Such comparisons are done either at lexical level (Papineni et al., 2002;Doddington, 2002), or at linguisticallyricher levels using paraphrases (Zhou et al., 2006;Kauchak and Barzilay, 2006), WordNet (Lavie and Agarwal, 2007), or syntax (Liu and Gildea, 2005;Owczarzak et al., 2007;Yang et al., 2008;Amigó et al., 2009).
we also report the BLEU performance of the TrustRank-MT system on the Regression Test set.