For example, using a modified lexical weighting, the systems are ranked according to their BLEU scores as follows: S B , S A , S G , S I , S U -an ordering that differs from that of AER but is identical to that of CPER (with a phrase length of 3) for Chinese.
we designed CPER, a new phrase-oriented metric that is more informative than AER when the alignments are used in a phrase-based MT system because it is an indicator of how the set of phrases differ from one alignment to the next according to a pre-specified maximum phrase length.