docs: add the docs of nunchaku (#517)

* update sphinx docs

* update the doc configration

* configure doxyfile

* start building the docs

* building docs

* building docs

* update docs

* finish the installation documents

* finish the installation documents

* finish the installation documents

* start using rst

* use rst instead of md

* need to figure out how to maintain rst

* update

* make linter happy

* update

* link management

* rst is hard to handle

* fix the title-only errors

* setup the rst linter

* add the lora files

* lora added, need to be more comprehensive

* update

* update

* finished lora docs

* finished the LoRA docs

* finished the cn docs

* finished the cn docs

* finished the qencoder docs

* finished the cpu offload

* finished the offload docs

* add the attention docs

* finished the attention docs

* finished the fbcache

* update

* finished the pulid docs

* make linter happy

* make linter happy

* add kontext

* update

* add the docs for gradio demos

* add do...

docs/source/installation/installation.rst

+Installation
+============
+
+We provide step-by-step tutorial videos to help you install and use **Nunchaku on Windows**,
+available in both `English <nunchaku_windows_tutorial_en_>`_ and `Chinese <nunchaku_windows_tutorial_zh_>`_.
+You can also follow the corresponding text guide at :doc:`Windows Setup Guide <setup_windows>`.
+If you encounter any issues, these resources are a good place to start.
+
+(Recommended) Option 1: Installing Prebuilt Wheels
+--------------------------------------------------
+
+Prerequisites
+^^^^^^^^^^^^^
+
+Ensure that you have `PyTorch ≥ 2.5 <pytorch_home_>`_ installed. For example, to install **PyTorch 2.7 with CUDA 12.8**, use:
+
+.. code-block:: shell
+
+    pip install torch torchvision torchaudio --index-url https://download.pytorch.org/whl/cu128
+
+Installing Nunchaku
+^^^^^^^^^^^^^^^^^^^
+
+Once PyTorch is installed, you can install ``nunchaku`` from one of the following sources:
+
+- `GitHub Releases <nunchaku_github_releases_>`_
+- `Hugging Face <nunchaku_huggingface_>`_
+- `ModelScope <nunchaku_modelscope_>`_
+
+.. code-block:: shell
+
+    pip install https://github.com/mit-han-lab/nunchaku/releases/download/v0.3.1/nunchaku-0.3.1+torch2.7-cp311-cp311-linux_x86_64.whl
+
+For ComfyUI Users
+^^^^^^^^^^^^^^^^^
+
+If you're using the **ComfyUI portable package**,
+ensure that ``nunchaku`` is installed into the Python environment bundled with ComfyUI. You can either:
+
+- Use our **NunchakuWheelInstaller Node** in `ComfyUI-nunchaku <comfyui_nunchaku_>`_, or
+- Manually install the wheel using the correct Python path.
+
+Option 1: Using NunchakuWheelInstaller
+""""""""""""""""""""""""""""""""""""""
+
+With `ComfyUI-nunchaku <comfyui_nunchaku_>`_ v0.3.2+, you can install Nunchaku using the provided `workflow <comfyui_nunchaku_wheel_installation_workflow_>`_ directly in ComfyUI.
+
+.. image:: https://huggingface.co/mit-han-lab/nunchaku-artifacts/resolve/main/ComfyUI-nunchaku/assets/install_wheel.png
+
+Option 2: Manual Installation
+"""""""""""""""""""""""""""""
