Conditional Generative Adversarial Models and a Study in their Robustness


02.08.2019
Speaker : Grigorios G. Chrysos, Imperial College London
Date : 02.08.2019
Time: 11:00
Location : "Stelios Orphanoudakis" Seminar Room, FORTH, Heraklion, Crete
Host : Dr. Anastasios Roussos
Abstract:

Generative models lie at the heart of machine learning. Among them, Generative Adversarial Networks (GANs) are one of the most popular (implicit) generative models. When a condition, e.g. prior information, is available, the model is modified to include the condition. The conditional model is named conditional generative adversarial networks (cGANs).

In the first part of the talk, we will review the (conditional) generative adversarial networks, their core components and recent applications. In the second part, we will focus on the robustness of the generator (of cGAN). In the original framework, the regression of the generator is unconstrained, which might lead to arbitrarily large errors in the output. We instead introduce a novel GAN model, called RoCGAN, which leverages structure in the target space of the model. We study how RoCGAN remains robust even in the face of intense noise.

Bio:

Grigorios G. Chrysos is a PhD student in iBUG group working with Stefanos Zafeiriou (Imperial College London). He is in his fourth year working towards a PhD degree, while previously, he graduated from National Technical University of Athens (2014). He has since been working in the field of Computer Vision and statistical Machine Learning, while he has published his work on deformable models in prestigious journals (T-PAMI, IJCV, T-IP). He has co-organised workshops for deformable models, e.g. 2D/3D facial landmark tracking, in CVPR/ICCV. He is a reviewer in prestigious journals including T-PAMI, IJCV, ASOC. His primary research interest is on machine learning; frequently the applications are in computer vision tasks, such as image translation/generation.