Deep Convolution Neural Networks (CNNs) can easily be fooled by subtle,
imperceptible changes to the input images. To address this vulnerability,
adversarial training creates perturbation patterns and includes them in the
training set to robustify the model. In contrast to existing adversarial
training methods that only use class-boundary information (e.g., using a
cross-entropy loss), we propose to exploit additional information from the
feature space to craft stronger adversaries that are in turn used to learn a
robust model. Specifically, we use the style and content information of the
target sample from another class, alongside its class-boundary information to
create adversarial perturbations. We apply our proposed multi-task objective in
a deeply supervised manner, extracting multi-scale feature knowledge to create
maximally separating adversaries. Subsequently, we propose a max-margin
adversarial training approach that minimizes the distance between source image
and its adversary and maximizes the distance between the adversary and the
target image. Our adversarial training approach demonstrates strong robustness
compared to state-of-the-art defenses, generalizes well to naturally occurring
corruptions and data distributional shifts, and retains the model accuracy on
clean examples.

利用目标样本的样式和内容信息以及其类边界信息创建对抗性扰动，将其应用于多任务目标并进行深度监督，提取多尺度特征知识以创建最大分离对手，随后提出最大间隔对抗训练方法，最小化源图像与其对手之间的距离，并最大化对手和目标图像之间的距离，证明与最先进的防御相比，我们提出的对抗训练方法表现出强大的鲁棒性，对自然出现的损坏和数据分布变化具有良好的泛化能力，并保留了模型在干净样本上的准确性。