[Docs] More docs update (#394)

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William Lin
2025-05-11 16:19:47 -07:00
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(add-pipeline)=
# 🏗️ Adding a New Pipeline
This guide explains how to implement a custom diffusion pipeline in FastVideo, leveraging the framework's modular architecture for high-performance video generation.
## Implementation Process Overview
1. **Port Required Modules** - Identify and implement necessary model components
2. **Create Directory Structure** - Set up pipeline files and folders
3. **Implement Pipeline Class** - Build the pipeline using existing or custom stages
4. **Register Your Pipeline** - Make it discoverable by the framework
5. **Configure Your Pipeline** - (Coming soon)
Need help? Join our [Slack community](https://join.slack.com/t/fastvideo/shared_invite/zt-2zf6ru791-sRwI9lPIUJQq1mIeB_yjJg).
## Step 1: Pipeline Modules
### Identifying Required Modules
FastVideo uses the Hugging Face Diffusers format for model organization:
1. Examine the `model_index.json` in the HF model repository:
```json
{
"_class_name": "WanImageToVideoPipeline",
"_diffusers_version": "0.33.0.dev0",
"image_encoder": ["transformers", "CLIPVisionModelWithProjection"],
"image_processor": ["transformers", "CLIPImageProcessor"],
"scheduler": ["diffusers", "UniPCMultistepScheduler"],
"text_encoder": ["transformers", "UMT5EncoderModel"],
"tokenizer": ["transformers", "T5TokenizerFast"],
"transformer": ["diffusers", "WanTransformer3DModel"],
"vae": ["diffusers", "AutoencoderKLWan"]
}
```
1. For each component:
- Note the originating library (`transformers` or `diffusers`)
- Identify the class name
- Check if it's already available in FastVideo
2. Review config files in each component's directory for architecture details
### Implementing Modules
Place new modules in the appropriate directories:
- Encoders: `fastvideo/v1/models/encoders/`
- VAEs: `fastvideo/v1/models/vaes/`
- Transformer models: `fastvideo/v1/models/dits/`
- Schedulers: `fastvideo/v1/models/schedulers/`
### Adapting Model Layers
#### Layer Replacements
Replace standard PyTorch layers with FastVideo optimized versions:
- nn.LayerNorm → fastvideo.v1.layers.layernorm.RMSNorm
- Embedding layers → fastvideo.v1.layers.vocab_parallel_embedding modules
- Activation functions → versions from fastvideo.v1.layers.activation
#### Distributed Linear Layers
Use appropriate parallel layers for distribution:
```python
# Output dimension parallelism
from fastvideo.v1.layers.linear import ColumnParallelLinear
self.q_proj = ColumnParallelLinear(
input_size=hidden_size,
output_size=head_size * num_heads,
bias=bias,
gather_output=False
)
# Fused QKV projection
from fastvideo.v1.layers.linear import QKVParallelLinear
self.qkv_proj = QKVParallelLinear(
hidden_size=hidden_size,
head_size=attention_head_dim,
total_num_heads=num_attention_heads,
bias=True
)
# Input dimension parallelism
from fastvideo.v1.layers.linear import RowParallelLinear
self.out_proj = RowParallelLinear(
input_size=head_size * num_heads,
output_size=hidden_size,
bias=bias,
input_is_parallel=True
)
```
### Attention Layers
Replace standard attention with FastVideo's optimized attention:
```python
# Local attention patterns
from fastvideo.v1.attention import LocalAttention
from fastvideo.v1.attention.backends.abstract import _Backend
self.attn = LocalAttention(
num_heads=num_heads,
head_size=head_dim,
dropout_rate=0.0,
softmax_scale=None,
causal=False,
supported_attention_backends=(_Backend.FLASH_ATTN, _Backend.TORCH_SDPA)
)
# Distributed attention for long sequences
from fastvideo.v1.attention import DistributedAttention
self.attn = DistributedAttention(
num_heads=num_heads,
head_size=head_dim,
dropout_rate=0.0,
softmax_scale=None,
causal=False,
supported_attention_backends=(_Backend.SLIDING_TILE_ATTN, _Backend.FLASH_ATTN, _Backend.TORCH_SDPA)
)
```
#### Define supported backend selection
```python
_supported_attention_backends = (_Backend.FLASH_ATTN, _Backend.TORCH_SDPA)
```
### Registering Models
Register implemented modules in the model registry:
```python
# In fastvideo/v1/models/registry.py
_TEXT_TO_VIDEO_DIT_MODELS = {
"YourTransformerModel": ("dits", "yourmodule", "YourTransformerClass"),
}
_VAE_MODELS = {
"YourVAEModel": ("vaes", "yourvae", "YourVAEClass"),
}
```
## Step 2: Directory Structure
Create a new directory for your pipeline:
```
fastvideo/v1/pipelines/
├── your_pipeline/
│ ├── __init__.py
│ └── your_pipeline.py
```
