Using shallow syntax information to improve word alignment and reordering for SMT

Authors:
Josep M. Crego;Nizar Habash
Affiliations:
Universitat Politècnica de Catalunya, Barcelona, Spain;Columbia University, New York, NY
Venue:
StatMT '08 Proceedings of the Third Workshop on Statistical Machine Translation
Year:
2008

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Abstract

We describe two methods to improve SMT accuracy using shallow syntax information. First, we use chunks to refine the set of word alignments typically used as a starting point in SMT systems. Second, we extend an N-gram-based SMT system with chunk tags to better account for long-distance reorderings. Experiments are reported on an Arabic-English task showing significant improvements. A human error analysis indicates that long-distance reorderings are captured effectively.