Paper: Integrating Phrase-based Reordering Features into a Chart-based Decoder for Machine Translation

ACL ID P13-1156
Title Integrating Phrase-based Reordering Features into a Chart-based Decoder for Machine Translation
Venue Annual Meeting of the Association of Computational Linguistics
Session Main Conference
Year 2013
Authors

Hiero translation models have two lim- itations compared to phrase-based mod- els: 1) Limited hypothesis space; 2) No lexicalized reordering model. We pro- pose an extension of Hiero called Phrasal- Hiero to address Hiero?s second problem. Phrasal-Hiero still has the same hypoth- esis space as the original Hiero but in- corporates a phrase-based distance cost feature and lexicalized reodering features into the chart decoder. The work consists of two parts: 1) for each Hiero transla- tion derivation, find its corresponding dis- continuous phrase-based path. 2) Extend the chart decoder to incorporate features from the phrase-based path. We achieve significant improvement over both Hiero and phrase-based baselines for Arabic- English, Chinese-English and German- English translation.