## Step 3: Implement Pipeline Class
Pipelines are composed of stages, each handling a specific part of the diffusion process:
- **InputValidationStage**: Validates input parameters
- **Text Encoding Stages**: Handle text encoding (CLIP/Llama/T5)
- **CLIPImageEncodingStage**: Processes image inputs
- **TimestepPreparationStage**: Prepares diffusion timesteps
- **LatentPreparationStage**: Manages latent representations
- **ConditioningStage**: Processes conditioning inputs
- **DenoisingStage**: Performs denoising diffusion
- **DecodingStage**: Converts latents to pixels
### Creating Your Pipeline
```python
from fastvideo.v1.pipelines.composed_pipeline_base import ComposedPipelineBase
from fastvideo.v1.pipelines.stages import (
InputValidationStage, CLIPTextEncodingStage, TimestepPreparationStage,
LatentPreparationStage, DenoisingStage, DecodingStage
)
from fastvideo.v1.fastvideo_args import FastVideoArgs
from fastvideo.v1.pipelines.pipeline_batch_info import ForwardBatch
import torch
class MyCustomPipeline(ComposedPipelineBase):
"""Custom diffusion pipeline implementation."""
# Define required model components from model_index.json
_required_config_modules = [
"text_encoder", "tokenizer", "vae", "transformer", "scheduler"
]
@property
def required_config_modules(self) -> List[str]:
return self._required_config_modules
def initialize_pipeline(self, fastvideo_args: FastVideoArgs):
"""Initialize pipeline-specific components."""
pass
def create_pipeline_stages(self, fastvideo_args: FastVideoArgs):
"""Set up pipeline stages with proper dependency injection."""
self.add_stage(
stage_name="input_validation_stage",
stage=InputValidationStage()
)
self.add_stage(
stage_name="prompt_encoding_stage",
stage=CLIPTextEncodingStage(
text_encoder=self.get_module("text_encoder"),
tokenizer=self.get_module("tokenizer")
)
)
self.add_stage(
stage_name="timestep_preparation_stage",
stage=TimestepPreparationStage(
scheduler=self.get_module("scheduler")
)
)
self.add_stage(
stage_name="latent_preparation_stage",
stage=LatentPreparationStage(
scheduler=self.get_module("scheduler"),
vae=self.get_module("vae")
)
)
self.add_stage(
stage_name="denoising_stage",
stage=DenoisingStage(
transformer=self.get_module("transformer"),
scheduler=self.get_module("scheduler")
)
)
self.add_stage(
stage_name="decoding_stage",
stage=DecodingStage(
vae=self.get_module("vae")
)
)
# Register the pipeline class
EntryClass = MyCustomPipeline
```
### Creating Custom Stages (Optional)
If existing stages don't meet your needs, create custom ones:
```python
from fastvideo.v1.pipelines.stages.base import PipelineStage
class MyCustomStage(PipelineStage):
"""Custom processing stage for the pipeline."""
def __init__(self, custom_module, other_param=None):
super().__init__()
self.custom_module = custom_module
self.other_param = other_param
def forward(self, batch: ForwardBatch, fastvideo_args: FastVideoArgs) -> ForwardBatch:
# Access input data
input_data = batch.some_attribute
# Validate inputs
if input_data is None:
raise ValueError("Required input is missing")
# Process with your module
result = self.custom_module(input_data)
# Update batch with results
batch.some_output = result
return batch
```
Add your custom stage to the pipeline:
```python
self.add_stage(
stage_name="my_custom_stage",
stage=MyCustomStage(
custom_module=self.get_module("custom_module"),
other_param="some_value"
)
)
```
#### Stage Design Principles
1. **Single Responsibility**: Focus on one specific task
2. **Functional Pattern**: Receive and return a `ForwardBatch` object
3. **Dependency Injection**: Pass dependencies through constructor
4. **Input Validation**: Validate inputs for clear error messages
## Step 4: Register Your Pipeline
Define `EntryClass` at the end of your pipeline file:
```python
# Single pipeline class
EntryClass = MyCustomPipeline
# Or multiple pipeline classes
EntryClass = [MyCustomPipeline, MyOtherPipeline]
```
The registry will automatically:
1. Scan all packages under `fastvideo/v1/pipelines/`
2. Look for `EntryClass` variables
3. Register pipelines using their class names as identifiers
## Best Practices
- **Reuse Existing Components**: Leverage built-in stages and modules
- **Follow Module Organization**: Place new modules in appropriate directories
- **Match Model Patterns**: Follow existing code patterns and conventions
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This page contains step-by-step instructions to get you quickly started with video generation using FastVideo.
