Generalizing hierarchical phrase-based translation using rules with adjacent nonterminals

Authors:
Hendra Setiawan;Philip Resnik
Affiliations:
University of Maryland, College Park, MD;University of Maryland, College Park, MD
Venue:
HLT '10 Human Language Technologies: The 2010 Annual Conference of the North American Chapter of the Association for Computational Linguistics
Year:
2010

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Abstract

Hierarchical phrase-based translation (Hiero, (Chiang, 2005)) provides an attractive framework within which both short- and long-distance reorderings can be addressed consistently and efficiently. However, Hiero is generally implemented with a constraint preventing the creation of rules with adjacent nonterminals, because such rules introduce computational and modeling challenges. We introduce methods to address these challenges, and demonstrate that rules with adjacent nonterminals can improve Hiero's generalization power and lead to significant performance gains in Chinese-English translation.