Paper: A Correction Model for Word Alignments

ACL ID D11-1082
Title A Correction Model for Word Alignments
Venue Conference on Empirical Methods in Natural Language Processing
Session Main Conference
Year 2011

Models of word alignment built as sequences of links have limited expressive power, but are easy to decode. Word aligners that model the alignment matrix can express arbitrary align- ments, but are difficult to decode. We pro- pose an alignment matrix model as a cor- rection algorithm to an underlying sequence- based aligner. Then a greedy decoding al- gorithm enables the full expressive power of the alignment matrix formulation. Improved alignment performance is shown for all nine language pairs tested. The improved align- ments also improved translation quality from Chinese to English and English to Italian.