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- W4319300960 abstract "Several works have shown that deep learning models are vulnerable to adversarial attacks where seemingly simple label-preserving changes to the input image lead to incorrect predictions. To combat this, gradient based adversarial training is generally employed as a standard defense mechanism. However, in cases where the loss landscape is discontinuous with respect to a given perturbation set, first order methods get stuck in local optima, and fail to defend against threat. This is often a problem for many physically realizable perturbation sets such as 2D affine transformations and 3D scene parameters. To work in such settings, we introduce a new optimization framework that alternates between global zeroth order sampling and local gradient updates to compute strong adversaries that can be used to harden the model against attack. Further, we design a powerful optimization algorithm using this framework, called Alternating Evolutionary Sampling and Descent (ASD), which combines an evolutionary search strategy (viz. covariance matrix adaptation) with gradient descent. We consider two settings with discontinuous/discrete and non-convex loss landscapes to evaluate ASD: a) 3D scene parameters and b) 2D patch attacks, and find that it achieves state-of-the-art results on adversarial robustness." @default.
- W4319300960 created "2023-02-07" @default.
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- W4319300960 date "2023-01-01" @default.
- W4319300960 modified "2023-09-23" @default.
- W4319300960 title "Adversarial robustness in discontinuous spaces via alternating sampling & descent" @default.
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- W4319300960 doi "https://doi.org/10.1109/wacv56688.2023.00464" @default.
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