Robust Unsupervised Domain Adaptation (RoUDA) aims to achieve not only clean but also robust cross-domain knowledge transfer from a labeled source domain to an unlabeled target domain. A number of works have been conducted by directly injecting adversarial training (AT) in UDA based on the self-training pipeline and then aiming to generate better adversarial examples (AEs) for AT. Despite the remarkable progress, these methods only focus on finding stronger AEs but neglect how to better learn from these AEs, thus leading to unsatisfied results. In this paper, we investigate robust UDA from a representation learning perspective and design a novel algorithm by utilizing the mutual information theory, dubbed MIRoUDA. Specifically, through mutual information optimization, MIRoUDA is designed to achieve three characteristics that are highly expected in robust UDA, i.e., robustness, discrimination, and generalization. We then propose a dual-model framework accordingly for robust UDA learning. Extensive experiments on various benchmarks verify the effectiveness of the proposed MIRoUDA, in which our method surpasses the state-of-the-arts by a large margin.

通过互信息优化，本文从表示学习的角度研究鲁棒的无监督领域自适应，并设计了一种利用互信息理论的新算法，名为MIRoUDA，以实现鲁棒性、区分性和泛化性等三个期望特性，同时提出了相应的双模型框架，大量实验结果表明我们的方法在各项评测中都明显优于现有技术。

Towards Trustworthy Unsupervised Domain Adaptation: A Representation
  Learning Perspective for Enhancing Robustness, Discrimination, and
  Generalization

朝着可靠的无监督领域适应：增强鲁棒性、区分性和泛化性的表示学习视角