Score estimation in diffusion models is reformulated as solving linear systems in an eigenbasis of a backward Kolmogorov operator, avoiding neural network training and forward SDE simulation.
Advances in Neural Information Processing Systems35, 22870–22882 (2022)
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Optimization-Free Diffusion Model -- A Perturbation Theory Approach
Score estimation in diffusion models is reformulated as solving linear systems in an eigenbasis of a backward Kolmogorov operator, avoiding neural network training and forward SDE simulation.