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Refining Low-Resource Unsupervised Translation by Language Disentanglement of Multilingual Translation Model
Xuan-Phi Nguyen · Shafiq Joty · Kui Wu · Ai Ti Aw

Wed Nov 30 02:00 PM -- 04:00 PM (PST) @ Hall J #626

Numerous recent work on unsupervised machine translation (UMT) implies that competent unsupervised translations of low-resource and unrelated languages, such as Nepali or Sinhala, are only possible if the model is trained in a massive multilingual environment, where these low-resource languages are mixed with high-resource counterparts. Nonetheless, while the high-resource languages greatly help kick-start the target low-resource translation tasks, the language discrepancy between them may hinder their further improvement. In this work, we propose a simple refinement procedure to separate languages from a pre-trained multilingual UMT model for it to focus on only the target low-resource task. Our method achieves the state of the art in the fully unsupervised translation tasks of English to Nepali, Sinhala, Gujarati, Latvian, Estonian and Kazakh, with BLEU score gains of 3.5, 3.5, 3.3, 4.1, 4.2, and 3.3, respectively. Our codebase is available at https://github.com/nxphi47/refineunsupmultilingual_mt

Author Information

Xuan-Phi Nguyen (Nanyang Technological University)
Shafiq Joty (Salesforce Research)
Kui Wu (Institute for Infocomm Research, Singapore)
Ai Ti Aw (Institute for Infocomm Research)

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