We investigate and characterize the inherent resilience of conditional Generative Adversarial Networks (cGANs) against noise in their conditioning labels, and exploit this fact in the context of Unsupervised Domain Adaptation (UDA). In UDA, a classifier trained on the labelled source set can be used to infer pseudo-labels on the unlabelled target set. However, this will result in a significant amount of misclassified examples (due to the well-known domain shift issue), which can be interpreted as noise injection in the ground-truth labels for the target set. We show that cGANs are, to some extent, robust against such "shift noise". Indeed, cGANs trained with noisy pseudo-labels, are able to filter such noise and generate cleaner target samples. We exploit this finding in an iterative procedure where a generative model and a classifier are jointly trained: in turn, the generator allows to sample cleaner data from the target distribution, and the classifier allows to associate better labels to target samples, progressively refining target pseudo-labels. Results on common benchmarks show that our method performs better or comparably with the unsupervised domain adaptation state of the art.

利用条件生成式对抗网络 (cGANs) 对其条件标签中的噪声天然具有的鲁棒性，研究并刻画了其主题和研究领域，并在无监督域适应 (UDA) 中利用这一特性。在这种情况下，一个经过训练的分类器可以用于推断出未标记的目标集上的伪标签。我们展示了 cGANs，在某种程度上可以对此类“shift noise”保持稳健性。

无监督域自适应中的生成式伪标签精炼