TAILIEUCHUNG - Báo cáo khoa học: "Discriminative Approach to Predicate-Argument Structure Analysis with Zero-Anaphora Resolution"

This paper presents a predicate-argument structure analysis that simultaneously conducts zero-anaphora resolution. By adding noun phrases as candidate arguments that are not only in the sentence of the target predicate but also outside of the sentence, our analyzer identifies arguments regardless of whether they appear in the sentence or not. Because we adopt discriminative models based on maximum entropy for argument identification, we can easily add new features. We add language model scores as well as contextual features. We also use contextual information to restrict candidate arguments. . | Discriminative Approach to Predicate-Argument Structure Analysis with Zero-Anaphora Resolution Kenji Imamura Kuniko Saito and Tomoko Izumi NTT Cyber Space Laboratories NTT Corporation 1-1 Hikarinooka Yokosuka Kanagawa 239-0847 Japan @ Abstract This paper presents a predicate-argument structure analysis that simultaneously conducts zero-anaphora resolution. By adding noun phrases as candidate arguments that are not only in the sentence of the target predicate but also outside of the sentence our analyzer identifies arguments regardless of whether they appear in the sentence or not. Because we adopt discriminative models based on maximum entropy for argument identification we can easily add new features. We add language model scores as well as contextual features. We also use contextual information to restrict candidate arguments. 1 Introduction Predicate-argument structure analysis is a type of semantic role labeling which is an important module to extract event information such as who did what to whom from a sentence. There are many arguments called zero pronouns that do not appear in the surface of a sentence in Japanese. In this case predicate-argument structures cannot be constructed if we only rely on the syntactic information of a single sentence. Similar phenomena also happen in English noun predicates in which arguments of noun predicates sometimes do not exist in the sentence due to things such as ellipses Jiang and Ng 2006 . To correctly extract the structures from such sentences it is necessary to resolve what zero pronouns refer to by using other information such as context. Although predicate-argument structure analysis and zero-anaphora resolution are closely related it was not until recently that these two tasks were lumped together. Due to the developments of large annotated corpora with predicate-argument and coreference relations . Iida et al. 2007 and with case frames several works using .

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