Recent works showed that Generative Adversarial Networks (GANs) can be successfully applied in unsupervised domain adaptation, where, given a labeled source dataset and an unlabeled target dataset, the goal is to train powerful classifiers for the target samples. In particular, it was shown that a GAN objective function can be used to learn target features indistinguishable from the source ones. In this work, we extend this framework by (i) forcing the learned feature extractor to be domain-invariant, and (ii) training it through data augmentation in the feature space, namely performing feature augmentation. While data augmentation in the image space is a well established technique in deep learning, feature augmentation has not yet received the same level of attention. We accomplish it by means of a feature generator trained by playing the GAN minimax game against source features. Results show that both enforcing domain-invariance and performing feature augmentation lead to superior or comparable performance to state-of-the-art results in several unsupervised domain adaptation benchmarks.

本研究使用生成对抗网络（GANs）的目标函数来学习与源数据集不可区分的目标特征，并将其扩展到强制学习通过特征增强在特征空间进行培训的无监督域自适应任务。结果表明，强制进行域不变性和执行特征增强可以导致几个无监督域适应基准测试的优秀或相当的性能。

对抗性特征增强用于无监督域适应