Improving Neural Machine Translation with Neural Syntactic Distance
Improving Neural Machine Translation with Neural Syntactic Distance
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DOI:
10.18653/v1/n19-1205
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发表时间:
2019-06
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影响因子:
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通讯作者:
Chunpeng Ma;Akihiro Tamura;M. Utiyama;E. Sumita;T. Zhao
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文献类型:
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作者:
Chunpeng Ma;Akihiro Tamura;M. Utiyama;E. Sumita;T. Zhao
The explicit use of syntactic information has been proved useful for neural machine translation (NMT). However, previous methods resort to either tree-structured neural networks or long linearized sequences, both of which are inefficient. Neural syntactic distance (NSD) enables us to represent a constituent tree using a sequence whose length is identical to the number of words in the sentence. NSD has been used for constituent parsing, but not in machine translation. We propose five strategies to improve NMT with NSD. Experiments show that it is not trivial to improve NMT with NSD; however, the proposed strategies are shown to improve translation performance of the baseline model (+2.1 (En–Ja), +1.3 (Ja–En), +1.2 (En–Ch), and +1.0 (Ch–En) BLEU).