Terminal-Fitted Repair Fixes Classifier-Free Guidance Oversaturation

arXiv·medium signal

This paper diagnoses why classifier-free guidance (CFG), the standard method for strengthening class conditioning in diffusion and flow-matching samplers, breaks the fitted operator and oversaturates at large guidance scales. It proposes a terminal-fitted repair that corrects the sampler, a directly applicable fix for practitioners running image and video generation pipelines that rely on high guidance weights.