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arXiv · 1508.02225

Improve the Evaluation of Fluency Using Entropy for Machine Translation Evaluation Metrics

Hui Yu·Xiaofeng Wu·Wenbin Jiang·Qun Liu·Shouxun Lin
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Abstract

The widely-used automatic evaluation metrics cannot adequately reflect the fluency of the translations. The n-gram-based metrics, like BLEU, limit the maximum length of matched fragments to n and cannot catch the matched fragments longer than n, so they can only reflect the fluency indirectly. METEOR, which is not limited by n-gram, uses the number of matched chunks but it does not consider the length of each chunk. In this paper, we propose an entropy-based method, which can sufficiently reflect the fluency of translations through the distribution of matched words. This method can easily combine with the widely-used automatic evaluation metrics to improve the evaluation of fluency. Experiments show that the correlations of BLEU and METEOR are improved on sentence level after combining with the entropy-based method on WMT 2010 and WMT 2012.

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Hui Yu, Xiaofeng Wu, Wenbin Jiang, Qun Liu, Shouxun Lin. 2015-08-10. Improve the Evaluation of Fluency Using Entropy for Machine Translation Evaluation Metrics. https://arxiv.org/abs/1508.02225

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