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Questions tagged [bleu]

For questions related to BLEU (BiLingual Evaluation Understudy), which is a metric for evaluating the quality of text which has been machine-translated from one natural language to another. The metric was proposed in the paper "BLEU: a Method for Automatic Evaluation of Machine Translation" (2002) by Kishore Papineni et al.

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What happens when the output length in the brevity penalty is zero?

The brevity penalty is defined as $$bp = e^{(1- r/c)},$$ where $r$ is the reference length and $c$ is the output length. But what happens if the output length gets zero? Is there any standard way ...