It's not Greek to mBERT: Inducing Word-Level Translations from Multilingual BERT

• URL: http://arxiv.org/abs/2010.08275v1
• Date: Fri, 16 Oct 2020 09:49:32 GMT
• Title: It's not Greek to mBERT: Inducing Word-Level Translations from Multilingual BERT
• Authors: Hila Gonen, Shauli Ravfogel, Yanai Elazar, Yoav Goldberg
• Abstract summary: multilingual BERT (mBERT) learns rich cross-lingual representations, that allow for transfer across languages. We study the word-level translation information embedded in mBERT and present two simple methods that expose remarkable translation capabilities with no fine-tuning.
• Score: 54.84185432755821
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Recent works have demonstrated that multilingual BERT (mBERT) learns rich cross-lingual representations, that allow for transfer across languages. We study the word-level translation information embedded in mBERT and present two simple methods that expose remarkable translation capabilities with no fine-tuning. The results suggest that most of this information is encoded in a non-linear way, while some of it can also be recovered with purely linear tools. As part of our analysis, we test the hypothesis that mBERT learns representations which contain both a language-encoding component and an abstract, cross-lingual component, and explicitly identify an empirical language-identity subspace within mBERT representations.

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