Semantic Inference at the Lexical-Syntactic Level Roy Bar-Haim and Ido Dagan Computer Science Department Bar-Ilan University Iddo Greental Linguistics Department Tel Aviv University Eyal Shnarch Computer Science Department Bar-Ilan University AAAI2007
Semantic Inference at the Lexical-Syntactic Level. Roy Bar- Haim and Ido Dagan Computer Science Department Bar- Ilan University. Iddo Greental Linguistics Department Tel Aviv University. Eyal Shnarch Computer Science Department Bar- Ilan University. AAAI2007. Outline. Abstrast - PowerPoint PPT Presentation
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Semantic Inference at the Lexical-Syntactic Level
Roy Bar-Haim and Ido DaganComputer Science DepartmentBar-Ilan University
Iddo GreentalLinguistics DepartmentTel Aviv University
Eyal ShnarchComputer Science DepartmentBar-Ilan University
AAAI2007
Outline
• Abstrast• Introduction• Inference Framework• Rule for Generic Linguistic Structures• Lexical-Syntactic Rules• Evaluation• Result• Conclusion
• 上述比賽需要辨識當一個假設 (hypothesis h) 中資訊是否可以從一段話 (t) 中得知,稱之為– t entails h
Introduction
• 可能的實際應用在 QA 系統 :– 問 : Who killed Kennedy?– 轉換成 h( 假設 ): X killed Kennedy.– 到 copus 中找尋適合的句子證明假設成立 :– The assassination of Kennedy by Oswald shook the
– 舉例 :• Polarity( 極性 ): • Yadav was forced to resign.• Yadav resigned.
• Negation and Modality Annotation Rules:– Modal verbs: 像是 should, can, might…– Negation:• What we’ve never seen is actual costs come down.• What we’ve never seen is actual costs come down.
Rule for Generic Linguistic Structures
• 其他 :– Determiners( 限定詞 , 限定名詞 ):• The plaintiffs filed their lawsuit last year in U.S. District
Court in Miami.• The plaintiffs filed a lawsuit last year in U.S. District
Court in Miami.
• Generic Default Rules:– 刪除修飾語 (mod)
Lexical-Syntactic Rules
• Nominalization Rules:– These rules were derived automatically (Ron2006)
from Nomlex (NOMinalization Lexicon)– 例 : X’s acquisition of Y 產生 X acquired Y
• Automatically Learned Rules:– DIRT (Lin & Pantel 2001) and TEASE (Szpektor et
al.2004) are two state-of-the-art unsupervised algorithms that learn lexical-syntactic inference rules.