A systematic comparison of various statistical alignment models
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The dominant practice of statistical machine translation (SMT) uses the same Chinese word segmentation specification in both alignment and translation rule induction steps in building Chinese-English SMT system, which may suffer from a suboptimal problem that word segmentation better for alignment is not necessarily better for translation. To tackle this, we propose a framework that uses two different segmentation specifications for alignment and translation respectively: we use Chinese character as the basic unit for alignment, and then convert this alignment to conventional word alignment for translation rule induction. Experimentally, our approach outperformed two baselines: fully word-based system (using word for both alignment and translation) and fully character-based system, in terms of alignment quality and translation performance.