Results show that our method is significantly better than previous combination approaches, including sentence-level constrained methods and a recent phrase-level combination method.
it improves the BLEU (Papineni et al., 2002) score by up to +5.5% on EN-ZH and +2.4% on EN-FR over a phrase-based baseline (Koehn et al., 2003) and decreases the TER (Snover et al., 2006) error by up to -4.3%/-2.2%, respectively.