From 49158e721bfaf6423dca9fc633873218f691c83a Mon Sep 17 00:00:00 2001
From: Patrick Simianer <p@simianer.de>
Date: Fri, 20 Dec 2013 21:53:42 +0100
Subject: fixed BLEU+1 as in Nakov et al

---
 per_sentence_bleu | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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
-- 
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