# [C7/W] Consistency Regularization for Adversarial Robustness

Published in AAAI Conference on Artificial Intelligence (AAAI), 2022

tl;dr: Consistency regularization can also prevent robustness overfitting in adversarial training. 

• Also appeared ICML AdvML Workshop 2021 as an Oral presentation
• Won the Best Paper Award from Korean Artificial Intelligence Association 2021

#### Abstract

Adversarial training (AT) is currently one of the most successful methods to obtain the adversarial robustness of deep neural networks. However, the phenomenon of robust overfitting, i.e., the robustness starts to decrease significantly during AT, has been problematic, not only making practitioners consider a bag of tricks for a successful training, e.g., early stopping, but also incurring a significant generalization gap in the robustness. In this paper, we propose an effective regularization technique that prevents robust overfitting by optimizing an auxiliary consistency' regularization loss during AT. Specifically, we discover that data augmentation is a quite effective tool to mitigate the overfitting in AT, and develop a regularization that forces the predictive distributions after attacking from two different augmentations of the same instance to be similar with each other. Our experimental results demonstrate that such a simple regularization technique brings significant improvements in the test robust accuracy of a wide range of AT methods. More remarkably, we also show that our method could significantly help the model to generalize its robustness against unseen adversaries, e.g., other types or larger perturbations compared to those used during training. Code is available at https://github.com/alinlab/consistency-adversarial.

#### BibTeX

@inproceedings{tack2022consistency,
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