Modular Diffusion provides an easy-to-use modular API to design and train custom Diffusion Models with PyTorch. Whether you're an enthusiast exploring Diffusion Models or a hardcore ML researcher, this framework is for you.

• ⚙️ Highly Modular Design: Effortlessly swap different components of the diffusion process, including noise type, schedule type, denoising network, and loss function.
• 📚 Growing Library of Pre-built Modules: Get started right away with our comprehensive selection of pre-built modules.
• 🔨 Custom Module Creation Made Easy: Craft your own original modules by inheriting from a base class and implementing the required methods.
• 🤝 Integration with PyTorch: Built on top of PyTorch, Modular Diffusion enables you to develop custom modules using a familiar syntax.
• 🌈 Broad Range of Applications: From generating high-quality images to implementing non-autoregressive text synthesis pipelines, the possiblities are endless.

Modular Diffusion officially supports Python 3.10+ and is available on PyPI:

pip install modular-diffusion

You also need to install the correct PyTorch distribution for your system.

Note: Although Modular Diffusion works with later Python versions, we currently recommend using Python 3.10. This is because torch.compile, which significantly improves the speed of the models, is not currently available for versions above Python 3.10.

With Modular Diffusion, you can build and train a custom Diffusion Model in just a few lines. First, load and normalize your dataset. We are using the dog pictures from AFHQ.

x, _ = zip(*ImageFolder("afhq", ToTensor()))
x = resize(x, [h, w], antialias=False)
x = torch.stack(x) * 2 - 1

Next, build your custom model using either Modular Diffusion's prebuilt modules or your custom modules.

model = diffusion.Model(
   data=Identity(x, batch=128, shuffle=True),
   schedule=Cosine(steps=1000),
   noise=Gaussian(parameter="epsilon", variance="fixed"),
   net=UNet(channels=(1, 64, 128, 256)),
   loss=Simple(parameter="epsilon"),
)

Now, train and sample from the model.

losses = [*model.train(epochs=400)]
z = model.sample(batch=10)
z = z[torch.linspace(0, z.shape[0] - 1, 10).long()]
z = rearrange(z, "t b c h w -> c (b h) (t w)")
save_image((z + 1) / 2, "output.png")

Finally, marvel at the results.

Check out the Getting Started Guide to learn more and find more examples here.

We appreciate your support and welcome your contributions! Please feel free to submit pull requests if you found a bug or typo you want to fix. If you want to contribute a new prebuilt module or feature, please start by opening an issue and discussing it with us. If you don't know where to begin, take a look at the open issues. Please read our Contributing Guide for more details.

This project is licensed under the MIT License.