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Log-linear Combinations of Monolingual and Bilingual Neural Machine Translation Models for Automatic Post-Editing

05/16/2016
by   Marcin Junczys-Dowmunt, et al.
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This paper describes the submission of the AMU (Adam Mickiewicz University) team to the Automatic Post-Editing (APE) task of WMT 2016. We explore the application of neural translation models to the APE problem and achieve good results by treating different models as components in a log-linear model, allowing for multiple inputs (the MT-output and the source) that are decoded to the same target language (post-edited translations). A simple string-matching penalty integrated within the log-linear model is used to control for higher faithfulness with regard to the raw machine translation output. To overcome the problem of too little training data, we generate large amounts of artificial data. Our submission improves over the uncorrected baseline on the unseen test set by -3.2% TER and +5.5% BLEU and outperforms any other system submitted to the shared-task by a large margin.

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