NICT's participation to WAT 2019: Multilingualism and Multi-step Fine-Tuning for Low Resource NMT
In this paper we describe our submissions to WAT 2019 for the following tasks: English{--}Tamil translation and Russian{--}Japanese translation. Our team,{``}NICT-5{''}, focused on multilingual domain adaptation and back-translation for Russian{--}Japanese translation and on simple fine-tuning for English{--}Tamil translation . We noted that multi-stage fine tuning is essential in leveraging the power of multilingualism for an extremely low-resource language like Russian{--}Japanese. Furthermore, we can improve the performance of such a low-resource language pair by exploiting a small but in-domain monolingual corpus via back-translation. We managed to obtain second rank in both tasks for all translation directions.
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