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Diffusion Model with Perceptual Loss

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arxiv 2401.00110 v7 pith:7NP6T7HC submitted 2023-12-30 cs.CV cs.AIcs.LG

Shanchuan Lin , Xiao Yang This is my paper · ORCID
classification cs.CVcs.AIcs.LG
keywords lossdiffusionguidanceobjectivesamplesgeneratemodelmodels
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Diffusion models without guidance generate very unrealistic samples. Guidance is used ubiquitously, and previous research has attributed its effect to low-temperature sampling that improves quality by trading off diversity. However, this perspective is incomplete. Our research shows that the choice of the loss objective is the underlying reason raw diffusion models fail to generate desirable samples. In this paper, (1) our analysis shows that the loss objective plays an important role in shaping the learned distribution and the MSE loss derived from theories holds assumptions that misalign with data in practice; (2) we explain the effectiveness of guidance methods from a new perspective of perceptual supervision; (3) we validate our hypothesis by training a diffusion model with a novel self-perceptual loss objective and obtaining much more realistic samples without the need for guidance. We hope our work paves the way for future explorations of the diffusion loss objective.

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Cited by 4 Pith papers

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