pwd)/vit_jax/configs/vit.py:$model_datasets \
--config.pretrained_dir=$(pwd)/test_result \
--config.accum_steps=64 \
--config.total_steps=500 \
--config.warmup_steps=50 \
--config.batch=512 \
--config.pp.crop=384 \
--config.optim_dtype='bfloat16'
done
\ No newline at end of file
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# Copyright 2024 Google LLC.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Current vision_transformer version at head on Github."""
__version__ = "0.0.8"
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This diff is collapsed.
vit_jax/__init__.py 0 → 100644
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# Copyright 2024 Google LLC.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
vit_jax/checkpoint.py 0 → 100644
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# Copyright 2024 Google LLC.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import collections
from collections import abc
import re
from absl import logging
import flax
from flax.training import checkpoints
import jax.numpy as jnp
import numpy as np
from packaging import version
import pandas as pd
import scipy.ndimage
from tensorflow.io import gfile # pylint: disable=import-error
import tqdm
def _flatten_dict(d, parent_key='', sep='/'):
"""Flattens a dictionary, keeping empty leaves."""
items = []
for k, v in d.items():
path = parent_key + sep + k if parent_key else k
if isinstance(v, abc.Mapping):
items.extend(_flatten_dict(v, path, sep=sep).items())
else:
items.append((path, v))
# Keeps the empty dict if it was set explicitly.
if parent_key and not d:
items.append((parent_key, {}))
return dict(items)
def inspect_params(*,
params,
expected,
fail_if_extra=True,
fail_if_missing=True):
"""Inspects whether the params are consistent with the expected keys."""
params_flat = _flatten_dict(params)
expected_flat = _flatten_dict(expected)
missing_keys = expected_flat.keys() - params_flat.keys()
extra_keys = params_flat.keys() - expected_flat.keys()
# Adds back empty dict explicitly, to support layers without weights.
# Context: FLAX ignores empty dict during serialization.
empty_keys = set()
for k in missing_keys:
if isinstance(expected_flat[k], dict) and not expected_flat[k]:
params[k] = {}
empty_keys.add(k)
missing_keys -= empty_keys
if empty_keys:
logging.warning('Inspect recovered empty keys:\n%s', empty_keys)
if missing_keys:
logging.info('Inspect missing keys:\n%s', missing_keys)
if extra_keys:
logging.info('Inspect extra keys:\n%s', extra_keys)
if (missing_keys and fail_if_missing) or (extra_keys and fail_if_extra):
raise ValueError(f'Missing params from checkpoint: {missing_keys}.\n'
f'Extra params in checkpoint: {extra_keys}.\n'
f'Restored params from checkpoint: {params_flat.keys()}.\n'
f'Expected params from code: {expected_flat.keys()}.')
return params
def recover_tree(keys, values):
"""Recovers a tree as a nested dict from flat names and values.
This function is useful to analyze checkpoints that are without need to access
the exact source code of the experiment. In particular, it can be used to
extract an reuse various subtrees of the scheckpoint, e.g. subtree of
parameters.
Args:
keys: a list of keys, where '/' is used as separator between nodes.
values: a list of leaf values.
Returns:
A nested tree-like dict.
"""
tree = {}
sub_trees = collections.defaultdict(list)
for k, v in zip(keys, values):
if '/' not in k:
tree[k] = v
else:
k_left, k_right = k.split('/', 1)
sub_trees[k_left].append((k_right, v))
for k, kv_pairs in sub_trees.items():
k_subtree, v_subtree = zip(*kv_pairs)
tree[k] = recover_tree(k_subtree, v_subtree)
return tree
def copy(src, dst, progress=True, block_size=1024 * 1024 * 10):
"""Copies a file with progress bar.
Args:
src: Source file. Path must be readable by `tf.io.gfile`.
dst: Destination file. Path must be readable by `tf.io.gfile`.
progress: Whether to show a progres bar.
block_size: Size of individual blocks to be read/written.