+
+To find the correct Python path:
+
+1. Launch ComfyUI.
+2. Check the console log—look for a line like:
+
+   .. code-block:: text
+
+       ** Python executable: G:\ComfyUI\python\python.exe
+
+3. Use that executable to install the wheel manually:
+
+   .. code-block:: bat
+
+       "G:\ComfyUI\python\python.exe" -m pip install <your-wheel-file>.whl
+
+   **Example:** Installing for Python 3.11 and PyTorch 2.7:
+
+   .. code-block:: bat
+
+       "G:\ComfyUI\python\python.exe" -m pip install https://github.com/mit-han-lab/nunchaku/releases/download/v0.3.1/nunchaku-0.3.1+torch2.7-cp311-cp311-linux_x86_64.whl
+
+For Blackwell GPUs (50-series)
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+If you're using a **Blackwell (RTX 50-series)** GPU:
+
+- Use **PyTorch ≥ 2.7** with **CUDA ≥ 12.8**.
+- Use **FP4 models** instead of **INT4 models** for best compatibility and performance.
+
+Option 2: Build from Source
+---------------------------
+
+Requirements
+^^^^^^^^^^^^
+
+- **CUDA version**:
+
+  - Linux: ≥ 12.2
+  - Windows: ≥ 12.6
+  - Blackwell GPUs: CUDA ≥ 12.8 required
+
+- **Compiler**:
+
+  - Linux: ``gcc/g++ >= 11``
+  - Windows: Latest **MSVC** via `Visual Studio <visual_studio_>`_
+
+.. note::
+
+   Currently supported GPU architectures:
+
+   - ``sm_75`` (Turing: RTX 2080)
+   - ``sm_80`` (Ampere: A100)
+   - ``sm_86`` (Ampere: RTX 3090, A6000)
+   - ``sm_89`` (Ada: RTX 4090)
+   - ``sm_120`` (Blackwell: RTX 5090)
+
+Step 1: Set Up Environment
+^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. code-block:: shell
+
+    conda create -n nunchaku python=3.11
+    conda activate nunchaku
+
+    # Install PyTorch
+    pip install torch torchvision torchaudio
+
+    # Install dependencies
+    pip install ninja wheel diffusers transformers accelerate sentencepiece protobuf huggingface_hub
+
+    # Optional: For gradio demos
+    pip install peft opencv-python gradio spaces
+
+For Blackwell users (50-series), install PyTorch ≥ 2.7 with CUDA ≥ 12.8:
+
+.. code-block:: shell
+
+    pip install torch torchvision torchaudio --index-url https://download.pytorch.org/whl/cu128
+
+Step 2: Build and Install Nunchaku
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+**For Linux (if** ``gcc/g++`` **is not recent enough):**
+
+.. code-block:: shell
+
+    conda install -c conda-forge gxx=11 gcc=11
+
+For Windows users, download and install the latest `Visual Studio <visual_studio_>`_ and use its development environment. See :doc:`Window Setup Guide <setup_windows>` for more details.
+
+**Clone and build:**
+
+.. code-block:: shell
+
+    git clone https://github.com/mit-han-lab/nunchaku.git
+    cd nunchaku
+    git submodule init
+    git submodule update
+    python setup.py develop
+
+**To build a wheel for distribution:**
+
+.. code-block:: shell
+
+    NUNCHAKU_INSTALL_MODE=ALL NUNCHAKU_BUILD_WHEELS=1 python -m build --wheel --no-isolation
+
+.. important::
+
+   Set ``NUNCHAKU_INSTALL_MODE=ALL`` to ensure the wheel works on all supported GPU architectures. Otherwise, it may only run on the GPU type used for building.

