Denoising Deep Generative ModelsDownload PDF

Published: 06 Dec 2022, Last Modified: 22 Oct 2023ICBINB spotlightReaders: Everyone
Keywords: generative models, manifold hypothesis
TL;DR: We show that two seemingly sensible ways of accounting for the manifold hypothesis in likelihood-based deep generative models do not improve performance
Abstract: Likelihood-based deep generative models have recently been shown to exhibit pathological behaviour under the manifold hypothesis as a consequence of using high-dimensional densities to model data with low-dimensional structure. In this paper we propose two methodologies aimed at addressing this problem. Both are based on adding Gaussian noise to the data to remove the dimensionality mismatch during training, and both provide a denoising mechanism whose goal is to sample from the model as though no noise had been added to the data. Our first approach is based on Tweedie's formula, and the second on models which take the variance of added noise as a conditional input. We show that surprisingly, while well motivated, these approaches only sporadically improve performance over not adding noise, and that other methods of addressing the dimensionality mismatch are more empirically adequate.
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