fixed BLEU+1 as in Nakov et al

1 files changed, 1 insertions, 1 deletions

diff --git a/per_sentence_bleu b/per_sentence_bleu
index f024e74..c7c0b0e 100755
--- a/per_sentence_bleu
+++ b/per_sentence_bleu
@@ -16,7 +16,7 @@ end
 def brevity_penalty hypothesis, reference
   a = hypothesis.split; b = reference.split
   return 1.0 if a.size>b.size
-  return Math.exp(1.0 - b.size.to_f/a.size);
+  return Math.exp(1.0 - ((b.size.to_f+1)/a.size));
 end
 
 def per_sentence_bleu hypothesis, reference, n=4