Attempt to stop people from publishing non-comparable BLEU scores, as discussed in statmt meeting

Author: kpu

scripts/generic/multi-bleu.perl

@@ -168,6 +168,9 @@ sub add_to_ref {
     $length_translation,
     $length_reference;
 
+
+print STDERR "Do not publish scores from multi-bleu.perl.  The scores depend on your tokenizer, which is unlikely to be reproducible from your paper or consistent across research groups.  Instead you should detokenize then use mteval-v14.pl, which has a standard tokenization.  Scores from multi-bleu.perl can still be used for internal purposes when you have a consistent tokenizer.\n";
+
 sub my_log {
   return -9999999999 unless $_[0];
   return log($_[0]);