## Table of Contents
- [Software Requirements](#software-requirements)
- [Installation](#installation)
- [Generating Your First Video](#generating-your-first-video)
- [Customizing Generation](#customizing-generation)
- [Available Models](#available-models)
- [Multi-GPU Setup](#multi-gpu-setup)
- [Image-to-Video Generation](#image-to-video-generation)
- [Output Formats and Options](#output-formats-and-options)
- [Performance Optimization](#performance-optimization)
- [Troubleshooting](#troubleshooting)
- [Advanced Configuration](#advanced-configuration)
- [Next Steps](#next-steps)
@@ -27,7 +22,7 @@ We recommend using an environment manager such as `Conda` to create a clean envi
```bash
# Create and activate a new conda environment
conda create -n fastvideo python=3.10
conda create -n fastvideo python=3.12
conda activate fastvideo
# Install FastVideo
@@ -72,72 +67,10 @@ python example.py
The generated video will be saved in the current directory under `my_videos/`.
## Customizing Generation
You can customize various parameters when generating videos using the `SamplingParam` class:
```python
from fastvideo import VideoGenerator, SamplingParam
def main():
# Create the generator
generator = VideoGenerator.from_pretrained(
"Wan-AI/Wan2.1-T2V-1.3B-Diffusers",
num_gpus=1,
)
# Create and customize sampling parameters
sampling_param = SamplingParam.from_pretrained("Wan-AI/Wan2.1-T2V-1.3B-Diffusers")
# How many frames to generate
sampling_param.num_frames = 45
# Video resolution (width, height)
sampling_param.width = 1024
sampling_param.height = 576
# How many steps we denoise the video (higher = better quality, slower generation)
sampling_param.num_inference_steps = 30
# How strongly the video conforms to the prompt (higher = more faithful to prompt)
sampling_param.guidance_scale = 7.5
# Random seed for reproducibility
sampling_param.seed = 42 # Optional, leave unset for random results
# Generate video with custom parameters
prompt = "A beautiful sunset over a calm ocean, with gentle waves."
video = generator.generate_video(
prompt,
sampling_param=sampling_param,
output_path="my_videos/", # Controls where videos are saved
return_frames=True, # Also return frames from this call (defaults to False)
save_video=True
)
# If return_frames=True, video contains the generated frames as a NumPy array
print(f"Generated {len(video)} frames")
if __name__ == '__main__':
main()
```
## Available Models
Please see the [support matrix](#support-matrix) for the list of supported models and their available optimizations.
## Multi-GPU Setup
FastVideo automatically distributes the generation process when multiple GPUs are specified:
```python
# Will use 4 GPUs in parallel for faster generation
generator = VideoGenerator.from_pretrained(
"Wan-AI/Wan2.1-T2V-1.3B-Diffusers",
num_gpus=4,
)
```
## Image-to-Video Generation
You can generate a video starting from an initial image:
@@ -159,53 +92,6 @@ prompt = "A photograph coming to life with gentle movement"
video = generator.generate_video(prompt, sampling_param=sampling_param)
```
## Output Formats and Options
FastVideo provides several options for saving and manipulating the generated videos:
```python
from fastvideo import VideoGenerator, SamplingParam, VideoFormat
# Create the generator
generator = VideoGenerator.from_pretrained("Wan-AI/Wan2.1-T2V-1.3B-Diffusers")
# Generate with custom output options
video = generator.generate_video(
"Drone footage of a tropical rainforest",
output_path="videos/rainforest/", # Custom save location
filename="rainforest_flyover", # Custom filename (no extension needed)
format=VideoFormat.MP4, # Output format: MP4, GIF, or WEBM
fps=30, # Frames per second for the output video
loop=False, # Whether to loop the video (for GIF)
save_frames=True, # Also save individual frames as images
)
```
## Performance Optimization
Optimize FastVideo for your hardware:
```python
from fastvideo import VideoGenerator, PipelineConfig
# Create an optimized configuration
config = PipelineConfig.from_pretrained("Wan-AI/Wan2.1-T2V-1.3B-Diffusers")
# Memory optimization
config.enable_vae_slicing = True # Process VAE in slices to reduce memory
config.enable_model_cpu_offload = True # Offload models to CPU when not in use
# Speed optimization
config.vae_config.precision = "fp16" # Use half precision for VAE
config.enable_xformers = True # Use xformers for attention computation
# Create generator with optimized config
generator = VideoGenerator.from_pretrained(
"Wan-AI/Wan2.1-T2V-1.3B-Diffusers",
pipeline_config=config,
)
```
## Troubleshooting
Common issues and their solutions:
@@ -232,30 +118,7 @@ If the generated video doesn't match your prompt:
## Advanced Configuration
For advanced customization, use the `PipelineConfig` class:
```python
from fastvideo import VideoGenerator, PipelineConfig
# Load the default configuration for a model
config = PipelineConfig.from_pretrained("Wan-AI/Wan2.1-T2V-1.3B-Diffusers")
# Modify configuration settings
config.vae_config.scale_factor = 16
config.vae_config.precision = "fp16"
config.scheduler_config.beta_schedule = "linear"
config.attention_config.attention_type = "xformers"
# Create generator with custom config
generator = VideoGenerator.from_pretrained(
"Wan-AI/Wan2.1-T2V-1.3B-Diffusers",
pipeline_config=config,
)
# Generate video
prompt = "A futuristic cityscape with flying cars and neon signs."
