Google Brain's Attention Is All You Need paper on sequence-to-sequence translation reports:

Our model achieves 28.4 BLEU on the WMT 2014 Englishto-German translation task, improving over the existing best results, including ensembles, by over 2 BLEU

but the Wikipedia entry on BLEU says:

BLEU’s output is always a number between 0 and 1

What definition of BLEU is the Google Brain paper using? I could not find a separate definition in the paper itself.


1 Answer 1


BLEU (Bi Lingual Evaluation Understudy) is an algorithm for evaluating the quality of text which has been machine-translated (MT) from one natural language to another. BLEU is typically measured on a 0 to 1 scale, with 1 as the hypothetical “perfect” translation.

Google uses the same definition of BLEU but multiplies the typical score by 100.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.