TAILIEUCHUNG - Báo cáo khoa học: "Hypertagging: Supertagging for Surface Realization with CCG"

In lexicalized grammatical formalisms, it is possible to separate lexical category assignment from the combinatory processes that make use of such categories, such as parsing and realization. We adapt techniques from supertagging — a relatively recent technique that performs complex lexical tagging before full parsing (Bangalore and Joshi, 1999; Clark, 2002) — for chart realization in OpenCCG, an open-source NLP toolkit for CCG. We call this approach hypertagging, as it operates at a level “above” the syntax, tagging semantic representations with syntactic lexical categories. . | Hypertagging Supertagging for Surface Realization with CCG Dominic Espinosa and Michael White and Dennis Mehay Department of Linguistics The Ohio State University Columbus OH USA espinosa mwhite mehay @ Abstract In lexicalized grammatical formalisms it is possible to separate lexical category assignment from the combinatory processes that make use of such categories such as parsing and realization. We adapt techniques from supertagging a relatively recent technique that performs complex lexical tagging before full parsing Bangalore and Joshi 1999 Clark 2002 for chart realization in OpenCCG an open-source NLP toolkit for CCG. We call this approach hypertagging as it operates at a level above the syntax tagging semantic representations with syntactic lexical categories. Our results demonstrate that a hypertagger-informed chart realizer can achieve substantial improvements in realization speed being approximately twice as fast with superior realization quality. 1 Introduction In lexicalized grammatical formalisms such as Lex-icalized Tree Adjoining Grammar Schabes et al. 1988 LTAG Combinatory Categorial Grammar Steedman 2000 CCG and Head-Driven PhraseStructure Grammar Pollard and Sag 1994 HPSG it is possible to separate lexical category assignment the assignment of informative syntactic categories to linguistic objects such as words or lexical predicates from the combinatory processes that make use of such categories such as parsing and surface realization. One way of performing lexical assignment is simply to hypothesize all possible lexical categories and then search for the best combination thereof as in the CCG parser in Hock-enmaier 2003 or the chart realizer in Carroll and Oepen 2005 . A relatively recent technique for lexical category assignment is supertagging Bangalore and Joshi 1999 a preprocessing step to parsing that assigns likely categories based on word and part-of-speech POS contextual information. Supertagging was dubbed almost parsing by

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