A Closer Look at the Optimization Landscapes of Generative Adversarial Networks
Authors: Hugo Berard, Gauthier Gidel, Amjad Almahairi, Pascal Vincent, Simon Lacoste-Julien
Keywords: Deep Learning, Generative models, GANs, Optimization, Visualization
TL;DR: By proposing new visualization techniques we give better insights on GANs optimization in practical settings, we show that GANs on challenging datasets exhibit rotational behavior and do not converge to Nash-Equilibria
Abstract: Generative adversarial networks have been very successful in generative modeling, however they remain relatively challenging to train compared to standard deep neural networks. In this paper, we propose new visualization techniques for the optimization landscapes of GANs that enable us to study the game vector field resulting from the concatenation of the gradient of both players.   Using these visualization techniques we try to bridge the gap between theory and practice by showing empirically that the training of GANs exhibits significant rotations around LSSP, similar to the one predicted by theory on toy examples. Moreover, we provide empirical evidence that GAN training seems to converge to a stable stationary point which is a saddle point for the generator loss, not a minimum, while still achieving excellent performance.