A Unified and Systematic Lens on Diffusion Models

This chapter brings the variational, score-based, and flow-based perspectives together, showing how they share a common backbone and are largely equivalent. It lays out a roadmap for elucidating training losses, the conditional tricks behind diffusion models, and the role of the Fokker–Planck equation beneath it all.

Chapter 6 of The Principles of Diffusion Models.