A probabilistic method for analyzing Japanese anaphora integrating zero pronoun detection and resolution

Authors:
Kazuhiro Seki;Atsushi Fujii;Tetsuya Ishikawa
Affiliations:
National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan;University of Library and Information Science, Tsukuba, Japan;University of Library and Information Science, Tsukuba, Japan
Venue:
COLING '02 Proceedings of the 19th international conference on Computational linguistics - Volume 1
Year:
2002

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Abstract

This paper proposes a method to analyze Japanese anaphora, in which zero pronouns (omitted obligatory cases) are used to refer to preceding entities (antecedents). Unlike the case of general coreference resolution, zero pronouns have to be detected prior to resolution because they are not expressed in discourse. Our method integrates two probability parameters to perform zero pronoun detection and resolution in a single framework. The first parameter quantifies the degree to which a given case is a zero pronoun. The second parameter quantifies the degree to which a given entity is the antecedent for a detected zero pronoun. To compute these parameters efficiently, we use corpora with/without annotations of anaphoric relations. We show the effectiveness of our method by way of experiments.