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Computer Science @ Rochester
Friday, May 23, 2008
12:30 PM
CSB 703
Ding Liu
University of Rochester
Improved Tree-to-string Transducer for Machine Translation
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 a subtree-based ngram 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.