Efficient Sampling for Generative Adversarial Networks with Reparameterized Markov Chains
Authors: Yifei Wang, Yisen Wang, Jiansheng Yang, Zhouchen Lin
Keywords: Generative Adverarial Networks, Sampling, Markov chain Monte Carlo, Reparameterization
Abstract: Recently, sampling methods have been successfully applied to enhance the sample quality of Generative Adversarial Networks (GANs). However, in practice, they typically have poor sample efficiency because of the independent proposal sampling from the generator. In this work, we propose REP-GAN, a novel sampling method that allows general dependent proposals by REParameterizing the Markov chains into the latent space of the generator. Theoretically, we show that our reparameterized proposal admits a closed-form Metropolis-Hastings acceptance ratio. Empirically, extensive experiments on synthetic and real datasets demonstrate that our REP-GAN largely improves the sample efficiency and obtains better sample quality simultaneously.