Diffusion models have an SNR-timestep mismatch during inference that the authors mitigate with per-frequency differential correction, raising generation quality across IDDPM, ADM, DDIM and others.
Refining generative process with discrim- inator guidance in score-based diffusion models
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Elucidating the SNR-t Bias of Diffusion Probabilistic Models
Diffusion models have an SNR-timestep mismatch during inference that the authors mitigate with per-frequency differential correction, raising generation quality across IDDPM, ADM, DDIM and others.