"""
stats = gfile.stat(src)
n = int(np.ceil(stats.length / block_size))
range_or_trange = tqdm.trange if progress else range
with gfile.GFile(src, 'rb') as fin:
with gfile.GFile(dst, 'wb') as fout:
for _ in range_or_trange(n):
fout.write(fin.read(block_size))
def load(path):
"""Loads params from a checkpoint previously stored with `save()`."""
with gfile.GFile(path, 'rb') as f:
ckpt_dict = np.load(f, allow_pickle=False)
keys, values = zip(*list(ckpt_dict.items()))
params = checkpoints.convert_pre_linen(recover_tree(keys, values))
if isinstance(params, flax.core.FrozenDict):
params = params.unfreeze()
if version.parse(flax.__version__) >= version.parse('0.3.6'):
params = _fix_groupnorm(params)
return params
def _fix_groupnorm(params):
# See https://github.com/google/flax/issues/1721
regex = re.compile(r'gn(\d+|_root|_proj)$')
def fix_gn(args):
path, array = args
if len(path) > 1 and regex.match(
path[-2]) and path[-1] in ('bias', 'scale'):
array = array.squeeze()
return (path, array)
return flax.traverse_util.unflatten_dict(
dict(map(fix_gn,
flax.traverse_util.flatten_dict(params).items())))
def load_pretrained(*, pretrained_path, init_params, model_config):
"""加载/转换一个预训练的检查点进行微调
Args:
pretrained_path: File pointing to pretrained checkpoint.
init_params: Parameters from model. Will be used for the head of the model
and to verify that the model is compatible with the stored checkpoint.
model_config: Configuration of the model. Will be used to configure the head
and rescale the position embeddings.
Returns:
Parameters like `init_params`, but loaded with pretrained weights from
`pretrained_path` and adapted accordingly.
"""
restored_params = inspect_params(
params=load(pretrained_path),
expected=init_params,
fail_if_extra=False,
fail_if_missing=False)
# The following allows implementing fine-tuning head variants depending on the
# value of `representation_size` in the fine-tuning job:
# - `None` : drop the whole head and attach a nn.Linear.
# - same number as in pre-training means : keep the head but reset the last
# layer (logits) for the new task.
if model_config.get('representation_size') is None:
if 'pre_logits' in restored_params:
logging.info('load_pretrained: drop-head variant')
restored_params['pre_logits'] = {}
restored_params['head']['kernel'] = init_params['head']['kernel']
restored_params['head']['bias'] = init_params['head']['bias']
if 'posembed_input' in restored_params.get('Transformer', {}):
# Rescale the grid of position embeddings. Param shape is (1,N,1024)
posemb = restored_params['Transformer']['posembed_input']['pos_embedding']
posemb_new = init_params['Transformer']['posembed_input']['pos_embedding']
if posemb.shape != posemb_new.shape:
logging.info('load_pretrained: resized variant: %s to %s', posemb.shape,
posemb_new.shape)
posemb = interpolate_posembed(
posemb, posemb_new.shape[1], model_config.classifier == 'token')
restored_params['Transformer']['posembed_input']['pos_embedding'] = posemb
if version.parse(flax.__version__) >= version.parse('0.3.6'):
restored_params = _fix_groupnorm(restored_params)
return flax.core.freeze(restored_params)
def interpolate_posembed(posemb, num_tokens: int, has_class_token: bool):
"""Interpolate given positional embedding parameters into a new shape.
Args:
posemb: positional embedding parameters.
num_tokens: desired number of tokens.
has_class_token: True if the positional embedding parameters contain a
class token.
Returns:
Positional embedding parameters interpolated into the new shape.
"""
assert posemb.shape[0] == 1
if has_class_token:
posemb_tok, posemb_grid = posemb[:, :1], posemb[0, 1:]
num_tokens -= 1
else:
posemb_tok, posemb_grid = posemb[:, :0], posemb[0, 0:]
gs_old = int(np.sqrt(len(posemb_grid)))
gs_new = int(np.sqrt(num_tokens))
logging.info('interpolate_posembed: grid-size from %s to %s', gs_old, gs_new)
assert gs_old ** 2 == len(posemb_grid), f'{gs_old ** 2} != {len(posemb_grid)}'
assert gs_new ** 2 == num_tokens, f'{gs_new ** 2} != {num_tokens}'
posemb_grid = posemb_grid.reshape(gs_old, gs_old, -1)
zoom = (gs_new / gs_old, gs_new / gs_old, 1)
posemb_grid = scipy.ndimage.zoom(posemb_grid, zoom, order=1)
posemb_grid = posemb_grid.reshape(1, gs_new * gs_new, -1)
return jnp.array(np.concatenate([posemb_tok, posemb_grid], axis=1))
def get_augreg_df(directory='gs://vit_models/augreg'):
"""Reads DataFrame describing AugReg models from GCS bucket.
