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Fix BLEU error: 'divided by 0' when reference_length is zero #483

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Fix BLEU error: 'divided by 0' when reference_length is zero #483

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4 changes: 4 additions & 0 deletions nmt/scripts/bleu.py
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Original file line number Diff line number Diff line change
Expand Up @@ -83,6 +83,10 @@ def compute_bleu(reference_corpus, translation_corpus, max_order=4,
possible_matches_by_order[order-1] += possible_matches

precisions = [0] * max_order

if reference_length == 0:
return 0, precisions, 0, 0, translation_length, reference_length

for i in range(0, max_order):
if smooth:
precisions[i] = ((matches_by_order[i] + 1.) /
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