A new objective function for word alignment

  • Authors:
  • Tugba Bodrumlu;Kevin Knight;Sujith Ravi

  • Affiliations:
  • University of Southern California;University of Southern California;University of Southern California

  • Venue:
  • ILP '09 Proceedings of the Workshop on Integer Linear Programming for Natural Langauge Processing
  • Year:
  • 2009

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Abstract

We develop a new objective function for word alignment that measures the size of the bilingual dictionary induced by an alignment. A word alignment that results in a small dictionary is preferred over one that results in a large dictionary. In order to search for the alignment that minimizes this objective, we cast the problem as an integer linear program. We then extend our objective function to align corpora at the sub-word level, which we demonstrate on a small Turkish-English corpus.