Introduction | These methods reach a level comparable to or better than the state-of—the-art rule-based systems (e.g. |
Introduction | On the other hand, rule-based methods derived from theoretical background such as Centering Theory (Grosz et al., 1995) only deal with the salient discourse entities at each point of the discourse status. |
Previous work | Early methods for zero-anaphora resolution were developed with rule-based approaches in mind. |
Previous work | Theory-oriented rule-based methods (Kameyama, 1986; Walker et al., 1994), for example, focus on the Centering Theory (Grosz et al., 1995) and are designed to collect the salient candidate antecedents in the forward-looking center (Cf) list, and then choose the most salient candidate, Cp, as an antecedent of a zero-pronoun according to heuristic rules (e.g. |
Related Work | Rule-based methods: Rule-based PG methods build on a set of paraphrase rules or patterns, which are either hand crafted or automatically collected. |
Related Work | In the early rule-based PG research, the paraphrase rules are generally manually written (McKeown, 1979; Zong et al., 2001), which is expensive and arduous. |
Related Work | Some researchers then tried to automatically extract paraphrase rules (Lin and Pantel, 2001; Barzilay and Lee, 2003; Zhao et al., 2008b), which facilitates the rule-based PG methods. |