Motivated in part by previous work on English overt pronoun resolution (e.g., Cherry and Bergsma (2005) and Charniak and Elsner (2009)), we estimate the model parameters using the Expectation-Maximization algorithm (Dempster et al., 1977).
we use EM to iteratively (1) estimate the model parameters from data in which each ZP is labeled with the probability that it corefers with each of its candidate antecedents, and (2) apply the resulting model to re-label each ZP with the probability that it corefers with each of its candidate antecedents.