TAILIEUCHUNG - Báo cáo khoa học: "Identifying Generic Noun Phrases"

This paper presents a supervised approach for identifying generic noun phrases in context. Generic statements express rulelike knowledge about kinds or events. Therefore, their identification is important for the automatic construction of knowledge bases. In particular, the distinction between generic and non-generic statements is crucial for the correct encoding of generic and instance-level information. Generic expressions have been studied extensively in formal semantics. | Identifying Generic Noun Phrases Nils Reiter and Anette Frank Department of Computational Linguistics Heidelberg University Germany reiter frank @ Abstract This paper presents a supervised approach for identifying generic noun phrases in context. Generic statements express rulelike knowledge about kinds or events. Therefore their identification is important for the automatic construction of knowledge bases. In particular the distinction between generic and non-generic statements is crucial for the correct encoding of generic and instance-level information. Generic expressions have been studied extensively in formal semantics. Building on this work we explore a corpus-based learning approach for identifying generic NPs using selections of linguistically motivated features. Our results perform well above the baseline and existing prior work. 1 Introduction Generic expressions come in two basic forms generic noun phrases and generic sentences. Both express rule-like knowledge but in different ways. A generic noun phrase is a noun phrase that does not refer to a specific set of individual s but rather to a kind or class of individuals. Thus the NP The lion in La 1 is understood as a reference to the class lion instead of a specific individual. Generic NPs are not restricted to occur with kind-related predicates as in . As seen in they may equally well be combined with predicates that denote specific actions. In contrast to the property defined by the verb phrase in may hold of individual lions. 1 a. The lion was the most widespread mammal. b. Lions eat up to 30 kg in one sitting. 1All examples are taken from Wikipedia unless stated oth- erwise. Generic sentences are characterising sentences that quantify over situations or events expressing rule-like knowledge about habitual actions or situations . This is in contrast with sentences that refer to specific events and individuals as in . 2 a. After 1971 Paul Erdos also took .

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