Tomoko Izumi


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Predicate-Argument Structure Analysis with Zero-Anaphora Resolution for Dialogue Systems
Kenji Imamura | Ryuichiro Higashinaka | Tomoko Izumi
Proceedings of COLING 2014, the 25th International Conference on Computational Linguistics: Technical Papers

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Constructing a Corpus of Japanese Predicate Phrases for Synonym/Antonym Relations
Tomoko Izumi | Tomohide Shibata | Hisako Asano | Yoshihiro Matsuo | Sadao Kurohashi
Proceedings of the Ninth International Conference on Language Resources and Evaluation (LREC'14)

We construct a large corpus of Japanese predicate phrases for synonym-antonym relations. The corpus consists of 7,278 pairs of predicates such as “receive-permission (ACC)” vs. “obtain-permission (ACC)”, in which each predicate pair is accompanied by a noun phrase and case information. The relations are categorized as synonyms, entailment, antonyms, or unrelated. Antonyms are further categorized into three different classes depending on their aspect of oppositeness. Using the data as a training corpus, we conduct the supervised binary classification of synonymous predicates based on linguistically-motivated features. Combining features that are characteristic of synonymous predicates with those that are characteristic of antonymous predicates, we succeed in automatically identifying synonymous predicates at the high F-score of 0.92, a 0.4 improvement over the baseline method of using the Japanese WordNet. The results of an experiment confirm that the quality of the corpus is high enough to achieve automatic classification. To the best of our knowledge, this is the first and the largest publicly available corpus of Japanese predicate phrases for synonym-antonym relations.


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Standardizing Complex Functional Expressions in Japanese Predicates: Applying Theoretically-Based Paraphrasing Rules
Tomoko Izumi | Kenji Imamura | Genichiro Kikui | Satoshi Sato
Proceedings of the 2010 Workshop on Multiword Expressions: from Theory to Applications


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Discriminative Approach to Predicate-Argument Structure Analysis with Zero-Anaphora Resolution
Kenji Imamura | Kuniko Saito | Tomoko Izumi
Proceedings of the ACL-IJCNLP 2009 Conference Short Papers