Additionally, many discriminative models use a generative model as a base model and add discriminative features with reranking (Collins, 2000;Charniak and Johnson, 2005;Roark et al., 2004), or train discriminatively a small set of weights for features which are generatively estimated probabilities (Raina et al., 2004;Och and Ney, 2002).
we define Bayesian Networks over the m input variables X 1 , X 2 , .