Trains one model both conditioned and unconditioned, then extrapolates away from the unconditional prediction at sampling time. Buys prompt adherence for a little diversity, with no second model.
supersedescorrects · extends
classifiesspecializes · part-of
substitutes forapproximates · alternative-to
depends onrequires · validates
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correctsfixes a defect in Diffusion Modelconditioning alone is too weak to follow a prompt
References
Classifier-Free Diffusion Guidance — Ho, Salimans — 2022 · link