This function returns a dataframe that describes the models that were
published as part of the paper "How to train your ViT? Data, Augmentation, and
Regularization in Vision Transformers" (https://arxiv.org/abs/TODO).
Note that every row in the dataset corresponds to a pre-training checkpoint
(column "filename"), and a fine-tuning checkpoint (column "adapt_filename").
Every pre-trained checkpoint is fine-tuned many times.
Args:
directory: Pathname of directory containing "index.csv"
Returns:
Dataframe with the following columns:
- name: Name of the model, as used in descriptions in paper (e.g. "B/16",
or "R26+S/32").
- ds: Dataset used for pre-training: "i1k" (300 epochs), "i21k" (300
epochs), and "i21k_30" (30 epochs).
- lr: Learning rate used for pre-training.
- aug: Data augmentation used for pre-training. Refer to paper for
details.
- wd: Weight decay used for pre-training.
- do: Dropout used for pre-training.
- sd: Stochastic depth used for pre-training.
- best_val: Best accuracy on validation set that was reached during the
pre-training. Note that "validation set" can refer to minival (meaning
split from training set, as for example for "imagenet2012" dataset).
- final_val: Final validation set accuracy.
- final_test: Final testset accuracy (in cases where there is no official
testset, like for "imagenet2012", this refers to the validation set).
- adapt_ds: What dataset was used for fine-tuning.
- adapt_lr: Learning rate used for fine-tuning.
- adapt_steps: Number of steps used for fine-tuning (with a fixed batch
size of 512).
- adapt_resolution: Resolution that was used for fine-tuning.
- adapt_final_val: Final validation accuracy after fine-tuning.
- adapt_final_test: Final test accuracy after fine-tuning.
- params: Number of parameters.
- infer_samples_per_sec: Numbers of sample per seconds during inference on
a V100 GPU (measured with `timm` implementation).
- filename: Name of the pre-training checkpoint. Can be found at
"gs://vit_models/augreg/{filename}.npz".
- adapt_filename: Name of the fine-tuning checkpoint.
"""
with gfile.GFile(f'{directory}/index.csv') as f:
return pd.read_csv(f)
vit_jax/checkpoint_test.py 0 → 100644
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# Copyright 2024 Google LLC.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import tempfile
from absl.testing import absltest
import jax
import jax.numpy as jnp
from vit_jax import checkpoint
from vit_jax import models
from vit_jax import test_utils
from vit_jax.configs import models as config_lib
class CheckpointTest(absltest.TestCase):
def test_load_pretrained(self):
tempdir = tempfile.gettempdir()
model_config = config_lib.get_testing_config()
test_utils.create_checkpoint(model_config, f'{tempdir}/testing.npz')
model = models.VisionTransformer(num_classes=2, **model_config)
variables = model.init(
jax.random.PRNGKey(0),
inputs=jnp.ones([1, 32, 32, 3], jnp.float32),
train=False,
)
checkpoint.load_pretrained(
pretrained_path=f'{tempdir}/testing.npz',
init_params=variables['params'],
model_config=model_config)
if __name__ == '__main__':
absltest.main()
vit_jax/configs/README.md 0 → 100644
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# Configs
This directory contains `ml_collections.ConfigDict` configurations. It is
structured in a way that factors out common configuration parameters into
`common.py` and model configurations into `models.py`.
To select one of these configurations you can specify it on the command line:
```sh
python -m vit_jax.main --config=$(pwd)/vit_jax/configs/vit.py:b32,cifar10
```
The above example specifies the additional parameter `b32,cifar10` that is
parsed in the file `vit.py` and parametrizes the configuration.
Note that you can override any configuration parameters at the command line by
specifying additional parameters like `--config.accumulation_steps=1`.
vit_jax/configs/__init__.py 0 → 100644
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# Copyright 2024 Google LLC.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
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