Improving Pretrained Cross-Lingual Language Models via Self-Labeled Word Alignment

• URL: http://arxiv.org/abs/2106.06381v1
• Date: Fri, 11 Jun 2021 13:36:01 GMT
• Title: Improving Pretrained Cross-Lingual Language Models via Self-Labeled Word Alignment
• Authors: Zewen Chi, Li Dong, Bo Zheng, Shaohan Huang, Xian-Ling Mao, Heyan Huang, Furu Wei
• Abstract summary: Cross-lingual language models are typically pretrained with language modeling on multilingual text or parallel sentences. We introduce denoising word alignment as a new cross-lingual pre-training task. Experimental results show that our method improves cross-lingual transferability on various datasets.
• Score: 49.45399359826453
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The cross-lingual language models are typically pretrained with masked language modeling on multilingual text or parallel sentences. In this paper, we introduce denoising word alignment as a new cross-lingual pre-training task. Specifically, the model first self-labels word alignments for parallel sentences. Then we randomly mask tokens in a bitext pair. Given a masked token, the model uses a pointer network to predict the aligned token in the other language. We alternately perform the above two steps in an expectation-maximization manner. Experimental results show that our method improves cross-lingual transferability on various datasets, especially on the token-level tasks, such as question answering, and structured prediction. Moreover, the model can serve as a pretrained word aligner, which achieves reasonably low error rates on the alignment benchmarks. The code and pretrained parameters are available at https://github.com/CZWin32768/XLM-Align.

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