A typical machine learning-based approach to zero-anaphora resolution searches for an antecedent in the set of candidates appearing in all the preceding contexts.
in this experiment, we take the ellipsis of nominative arguments of predicates as target zeropronouns because they are most frequently omitted in Japanese, for example, 45.5% of the nominative arguments of predicates are omitted in the NAiST Text Corpus (iida et al., 2007b).