Acquiring inference rules with temporal constraints by using Japanese coordinated sentences and noun-verb co-occurrences

Authors:
Kentaro Torisawa
Affiliations:
Japan Advanced Institute of Science and Technology, Nomi-shi, Ishikawa-ken, Japan
Venue:
HLT-NAACL '06 Proceedings of the main conference on Human Language Technology Conference of the North American Chapter of the Association of Computational Linguistics
Year:
2006

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Abstract

This paper shows that inference rules with temporal constraints can be acquired by using verb-verb co-occurrences in Japanese coordinated sentences and verb-noun co-occurrences. For example, our unsupervised acquisition method could obtain the inference rule "If someone enforces a law, usually someone enacts the law at the same time as or before the enforcing of the law" since the verbs "enact" and "enforce" frequently co-occurred in coordinated sentences and the verbs also frequently co-occurred with the noun "law". We also show that the accuracy of the acquisition is improved by using the occurrence frequency of a single verb, which we assume indicates how generic the meaning of the verb is.