tailieunhanh - Báo cáo khoa học: "Direct Word Sense Matching for Lexical Substitution"

This paper investigates conceptually and empirically the novel sense matching task, which requires to recognize whether the senses of two synonymous words match in context. We suggest direct approaches to the problem, which avoid the intermediate step of explicit word sense disambiguation, and demonstrate their appealing advantages and stimulating potential for future research. | Direct Word Sense Matching for Lexical Substitution Ido Dagan1 Oren Glickman1 Alfio Gliozzo2 Efrat Marmorshtein1 Carlo Strapparava2 department of Computer Science Bar Ilan University Ramat Gan 52900 Israel 2ITC-Irst via Sommarive I-38050 Trento Italy Abstract This paper investigates conceptually and empirically the novel sense matching task which requires to recognize whether the senses of two synonymous words match in context. We suggest direct approaches to the problem which avoid the intermediate step of explicit word sense disambiguation and demonstrate their appealing advantages and stimulating potential for future research. 1 Introduction In many language processing settings it is needed to recognize that a given word or term may be substituted by a synonymous one. In a typical information seeking scenario an information need is specified by some given source words. When looking for texts that match the specified need the source words might be substituted with synonymous target words. For example given the source word weapon a system may substitute it with the target synonym arm . This scenario which is generally referred here as lexical substitution is a common technique for increasing recall in Natural Language Processing NLP applications. In Information Retrieval IR and Question Answering QA it is typically termed query question expansion Moldovan and Mihalcea 2000 Negri 2004 . Lexical Substitution is also commonly applied to identify synonyms in text summarization for paraphrasing in text generation or is integrated into the features of supervised tasks such as Text Categorization and Information Extraction. Naturally lexical substitution is a very common first step in textual entailment recognition which models semantic in ference between a pair of texts in a generalized application independent setting Dagan et al. 2005 . To perform lexical substitution NLP applications typically utilize a knowledge source of synonymous word pairs. The most commonly used

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