Exploring the Evolution of GANs through Quality Diversity
This addresses training challenges for researchers using evolutionary algorithms with GANs, though it appears incremental as it builds directly on prior work (COEGAN).
The paper tackles the problem of training instability and lack of diversity in evolutionary approaches for GANs by applying a quality-diversity algorithm (NSLC), which increases solution diversity and improves model performance compared to existing methods like COEGAN.
Generative adversarial networks (GANs) achieved relevant advances in the field of generative algorithms, presenting high-quality results mainly in the context of images. However, GANs are hard to train, and several aspects of the model should be previously designed by hand to ensure training success. In this context, evolutionary algorithms such as COEGAN were proposed to solve the challenges in GAN training. Nevertheless, the lack of diversity and premature optimization can be found in some of these solutions. We propose in this paper the application of a quality-diversity algorithm in the evolution of GANs. The solution is based on the Novelty Search with Local Competition (NSLC) algorithm, adapting the concepts used in COEGAN to this new proposal. We compare our proposal with the original COEGAN model and with an alternative version using a global competition approach. The experimental results evidenced that our proposal increases the diversity of the discovered solutions and leverage the performance of the models found by the algorithm. Furthermore, the global competition approach was able to consistently find better models for GANs.