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Poster
Metric Learning for Adversarial Robustness
Chengzhi Mao · Ziyuan Zhong · Junfeng Yang · Carl Vondrick · Baishakhi Ray

Wed Dec 11 05:00 PM -- 07:00 PM (PST) @ East Exhibition Hall B + C #38

Deep networks are well-known to be fragile to adversarial attacks. We conduct an empirical analysis of deep representations under the state-of-the-art attack method called PGD, and find that the attack causes the internal representation to shift closer to the false'' class. Motivated by this observation, we propose to regularize the representation space under attack with metric learning to produce more robust classifiers. By carefully sampling examples for metric learning, our learned representation not only increases robustness, but also detects previously unseen adversarial samples. Quantitative experiments show improvement of robustness accuracy by up to 4% and detection efficiency by up to 6% according to Area Under Curve score over prior work. The code of our work is available at https://github.com/columbia/MetricLearningAdversarial_Robustness.