自然言語処理
Online ISSN : 2185-8314
Print ISSN : 1340-7619
論文
Left-Corner Parsing for Identifying PTB-Style Nonlocal Dependencies
Yoshihide KatoShigeki Matsubara
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24 巻 (2017) 3 号 p. 371-394

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Nonlocal dependencies represent syntactic phenomenon such as wh-movement, A-movement in passives, topicalization, raising, control, and right node raising. Nonlocal dependencies play an important role in semantic interpretation. This paper proposes a left-corner parser that identifies nonlocal dependencies. Our parser integrates nonlocal dependency identification into a transition-based system. We adopt a left-corner strategy in order to use the syntactic relation c-command, which plays an important role in nonlocal dependency identification. To utilize the global features captured by nonlocal dependencies, our parser uses a structured perceptron. In experimental evaluations, our parser achieved a good balance between constituent parsing and nonlocal dependency identification.

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© 2017 The Association for Natural Language Processing
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