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A guide to classifier-free guidance in diffusion models

Overview of Classifier-Free Guidance in Diffusion Models and Advancements in Noise-Dependent Sampling Schedules

In this blog post, we explored the concept of classifier-free guidance (CFG) and its schedule-based sampling variants. Starting from the basics of CFG, we delved into its application in diffusion models for image generation. We discussed how CFG has evolved over time with advancements such as noise-dependent sampling schedules.

One of the key takeaways from our discussion was the importance of the guidance schedule in CFG. We discussed how monotonically increasing schedules can be beneficial, especially in text-to-image diffusion models. Additionally, we explored the concept of applying CFG only in an intermediate noise interval, which has shown promising results in balancing image fidelity and diversity.

Furthermore, we touched upon the role of self-attention and cross-attention modules in diffusion Unets, which provide valuable information that can be leveraged during the sampling process. Understanding the nuances of these attention mechanisms can help enhance the quality of generated images.

In the next part of this series, we will delve deeper into new approaches that aim to replace the unconditional model in CFG-based image generation. These advancements in CFG seek to make the framework more versatile and applicable to a wider range of generative models.

If you found this blog post helpful, feel free to share it on your favorite social media platforms or subscribe to our newsletter for more updates. Stay tuned for the next installment in our series on CFG and its evolving role in generative models.


**Reference:**
Adaloglou, N., & Kaiser, T. (2024). An overview of classifier-free guidance for diffusion models. Retrieved from https://theaisummer.com/classifier-free-guidance.

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