International Workshop on Spoken Language Translation (IWSLT) 2006 Keihanna Science City, Kyoto, Japan November 27-28, 2006

NTT Statistical Machine Translation for IWSLT 2006

Taro Watanabe, Jun Suzuki, Hajime Tsukada, Hideki Isozaki

NTT Communication Science Laboratories, Seika-cho, Soraku-gun, Kyoto, Japan

We present the NTT translation system that is experimented for the evaluation campaign of “International Workshop on Spoken Language Translation (IWSLT).” The system consists of two primary components: a hierarchical phrase-based statistical machine translation system and a reranking system. The former is conceptualized as a synchronous-CFG in which phrases are hierarchically combined using nonterminals. The latter uses a modified voted perceptron approach with large number of features. Experiments showed that our hierarchical phrase-based model outperformed a conventional phrase-based model. In addition, our reranking algorithm further boosted the performance.

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Bibliographic reference.  Watanabe, Taro / Suzuki, Jun / Tsukada, Hajime / Isozaki, Hideki (2006): "NTT statistical machine translation for IWSLT 2006", In IWSLT-2006, 95-102.