August 2026 (A GROUP) - Lecture 6: Classifier - Free Guidance and Prompt Control

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Staffs: ONLY W and K

665 pages, including 166 vid tutorials.

Core paper:

Classifier-Free Diffusion Guidance
Jonathan Ho, Tim Salimans, 2021 / 2022

Topics:

  • Conditional vs unconditional prediction

  • Guidance scale

  • Why prompts can steer generation

  • Why overly strong guidance may create artifacts

Engineering connection:

  • CFG scale in Stable Diffusion

  • Prompt vs input-image tension in image-to-image

  • Why some closed models do not expose prompt weights or guidance scale