Multi-domain text classification can automatically classify texts in various scenarios. Due to the diversity of human languages, texts with the same label in different domains may differ greatly, which brings challenges to the multi-domain text classification. Current advanced methods use the private-shared paradigm, capturing domain-shared features by a shared encoder, and training a private encoder for each domain to extract domain-specific features. However, in realistic scenarios, these methods suffer from inefficiency as new domains are constantly emerging. In this paper, we propose a robust contrastive alignment method to align text classification features of various domains in the same feature space by supervised contrastive learning. By this means, we only need two universal feature extractors to achieve multi-domain text classification. Extensive experimental results show that our method performs on par with or sometimes better than the state-of-the-art method, which uses the complex multi-classifier in a private-shared framework.

该研究提出了一种旨在通过监督对比学习将多个领域的文本分类特征对齐到同一特征空间中的稳健对比对齐方法, 以实现多领域文本分类, 消除了新兴领域增多带来的效率低下问题，从而只需两个通用特征提取器。实验结果表明，该方法在多个领域中效果良好。

多域文本分类的鲁棒对比对齐方法