This paper focuses on domain generalization (DG), the task of learning from multiple source domains a model that generalizes well to unseen domains. A main challenge for DG is that the available source domains often exhibit limited diversity, hampering the model's ability to learn to generalize. We therefore employ a data generator to synthesize data from pseudo-novel domains to augment the source domains. This explicitly increases the diversity of available training domains and leads to a more generalizable model. To train the generator, we model the distribution divergence between source and synthesized pseudo-novel domains using optimal transport, and maximize the divergence. To ensure that semantics are preserved in the synthesized data, we further impose cycle-consistency and classification losses on the generator. Our method, L2A-OT (Learning to Augment by Optimal Transport) outperforms current state-of-the-art DG methods on four benchmark datasets.

本文主要探讨如何通过数据生成器来增加多个源域的多样性提高领域泛化能力，在使用了最优传输的分布偏差模型和循环一致性和分类损失的数据生成器模型中，我们的L2A-OT（学习通过最优传输增广）方法在四个基准数据集中表现优于当前最先进的DG方法。

学习生成用于域泛化的新领域