Word error rate

The Word error rate (WER) is a metric based on the Levenshtein distance, where the Levenshtein distance works at the character level, WER works at the word level. It was originally used for measuring the performance of speech recognition systems, but is also used in the evaluation of machine translation. The metric is based on the calculation of the number of words which differ between a piece of machine translated text and a reference translation.

A related metric is the Position-independent word error rate (PER), this allows for re-ordering of words and sequences of words between a translated text and a references translation.

This guide is licensed under the GNU Free Documentation License. It uses material from the Wikipedia.

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