January 2018
Beginner to intermediate
284 pages
8h 35m
English
Content preview from Deep Learning Essentials
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BLEU
Bilingual Evaluation Understudy (BLEU) is a popular metric for machine translation evaluation. It computes an n-gram based precision for the candidate sentence with respect to the references. Intelligibility or grammatical correctness are not taken into account. BLEU computes the geometric mean of the n-gram precisions and adds a brevity penalty (penalizes system results that are shorter than the general length of a reference) to discourage overly short sentences. The range of BLEU is always between zero and one. A number closer to one indicates that the candidate text is more similar to the reference texts. For multiple references, the maximum score is returned as the judgment of quality.
The most common formulation of BLEU is BLEU4, ...
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