docs/source/installation/setup_windows.rst

+Windows Setup Guide
+===================
+
+Environment Setup
+-----------------
+
+1. Install Cuda
+^^^^^^^^^^^^^^^^
+
+Download and install the latest CUDA Toolkit from the official `NVIDIA CUDA Downloads <nvidia_cuda_downloads_>`_. After installation, verify the installation:
+
+.. code-block:: bat
+
+   nvcc --version
+
+2. Install Visual Studio C++ Build Tools
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Download from the official `Visual Studio Build Tools page <visual_studio_>`_. During installation, select the following workloads:
+
+- **Desktop development with C++**
+- **C++ tools for Linux development**
+
+3. Install Git
+^^^^^^^^^^^^^^
+
+Download Git from `https://git-scm.com/downloads/win <git_downloads_win_>`_ and follow the installation steps.
+
+4. (Optional) Install Conda
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Conda helps manage Python environments. You can install either Anaconda or Miniconda from the `official site <anaconda_download_>`_.
+
+5. (Optional) Install ComfyUI
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+You may have various ways to install ComfyUI. For example, you can use ComfyUI CLI.
+Once Python is installed, you can install ComfyUI via the CLI:
+
+.. code-block:: bat
+
+   pip install comfy-cli
+   comfy install
+
+To launch ComfyUI:
+
+.. code-block:: bat
+
+   comfy launch
+
+Installing Nunchaku on Windows
+-------------------------------
+
+Step 1: Identify Your Python Environment
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+To ensure correct installation, you need to find the Python interpreter used by ComfyUI.
+Launch ComfyUI and look for this line in the log:
+
+.. code-block:: text
+
+   ** Python executable: G:\ComfyuI\python\python.exe
+
+Then verify the Python version and installed PyTorch version:
+
+.. code-block:: bat
+
+   "G:\ComfyuI\python\python.exe" --version
+   "G:\ComfyuI\python\python.exe" -m pip show torch
+
+Step 2: Install PyTorch (≥2.5) if you haven't
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Install PyTorch appropriate for your setup:
+
+- **For most users**:
+
+  .. code-block:: bat
+
+     "G:\ComfyuI\python\python.exe" -m pip install torch==2.6 torchvision==0.21 torchaudio==2.6
+
+- **For RTX 50-series GPUs** (requires PyTorch ≥2.7 with CUDA 12.8):
+
+  .. code-block:: bat
+
+     "G:\ComfyuI\python\python.exe" -m pip install --pre torch torchvision torchaudio --index-url https://download.pytorch.org/whl/nightly/cu128
+
+Step 3: Install Nunchaku
+^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Option 1: Use NunchakuWheelInstaller Node in ComfyUI
+""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+With `ComfyUI-nunchaku <comfyui_nunchaku_>`_  v0.3.2+, you can install Nunchaku using the provided `workflow <comfyui_nunchaku_wheel_installation_workflow_>`_ directly in ComfyUI.
+
+.. image:: https://huggingface.co/mit-han-lab/nunchaku-artifacts/resolve/main/ComfyUI-nunchaku/assets/install_wheel.png
+
+Option 2: Manually Install Prebuilt Wheels
+"""""""""""""""""""""""""""""""""""""""""""
+
+You can install Nunchaku wheels from one of the following:
+
+- `Hugging Face <nunchaku_huggingface_>`_
+- `ModelScope <nunchaku_modelscope_>`_
+- `GitHub Releases <nunchaku_github_releases_>`_
+
+Example (for Python 3.11 + PyTorch 2.7):
+
+.. code-block:: bat
+
+   "G:\ComfyUI\python\python.exe" -m pip install https://github.com/mit-han-lab/nunchaku/releases/download/v0.3.1/nunchaku-0.3.1+torch2.7-cp311-cp311-linux_x86_64.whl
+
+To verify the installation:
+
+.. code-block:: bat
+
+   "G:\ComfyuI\python\python.exe" -c "import nunchaku"
+
+You can also run a test (requires a Hugging Face token for downloading the models):
+
+.. code-block:: bat
+
+   "G:\ComfyuI\python\python.exe" -m huggingface-cli login
+   "G:\ComfyuI\python\python.exe" -m nunchaku.test
+
+Option 3: Build Nunchaku from Source
+""""""""""""""""""""""""""""""""""""
+
