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We develop a new method for defending deep neural networks against attacks using adversarial dual network learning with randomized nonlinear image transform. We introduce a randomized nonlinear transform to disturb and partially destroy the sophisticated pattern of attack noise. We then design a generative cleaning network to recover the original image content damaged by this nonlinear transform and remove residual attack noise. We also construct a detector network which serves as the dual network for the target classifier to be defended, being able to detect patterns of attack noise. The generative cleaning network and detector network are jointly trained using adversarial learning, fighting against each other to minimize both perceptual loss and adversarial loss. Our extensive experimental results demonstrate that our approach improves the state-of-art by large margins in both white-box and black-box attacks. It significantly improves the classification accuracy for white-box attacks upon the second best method by more than 30% on the SVHN dataset and more than 14% on the challenging CIFAR-10 dataset.

Adversarial Dual Network Learning With Randomized Image Transform for Restoring Attacked Images