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When and Why is Document-level Context Useful in Neural Machine Translation?

2019-10-01 10:40:26
Yunsu Kim, Duc Thanh Tran, Hermann Ney

Abstract

Document-level context has received lots of attention for compensating neural machine translation (NMT) of isolated sentences. However, recent advances in document-level NMT focus on sophisticated integration of the context, explaining its improvement with only a few selected examples or targeted test sets. We extensively quantify the causes of improvements by a document-level model in general test sets, clarifying the limit of the usefulness of document-level context in NMT. We show that most of the improvements are not interpretable as utilizing the context. We also show that a minimal encoding is sufficient for the context modeling and very long context is not helpful for NMT.

Abstract (translated)

URL

https://arxiv.org/abs/1910.00294

PDF

https://arxiv.org/pdf/1910.00294.pdf


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