+Please use CMD instead of PowerShell for building.
+
+Step 1: Install Build Tools
+
+.. code-block:: bat
+
+   "G:\ComfyuI\python\python.exe" -m pip install ninja setuptools wheel build
+
+Step 2: Clone the Repository
+
+.. code-block:: bat
+
+   git clone https://github.com/mit-han-lab/nunchaku.git
+   cd nunchaku
+   git submodule init
+   git submodule update
+
+Step 3: Set Up Visual Studio Environment
+
+Locate the ``VsDevCmd.bat`` script on your system. Example path:
+
+.. code-block:: text
+
+   C:\Program Files (x86)\Microsoft Visual Studio\2022\BuildTools\Common7\Tools\VsDevCmd.bat
+
+Then run:
+
+.. code-block:: bat
+
+   "C:\Program Files (x86)\Microsoft Visual Studio\2022\BuildTools\Common7\Tools\VsDevCmd.bat" -startdir=none -arch=x64 -host_arch=x64
+   set DISTUTILS_USE_SDK=1
+
+Step 4: Build Nunchaku
+
+.. code-block:: bat
+
+   "G:\ComfyuI\python\python.exe" setup.py develop
+
+Verify with:
+
+.. code-block:: bat
+
+   "G:\ComfyuI\python\python.exe" -c "import nunchaku"
+
+You can also run a test (requires a Hugging Face token):
+
+.. code-block:: bat
+
+   "G:\ComfyuI\python\python.exe" -m huggingface-cli login
+   "G:\ComfyuI\python\python.exe" -m nunchaku.test
+
+(Optional) Step 5: Building wheel for Portable Python
+
+If building directly with portable Python fails:
+
+.. code-block:: bat
+
+   set NUNCHAKU_INSTALL_MODE=ALL
+   "G:\ComfyuI\python\python.exe" python -m build --wheel --no-isolation
+
+Use Nunchaku in ComfyUI
+-----------------------
+
+1. Install the Plugin
+^^^^^^^^^^^^^^^^^^^^^
+
+Clone the `ComfyUI-nunchaku <comfyui_nunchaku_>`_ plugin into the ``custom_nodes`` folder:
+
+.. code-block:: bat
+
+   cd ComfyUI/custom_nodes
+   git clone https://github.com/mit-han-lab/ComfyUI-nunchaku.git
+
+Alternatively, install it using `ComfyUI-Manager <comfyui_manager_>`_ or ``comfy-cli``.
+
+2. Download Models
+^^^^^^^^^^^^^^^^^^
+
+**Standard FLUX.1-dev Models**
+
+Start by downloading the standard `FLUX.1-dev text encoders <https://huggingface.co/comfyanonymous/flux_text_encoders/tree/main>`__ and `VAE <https://huggingface.co/black-forest-labs/FLUX.1-dev/blob/main/ae.safetensors>`__. You can also optionally download the original `BF16 FLUX.1-dev <https://huggingface.co/black-forest-labs/FLUX.1-dev/blob/main/flux1-dev.safetensors>`__ model. An example command:
+
+.. code-block:: bat
+
+   huggingface-cli download comfyanonymous/flux_text_encoders clip_l.safetensors --local-dir models/text_encoders
+   huggingface-cli download comfyanonymous/flux_text_encoders t5xxl_fp16.safetensors --local-dir models/text_encoders
+   huggingface-cli download black-forest-labs/FLUX.1-schnell ae.safetensors --local-dir models/vae
+   huggingface-cli download black-forest-labs/FLUX.1-dev flux1-dev.safetensors --local-dir models/diffusion_models
+
+**Nunchaku 4-bit FLUX.1-dev Models**
+
+Next, download the Nunchaku 4-bit models to ``models/diffusion_models``:
+
+- For **50-series GPUs**, use the `FP4 model <nunchaku_flux1_dev_fp4_>`_.
+- For **other GPUs**, use the `INT4 model <nunchaku_flux1_dev_int4_>`_.
+
+**(Optional): Download Sample LoRAs**
+
+You can test with some sample LoRAs like `FLUX.1-Turbo <turbo_lora_>`_ and `Ghibsky <ghibsky_lora_>`_. Place these files in the ``models/loras`` directory:
+
+.. code-block:: bat
+
+   huggingface-cli download alimama-creative/FLUX.1-Turbo-Alpha diffusion_pytorch_model.safetensors --local-dir models/loras
+   huggingface-cli download aleksa-codes/flux-ghibsky-illustration lora.safetensors --local-dir models/loras
+
+3. Set Up Workflows
+^^^^^^^^^^^^^^^^^^^
+
+To use the official workflows, download them from the `ComfyUI-nunchaku <comfyui_nunchaku_>`_ and place them in your ``ComfyUI/user/default/workflows`` directory. The command can be:
+
+.. code-block:: bat
+
+   # From the root of your ComfyUI folder
+   cp -r custom_nodes/ComfyUI-nunchaku/example_workflows user/default/workflows/nunchaku_examples
+
+You can now launch ComfyUI and try running the example workflows.

