Generative Models and Model Criticism via Optimized Maximum Mean Discrepancy

Dougal J. Sutherland, Hsiao-Yu Tung, Heiko Strathmann, Soumyajit De, Aaditya Ramdas, Alex Smola, Arthur Gretton

Nov 04, 2016 (modified: Feb 11, 2017) ICLR 2017 conference submission readers: everyone
  • Abstract: We propose a method to optimize the representation and distinguishability of samples from two probability distributions, by maximizing the estimated power of a statistical test based on the maximum mean discrepancy (MMD). This optimized MMD is applied to the setting of unsupervised learning by generative adversarial networks (GAN), in which a model attempts to generate realistic samples, and a discriminator attempts to tell these apart from data samples. In this context, the MMD may be used in two roles: first, as a discriminator, either directly on the samples, or on features of the samples. Second, the MMD can be used to evaluate the performance of a generative model, by testing the model’s samples against a reference data set. In the latter role, the optimized MMD is particularly helpful, as it gives an interpretable indication of how the model and data distributions differ, even in cases where individual model samples are not easily distinguished either by eye or by classifier.
  • TL;DR: A way to optimize the power of an MMD test, to use it for evaluating generative models and training GANs
  • Keywords: Unsupervised Learning
  • Conflicts: cmu.edu, berkeley.edu, ucl.ac.uk

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