Paper: Bidirectional Phrase-based Statistical Machine Translation

ACL ID D09-1117
Title Bidirectional Phrase-based Statistical Machine Translation
Venue Conference on Empirical Methods in Natural Language Processing
Session Main Conference
Year 2009

This paper investigates the effect of di- rection in phrase-based statistial machine translation decoding. We compare a typ- ical phrase-based machine translation de- coder using a left-to-right decoding strat- egy to a right-to-left decoder. We also investigate the effectiveness of a bidirec- tional decoding strategy that integrates both mono-directional approaches, with the aim of reducing the effects due to lan- guage specificity. Our experimental eval- uation was extensive, based on 272 differ- ent language pairs, and gave the surprising result that for most of the language pairs, it was better decode from right-to-left than from left-to-right. As expected the rela- tive performance of left-to-right and right- to-left strategies proved to be highly lan- guage dependent. The bidirection...