docs/source/links.rst

+.. _svdquant_paper: http://arxiv.org/abs/2411.05007
+.. _deepcompressor_repo: https://github.com/mit-han-lab/deepcompressor
+.. _pytorch_home: https://pytorch.org/
+.. _flux_repo: https://github.com/black-forest-labs/flux
+.. _diffusers_repo: https://github.com/huggingface/diffusers
+.. _nunchaku_github_releases: https://github.com/mit-han-lab/nunchaku/releases
+.. _nunchaku_huggingface: https://huggingface.co/mit-han-lab/nunchaku/tree/main
+.. _nunchaku_modelscope: https://modelscope.cn/models/Lmxyy1999/nunchaku
+.. _comfyui_nunchaku: https://github.com/mit-han-lab/ComfyUI-nunchaku
+.. _comfyui_nunchaku_wheel_installation_workflow: https://github.com/mit-han-lab/ComfyUI-nunchaku/blob/main/example_workflows/install_wheel.json
+.. _comfyui_manager: https://github.com/Comfy-Org/ComfyUI-Manager
+.. _nvidia_cuda_downloads: https://developer.nvidia.com/cuda-downloads
+.. _visual_studio: https://visualstudio.microsoft.com/visual-cpp-build-tools/
+.. _git_downloads_win: https://git-scm.com/downloads/win
+.. _anaconda_download: https://www.anaconda.com/download/success
+.. _nunchaku_windows_tutorial_en: https://youtu.be/YHAVe-oM7U8?si=cM9zaby_aEHiFXk0
+.. _nunchaku_windows_tutorial_zh: https://www.bilibili.com/video/BV1BTocYjEk5/?share_source=copy_web&vd_source=8926212fef622f25cc95380515ac74ee
+.. _nunchaku_repo: https://github.com/mit-han-lab/nunchaku
+.. _ghibsky_lora: https://huggingface.co/aleksa-codes/flux-ghibsky-illustration
+.. _turbo_lora: https://huggingface.co/alimama-creative/FLUX.1-Turbo-Alpha
+.. _nunchaku_flux1_dev_fp4: https://huggingface.co/mit-han-lab/nunchaku-flux.1-dev/blob/main/svdq-fp4_r32-flux.1-dev.safetensors
+.. _nunchaku_flux1_dev_int4: https://huggingface.co/mit-han-lab/nunchaku-flux.1-dev/blob/main/svdq-int4_r32-flux.1-dev.safetensors
+.. _to_diffusers_lora: https://github.com/huggingface/diffusers/blob/main/src/diffusers/models/lora.py#L100
+.. _to_nunchaku_lora: https://github.com/mit-han-lab/nunchaku/blob/main/nunchaku/lora/flux/nunchaku_converter.py#L442
+.. _flux1_tools: https://bfl.ai/announcements/24-11-21-tools
+.. _controlnet_union_pro: https://huggingface.co/Shakker-Labs/FLUX.1-dev-ControlNet-Union-Pro
+.. _controlnet_union_pro2: https://huggingface.co/Shakker-Labs/FLUX.1-dev-ControlNet-Union-Pro-2.0
+.. _fbcache: https://github.com/chengzeyi/ParaAttention?tab=readme-ov-file#first-block-cache-our-dynamic-caching
+.. _pulid_paper: https://arxiv.org/abs/2404.16022
+.. _flux1_kontext_dev: https://huggingface.co/black-forest-labs/FLUX.1-Kontext-dev

docs/source/python_api/nunchaku.caching.diffusers_adapters.flux.rst

+nunchaku.caching.diffusers\_adapters.flux
+=========================================
+
+.. automodule:: nunchaku.caching.diffusers_adapters.flux
+   :members:
+   :undoc-members:
+   :show-inheritance:

docs/source/python_api/nunchaku.caching.diffusers_adapters.rst

+nunchaku.caching.diffusers\_adapters
+====================================
+
+.. automodule:: nunchaku.caching.diffusers_adapters
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
+.. toctree::
+   :maxdepth: 4
+
+   nunchaku.caching.diffusers_adapters.flux
+   nunchaku.caching.diffusers_adapters.sana

