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Using Stable Diffusion with Python

Using Stable Diffusion with Python

By : Andrew Zhu (Shudong Zhu)
4.8 (5)
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Using Stable Diffusion with Python

Using Stable Diffusion with Python

4.8 (5)
By: Andrew Zhu (Shudong Zhu)

Overview of this book

Stable Diffusion is a game-changing AI tool that enables you to create stunning images with code. The author, a seasoned Microsoft applied data scientist and contributor to the Hugging Face Diffusers library, leverages his 15+ years of experience to help you master Stable Diffusion by understanding the underlying concepts and techniques. You’ll be introduced to Stable Diffusion, grasp the theory behind diffusion models, set up your environment, and generate your first image using diffusers. You'll optimize performance, leverage custom models, and integrate community-shared resources like LoRAs, textual inversion, and ControlNet to enhance your creations. Covering techniques such as face restoration, image upscaling, and image restoration, you’ll focus on unlocking prompt limitations, scheduled prompt parsing, and weighted prompts to create a fully customized and industry-level Stable Diffusion app. This book also looks into real-world applications in medical imaging, remote sensing, and photo enhancement. Finally, you'll gain insights into extracting generation data, ensuring data persistence, and leveraging AI models like BLIP for image description extraction. By the end of this book, you'll be able to use Python to generate and edit images and leverage solutions to build Stable Diffusion apps for your business and users.
Table of Contents (29 chapters)
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1
Part 1 – A Whirlwind of Stable Diffusion
8
Part 2 – Improving Diffusers with Custom Features
15
Part 3 – Advanced Topics
21
Part 4 – Building Stable Diffusion into an Application

Optimization solution 3 – enabling Xformers or using PyTorch 2.0

When we provide a text or prompt to generate an image, the encoded text embedding will be fed to the Transformer multi-header attention component of the diffusion UNet.

Inside the Transformer block, the self-attention and cross-attention headers will try to compute the attention score (via the QKV operation). This is computation-heavy and will also use a lot of memory.

The open source Xformers [2] package from Meta Research is built to optimize the process. In short, the main differences between Xformers and standard Transformers are as follows:

  • Hierarchical attention mechanism: Xformers use a hierarchical attention mechanism, which consists of two layers of attention: a coarse layer and a fine layer. The coarse layer attends to the input sequence at a high level, while the fine layer attends to the input sequence at a low level. This allows Xformers to learn long-range dependencies in the input sequence...

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