A Comparison of Syntactically Motivated Word Alignment Spaces

Abstract

This work is concerned with the space of alignments searched by word alignment systems. We focus on situations where word re-ordering is limited by syntax. We present two new alignment spaces that limit an ITG according to a given dependency parse. We provide D-ITG grammars to search these spaces completely and without redundancy. We conduct a careful comparison of five alignment spaces, and show that limiting search with an ITG reduces error rate by 10%, while a D-ITG produces a 31% reduction.

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Cite this paper

@inproceedings{Cherry2006ACO, title={A Comparison of Syntactically Motivated Word Alignment Spaces}, author={Colin Cherry and Dekang Lin}, booktitle={EACL}, year={2006} }