Deep learning models suffer from catastrophic forgetting when being fine-tuned with samples of new classes. This issue becomes even more pronounced when faced with the domain shift between training and testing data. In this paper, we study the critical and less explored Domain-Generalized Class-Incremental Learning (DGCIL). We design a DGCIL approach that remembers old classes, adapts to new classes, and can classify reliably objects from unseen domains. Specifically, our loss formulation maintains classification boundaries and suppresses the domain-specific information of each class. With no old exemplars stored, we use knowledge distillation and estimate old class prototype drift as incremental training advances. Our prototype representations are based on multivariate Normal distributions whose means and covariances are constantly adapted to changing model features to represent old classes well by adapting to the feature space drift. For old classes, we sample pseudo-features from the adapted Normal distributions with the help of Cholesky decomposition. In contrast to previous pseudo-feature sampling strategies that rely solely on average mean prototypes, our method excels at capturing varying semantic information. Experiments on several benchmarks validate our claims.

研究了深度学习模型在使用新类别样本进行微调时面临的灾难性遗忘问题，特别关注训练和测试数据之间的领域转变。设计了一种能够记忆旧类别、适应新类别并能够可靠地对来自未见领域的对象进行分类的DGCIL方法，通过使用知识蒸馏和估计旧类别原型的漂移，结合多变量正态分布，不断适应模型特征的变化以更好地表示旧类别。经过多个基准测试实验证实了我们的说法。

多变量原型表示的领域泛化增量学习