video = generator.generate_video(prompt)
```
## Optimizations
## Next Steps
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# Optimizations
This page describes the various options for speeding up generation times in FastVideo.
## Table of Contents
- Optimized Attention Backends
- [Flash Attention](#optimizations-flash)
- [Sliding Tile Attention](#optimizations-sta)
- [Sage Attention](#optimizations-sage)
- Caching Techniques
- [TeaCache](#optimizations-teacache)
(optimizations-backends)=
## Attention Backends
### Available Backends
- Torch SDPA: `FASTVIDEO_ATTENTION_BACKEND=TORCH_SDPA`
- Flash Attention 2 and 3: `FASTVIDEO_ATTENTION_BACKEND=FLASH_ATTN`
- Sliding Tile Attention: `FASTVIDEO_ATTENTION_BACKEND=SLIDING_TILE_ATTN`
- Sage Attention: `FASTVIDEO_ATTENTION_BACKEND=SAGE_ATTN`
### Configuring Backends
There are two ways to configure the attention backend in FastVideo.
#### 1. In Python
In python, set the `FASTVIDEO_ATTENTION_BACKEND` environment variable before instantiating `VideoGenerator` like this:
```python
os.environ["FASTVIDEO_ATTENTION_BACKEND"] = "SLIDING_TILE_ATTN"
```
#### 2. In CLI
You can also set the environment variable on the command line:
```bash
FASTVIDEO_ATTENTION_BACKEND=SAGE_ATTN python example.py
```
(optimizations-flash)=
### Flash Attention
**`FLASH_ATTN`**
We recommend always installing [Flash Attention 2](https://github.com/Dao-AILab/flash-attention):
```bash
pip install flash-attn==2.7.4.post1 --no-build-isolation
```
And if using a Hopper+ GPU (ie H100), installing [Flash Attention 3](https://github.com/Dao-AILab/flash-attention?tab=readme-ov-file#flashattention-3-beta-release) by compiling it from source (takes about 10 minutes for me):
```bash
git clone https://github.com/Dao-AILab/flash-attention.git && cd flash-attention
cd hopper
pip install ninja
python setup.py install
```
:::{note}
FastVideo will automatically detect and use `FA3` if it is installed when using `FLASH_ATTN` backend.
:::
(optimizations-sta)=
### Sliding Tile Attention
**`SLIDING_TILE_ATTN`**
```bash
pip install st_attn==0.0.4
```
Please see [this page](#sta-installation) for more installation instructions.
(optimizations-sage)=
### Sage Attention
**`SAGE_ATTN`**
To use [SageAttention](https://github.com/thu-ml/SageAttention) 2.1.1, please compile from source:
```bash
git clone https://github.com/thu-ml/SageAttention.git
cd sageattention
python setup.py install # or pip install -e .
```
(optimizations-teacache)=
## Teacache
TeaCache is an optimization technique supported in FastVideo that can significantly speed up video generation by skipping redundant calculations across diffusion steps. This guide explains how to enable and configure TeaCache for optimal performance in FastVideo.
### What is TeaCache?
See the official [TeaCache](https://github.com/ali-vilab/TeaCache) repo and their paper for more details.
