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bilingual evaluation understudy

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BLEU is designed to approximate human judgement at a corpus level, and performs badly if used to evaluate the quality of individual sentences.

https://en.wikipedia.org/wiki/BLEU

To produce a score for the whole corpus the modified precision scores for the segments are combined using the geometric meanmultiplied by a brevity penalty to prevent very short candidates from receiving too high a score.

bilingual evaluation understudy