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Increasing the robustness of DNNs against image corruptions by playing the Game of Noise

arXiv.org Machine Learning

The human visual system is remarkably robust against a wide range of naturally occurring variations and corruptions like rain or snow. In contrast, the performance of modern image recognition models strongly degrades when evaluated on previously unseen corruptions. Here, we demonstrate that a simple but properly tuned training with additive Gaussian and Speckle noise generalizes surprisingly well to unseen corruptions, easily reaching the previous state of the art on the corruption benchmark ImageNet-C (with ResNet50) and on MNIST-C. We build on top of these strong baseline results and show that an adversarial training of the recognition model against uncorrelated worst-case noise distributions leads to an additional increase in performance. This regularization can be combined with previously proposed defense methods for further improvement.


An Explainable Adversarial Robustness Metric for Deep Learning Neural Networks

arXiv.org Machine Learning

Deep Neural Networks(DNN) have excessively advanced the field of computer vision by achieving state of the art performance in various vision tasks. These results are not limited to the field of vision but can also be seen in speech recognition and machine translation tasks. Recently, DNNs are found to poorly fail when tested with samples that are crafted by making imperceptible changes to the original input images. This causes a gap between the validation and adversarial performance of a DNN. An effective and generalizable robustness metric for evaluating the performance of DNN on these adversarial inputs is still missing from the literature. In this paper, we propose Noise Sensitivity Score (NSS), a metric that quantifies the performance of a DNN on a specific input under different forms of fix-directional attacks. An insightful mathematical explanation is provided for deeply understanding the proposed metric. By leveraging the NSS, we also proposed a skewness based dataset robustness metric for evaluating a DNN's adversarial performance on a given dataset. Extensive experiments using widely used state of the art architectures along with popular classification datasets, such as MNIST, CIFAR-10, CIFAR-100, and ImageNet, are used to validate the effectiveness and generalization of our proposed metrics. Instead of simply measuring a DNN's adversarial robustness in the input domain, as previous works, the proposed NSS is built on top of insightful mathematical understanding of the adversarial attack and gives a more explicit explanation of the robustness.


Are Adversarial Robustness and Common Perturbation Robustness Independant Attributes ?

arXiv.org Machine Learning

Neural Networks have been shown to be sensitive to common perturbations such as blur, Gaussian noise, rotations, etc. They are also vulnerable to some artificial malicious corruptions called adversarial examples. The adversarial examples study has recently become very popular and it sometimes even reduces the term "adversarial robustness" to the term "robustness". Yet, we do not know to what extent the adversarial robustness is related to the global robustness. Similarly, we do not know if a robustness to various common perturbations such as translations or contrast losses for instance, could help with adversarial corruptions. We intend to study the links between the robustnesses of neural networks to both perturbations. With our experiments, we provide one of the first benchmark designed to estimate the robustness of neural networks to common perturbations. We show that increasing the robustness to carefully selected common perturbations, can make neural networks more robust to unseen common perturbations. We also prove that adversarial robustness and robustness to common perturbations are independent. Our results make us believe that neural network robustness should be addressed in a broader sense.


Towards Noise-Robust Neural Networks via Progressive Adversarial Training

arXiv.org Machine Learning

Adversarial examples, intentionally designed inputs tending to mislead deep neural networks, have attracted great attention in the past few years. Although a series of defense strategies have been developed and achieved encouraging model robustness, most of them are still vulnerable to the more commonly witnessed corruptions, e.g., Gaussian noise, blur, etc., in the real world. In this paper, we theoretically and empirically discover the fact that there exists an inherent connection between adversarial robustness and corruption robustness. Based on the fundamental discovery, this paper further proposes a more powerful training method named Progressive Adversarial Training (PAT) that adds diversified adversarial noises progressively during training, and thus obtains robust model against both adversarial examples and corruptions through higher training data complexity. Meanwhile, we also theoretically find that PAT can promise better generalization ability. Experimental evaluation on MNIST, CIFAR-10 and SVHN show that PAT is able to enhance the robustness and generalization of the state-of-the-art network structures, performing comprehensively well compared to various augmentation methods. Moreover, we also propose Mixed Test to evaluate model generalization ability more fairly.


Certified Adversarial Robustness with Additive Noise

Neural Information Processing Systems

The existence of adversarial data examples has drawn significant attention in the deep-learning community; such data are seemingly minimally perturbed relative to the original data, but lead to very different outputs from a deep-learning algorithm. Although a significant body of work on developing defense models has been developed, most such models are heuristic and are often vulnerable to adaptive attacks. Defensive methods that provide theoretical robustness guarantees have been studied intensively, yet most fail to obtain non-trivial robustness when a large-scale model and data are present. To address these limitations, we introduce a framework that is scalable and provides certified bounds on the norm of the input manipulation for constructing adversarial examples. We establish a connection between robustness against adversarial perturbation and additive random noise, and propose a training strategy that can significantly improve the certified bounds.