### How to Enable TeaCache
Enabling TeaCache is straightforward - simply add the `enable_teacache=True` parameter to your `generate_video()` call:
```python
# ... previous code
generator.generate_video(
prompt="Your prompt here",
sampling_param=params,
enable_teacache=True
)
# more code ...
```
### Complete Example
At the bottom is a complete example of using TeaCache for faster video generation. You can run it using the following command:
```bash
python examples/inference/optimizations/teacache_example.py
```
### Advanced Configuration
While TeaCache works well with default settings, you can fine-tune its behavior by adjusting the threshold value:
1. Lower threshold values (e.g., 0.1) will result in more skipped calculations and faster generation with slightly more potential for quality degradation
2. Higher threshold values (e.g., 0.15-0.23) will skip fewer calculations but maintain quality closer to the original
Note that the optimal threshold depends on your specific model and content.
## Benchmarking different optimizations
To benchmark the performance improvement, try generating the same video with and without TeaCache enabled and compare the generation times:
```python
# Without TeaCache
start_time = time.perf_counter()
generator.generate_video(prompt="Your prompt", enable_teacache=False)
standard_time = time.perf_counter() - start_time
# With TeaCache
start_time = time.perf_counter()
generator.generate_video(prompt="Your prompt", enable_teacache=True)
teacache_time = time.perf_counter() - start_time
print(f"Standard generation: {standard_time:.2f} seconds")
print(f"TeaCache generation: {teacache_time:.2f} seconds")
print(f"Speedup: {standard_time/teacache_time:.2f}x")
```
Note: If you want to benchmark different attention backends, you'll need to reinstantiate `VideoGenerator`.
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(support-matrix)=
# Support Matrix
# Compatibility Matrix
The table below shows every supported model and optimizations supported for them.
| Model Name | HuggingFace Model ID | Resolutions | TeaCache| Sliding Tile Attn | Sage Attn |
|------------|----------------------|-------------|-------------|--------------------------|--|
| HunyuanVideo | hunyuanvideo-community/HunyuanVideo | | | ✅ | ✅ |
| FastHunyuan | FastVideo/FastHunyuan-diffusers | | | ✅| ✅|
| Wan T2V 1.4B | Wan-AI/Wan2.1-T2V-1.3B-Diffusers | 480P | ✅ | ✅ | ✅ |
| Wan T2V 14B | Wan-AI/Wan2.1-T2V-1.3B-Diffusers | 480P, 720P | ✅| ✅| ✅|
| Wan I2V 480P | Wan-AI/Wan2.1-I2V-14B-480P-Diffusers | 480P | ✅| ✅| ✅|
| Wan T2V 720P | Wan-AI/Wan2.1-T2V-14B-Diffusers | 720P | ✅| ✅| ✅|
| StepVideo T2V | Coming soon! | 768px768px204f, 544px992px204f, 544px992px136f | | | |
The symbols used have the following meanings:
- ✅ = Full compatibility
- ❌ = No compatibility
## Models x Optimization
The `HuggingFace Model ID` can be directly pass to `from_pretrained()` methods and FastVideo will use the optimal default parameters when initializing and generating videos.
:::{raw} html
<style>
/* Make smaller to try to improve readability */
td {
font-size: 0.9rem;
text-align: center;
}
th {
text-align: center;
font-size: 0.9rem;
}
</style>
:::
:::{list-table}
:header-rows: 1
:stub-columns: 3
:widths: auto
:class: vertical-table-header
- * Model Name
* HuggingFace Model ID
* Resolutions
* TeaCache
* Sliding Tile Attn
* Sage Attn
- * HunyuanVideo
* `hunyuanvideo-community/HunyuanVideo`
* 720px1280p<br>544px960p
* ❌
* ✅
* ✅
- * FastHunyuan
* `FastVideo/FastHunyuan-diffusers`
* 720px1280p<br>544px960p
* ❌
* ✅
* ✅
- * Wan T2V 1.4B
* `Wan-AI/Wan2.1-T2V-1.3B-Diffusers`
* 480P
* ✅
* ✅*
* ✅
- * Wan T2V 14B
* `Wan-AI/Wan2.1-T2V-1.3B-Diffusers`
* 480P, 720P
* ✅
* ✅*
* ✅
- * Wan I2V 480P
* `Wan-AI/Wan2.1-I2V-14B-480P-Diffusers`
* 480P
* ✅
* ✅*
* ✅
- * Wan T2V 720P
* `Wan-AI/Wan2.1-T2V-14B-Diffusers`
* 720P
* ✅
* ✅*
* ✅
- * StepVideo T2V
* Coming soon!
* 768px768px204f<br>544px992px204f<br>544px992px136f
*
*
*
:::
**Note**: there are some known quality issues with Wan2.1 + Sliding Tile Attn. We are working on fixing this issue.
## Special requirements