Abstract

We present an unsupervised approach to symmetric word alignment in which two simple asymmetric models are trained jointly to maximize a combination of data likelihood and agreement between the models. Compared to the standard practice of intersecting predictions of independently-trained models, joint training provides a 32% reduction in AER. Moreover, a simple and efficient pair of HMM aligners provides a 29% reduction in AER over symmetrized IBM model 4 predictions.

Keywords

Simple (philosophy)IBMComputer scienceAgreementReduction (mathematics)Hidden Markov modelWord (group theory)Artificial intelligencePattern recognition (psychology)AlgorithmMathematics

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Year
2006
Type
article
Pages
104-111
Citations
433
Access
Closed

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Percy Liang, Ben Taskar, Dan Klein (2006). Alignment by agreement. , 104-111. https://doi.org/10.3115/1220835.1220849

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DOI
10.3115/1220835.1220849