TAILIEUCHUNG - Báo cáo khoa học: "FRAGMENTATION AND PART OF SPEECH DISAMBIGUATION"

That at least some syntax is necessary to support semantic processing is fairly obvious. To know exactly how much syntax is needed, however, and how and when to apply it, is still an open and crucial, albeit old, question. This paper discusses the solutions used in a semantic analyser of French called SABA, developed at the University of Liege, Belgium. Specifically, we shall argue in favor of the usefulness of two syntactic processes: fragmentation, which can he interleaved with semantic processing, and part-of-speech disambiguation, which can be performed as a preprocesslng step. . | FRAGMENTATION AND PART OF SPEECH DISAMBIGUATION1 Jean-Louis Binot . Kwikstraat 4 B3078 Everberg Belgium ABSTRACT That at least some syntax is necessary to support semantic processing is fairly obvious. To know exactly how much syntax is needed however and how and when to apply it is still an open and crucial albeit old question. This paper discusses the solutions used in a semantic analyser of French called SABA developed at the University of Liege Belgium. Specifically we shall argue in favor of the usefulness of two syntactic processes fragmentation which can be interleaved with semantic processing and part-of-speech disambiguation which can be performed as a preprocessing step. 1. Introduction The role of syntax is one of these issues in natural language processing which albeit old and often hotly debated have yet to receive a definitive answer. Lytinen 86 distinguishes two approaches to NL processing. Followers of the modular approach believe usually in the autonomy of syntax and in the usefulness and costeffectiveness of a purely syntactic stage of processing. Results of this approach include the development of new grammatical formalisms Weir et al. 86 Ristad 86 and of large syntactic grammars Jensen et al. 86 . Followers of the integrated approach on the contrary believe that semantics should be used as soon as possible in the parsing process. An integrated system would have no discernable stages of parsing and would build directly a meaning representation without building an intermediate syntactic structure. Mow much syntax is needed to support this semantic processing however and how should the integration between syntax and semantics be done are still open and crucial questions. Some integrated systems such as 1PP Schank et al. 80 and Wilks Preference Semantics system Wilks 75 were trying to reduce the role of syntax as much as possible. Lytinen proposes a more moderate option in which separate syntactic and semantic rules are dynamically combined at

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