Recently, considerable effort has been devoted to deep domain adaptation in computer vision and machine learning communities. However, most of existing work only concentrates on learning shared feature representation by minimizing the distribution discrepancy across different domains. Due to the fact that all the domain alignment approaches can only reduce, but not remove the domain shift. Target domain samples distributed near the edge of the clusters, or far from their corresponding class centers are easily to be misclassified by the hyperplane learned from the source domain. To alleviate this issue, we propose to joint domain alignment and discriminative feature learning, which could benefit both domain alignment and final classification. Specifically, an instance-based discriminative feature learning method and a center-based discriminative feature learning method are proposed, both of which guarantee the domain invariant features with better intra-class compactness and inter-class separability. Extensive experiments show that learning the discriminative features in the shared feature space can significantly boost the performance of deep domain adaptation methods.

通过联合域对齐和辨别特征学习的方式，可以带来对域对齐和最终任务分类的双重优化。对于视觉和机器学习领域，大部分现有工作只集中在通过最小化不同域之间的分布差异来学习共享的特征表示。然而，本文指出，所有域对齐方法只能减少，而不是消除域移位的情况。因此，我们提出了一种实例和中心的辨别特征学习方法，它们都可以在共享的特征空间中学习到具有更好的类内紧密性和类间可分性的域不变特征。实验表明，在共享的特征空间中学习辨别特征可以显著提高深度域自适应方法的性能。

联合领域对齐和判别特征学习的非监督深度领域自适应