Improved tree-to-string transducer for machine translation

  • Authors:
  • Ding Liu;Daniel Gildea

  • Affiliations:
  • University of Rochester, Rochester, NY;University of Rochester, Rochester, NY

  • Venue:
  • StatMT '08 Proceedings of the Third Workshop on Statistical Machine Translation
  • Year:
  • 2008

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Abstract

We propose three enhancements to the tree-to-string (TTS) transducer for machine translation: first-level expansion-based normalization for TTS templates, a syntactic alignment framework integrating the insertion of unaligned target words, and subtree-based n-gram model addressing the tree decomposition probability. Empirical results show that these methods improve the performance of a TTS transducer based on the standard BLEU-4 metric. We also experiment with semantic labels in a TTS transducer, and achieve improvement over our baseline system.