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Wavelet Score-Based Generative Modeling. (arXiv:2208.05003v1 [cs.LG])
Aug. 11, 2022, 1:11 a.m. | Florentin Guth, Simon Coste, Valentin De Bortoli, Stephane Mallat
cs.CV updates on arXiv.org arxiv.org
Score-based generative models (SGMs) synthesize new data samples from
Gaussian white noise by running a time-reversed Stochastic Differential
Equation (SDE) whose drift coefficient depends on some probabilistic score. The
discretization of such SDEs typically requires a large number of time steps and
hence a high computational cost. This is because of ill-conditioning properties
of the score that we analyze mathematically. We show that SGMs can be
considerably accelerated, by factorizing the data distribution into a product
of conditional probabilities of …
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