docs/source/python_api/nunchaku.caching.diffusers_adapters.sana.rst

+nunchaku.caching.diffusers\_adapters.sana
+=========================================
+
+.. automodule:: nunchaku.caching.diffusers_adapters.sana
+   :members:
+   :undoc-members:
+   :show-inheritance:

docs/source/python_api/nunchaku.caching.rst

+nunchaku.caching
+================
+
+.. toctree::
+   :maxdepth: 4
+
+   nunchaku.caching.diffusers_adapters
+   nunchaku.caching.utils

docs/source/python_api/nunchaku.caching.utils.rst

+nunchaku.caching.utils
+======================
+
+.. automodule:: nunchaku.caching.utils
+   :members:
+   :show-inheritance:

docs/source/python_api/nunchaku.lora.flux.compose.rst

+nunchaku.lora.flux.compose
+==========================
+
+.. automodule:: nunchaku.lora.flux.compose
+   :members:
+   :undoc-members:
+   :show-inheritance:

docs/source/python_api/nunchaku.lora.flux.convert.rst

+nunchaku.lora.flux.convert
+==========================
+
+.. automodule:: nunchaku.lora.flux.convert
+   :members:
+   :undoc-members:
+   :show-inheritance:

docs/source/python_api/nunchaku.lora.flux.diffusers_converter.rst

+nunchaku.lora.flux.diffusers\_converter
+=======================================
+
+.. automodule:: nunchaku.lora.flux.diffusers_converter
+   :members:
+   :undoc-members:
+   :show-inheritance:

docs/source/python_api/nunchaku.lora.flux.nunchaku_converter.rst

+nunchaku.lora.flux.nunchaku\_converter
+======================================
+
+.. automodule:: nunchaku.lora.flux.nunchaku_converter
+   :members:
+   :undoc-members:
+   :show-inheritance:

docs/source/python_api/nunchaku.lora.flux.packer.rst

+nunchaku.lora.flux.packer
+=========================
+
+.. automodule:: nunchaku.lora.flux.packer
+   :members:
+   :show-inheritance:

docs/source/python_api/nunchaku.lora.flux.rst

+nunchaku.lora.flux
+==================
+
+.. toctree::
+   :maxdepth: 4
+
+   nunchaku.lora.flux.diffusers_converter
+   nunchaku.lora.flux.nunchaku_converter
+   nunchaku.lora.flux.compose
+   nunchaku.lora.flux.convert
+   nunchaku.lora.flux.packer
+   nunchaku.lora.flux.utils

docs/source/python_api/nunchaku.lora.flux.utils.rst

+nunchaku.lora.flux.utils
+========================
+
+.. automodule:: nunchaku.lora.flux.utils
+   :members:
+   :undoc-members:
+   :show-inheritance:

docs/source/python_api/nunchaku.lora.rst

+nunchaku.lora
+=============
+
+.. toctree::
+   :maxdepth: 4
+
+   nunchaku.lora.flux

docs/source/python_api/nunchaku.merge_safetensors.rst

+nunchaku.merge\_safetensors
+===========================
+
+.. automodule:: nunchaku.merge_safetensors
+   :members:
+   :undoc-members:
+   :show-inheritance:

docs/source/python_api/nunchaku.models.pulid.encoders_transformer.rst

+nunchaku.models.pulid.encoders\_transformer
+===========================================
+
+.. automodule:: nunchaku.models.pulid.encoders_transformer
+   :members:
+   :undoc-members:
+   :show-inheritance:

docs/source/python_api/nunchaku.models.pulid.pulid_forward.rst

+nunchaku.models.pulid.pulid\_forward
+====================================
+
+.. automodule:: nunchaku.models.pulid.pulid_forward
+   :members:
+   :undoc-members:
+   :show-inheritance:

docs/source/python_api/nunchaku.models.pulid.rst

+nunchaku.models.pulid
+=====================
+
+.. toctree::
+   :maxdepth: 4
+
+   nunchaku.models.pulid.pulid_forward
+   nunchaku.models.pulid.encoders_transformer
+   nunchaku.models.pulid.utils