With the perceptron algorithm (Shen and Joshi, 2005), the gradient of the hinge loss is: The training instances for the discriminative learning in pairwise ranking are made by comparing the N-best list of the translation candidates scored by the smoothed sentence-level BLEU (Liang et al., 2006).
we use the mixture model based approach proposed by Koehn and Schroeder 1 Many web portal sites contain domain information for webpages, such as "www.yahoo.com" in English and "www.sina.com.cn" in Chinese and etc.