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Speech & natural language publications August 1, 2008 Conference Paper

Improving alignments for better confusion networks for combining machine translation systems

SRI International August 1, 2008

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N. F. Ayan, J. Zheng and W. Wang, “Improving alignments for better confusion networks for combining machine translation system,” in Proc. 22nd International Conference on Computational Linguistics, 2008, vol. 1, pp. 33–40.

Abstract

The state-of-the-art system combination method for machine translation (MT) is the word-based combination using confusion networks. One of the crucial steps in confusion network decoding is the alignment of different hypotheses to each other when building a network. In this paper, we present new methods to improve alignment of hypotheses using word synonyms and a two-pass alignment strategy. We demonstrate that combination with the new alignment technique yields up to 2.9 BLEU point improvement over the best input system and up to 1.3 BLEU point improvement over a state-of-the-art combination method on two different language pairs.

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