TAILIEUCHUNG - Báo cáo khoa học: "SOME ISSUES IN PARSING AND NATURAL LINGUAGE UNDERSTANDING"

This description c a n be u s e d t o guide semantic and discourse level structure recovery processes such as interpretation, anaphoric resolution, focus tracking, given/new distinctions, ellipsis resolution, etc. in a manner that is independent of the lexical and conceptual content of the utterance. There are several advantages to factoring out such knowledge. | 30MB ISSUES IM PASSING ANS NATURAL LANGUAGE UNDERSTANDING Robert J. Bobrow Bolt Beranek and Newnan Inc. Bonnie L. Webber Department of Computer A Information Science University of Pennsylvania Language is a system for encoding and transmitting Ideas. A theory that seeks to explain linguistic phenomena In terms of this fact 13 a funetional theory. One that does not misses the point. 10 PREAMBLE Our response to the questions posed to this panel Is Influenced by a number of beliefs or biases I which we have developed in the course of building and analyzing the operation of several natural language understanding NLU systems. 1 2 3 12 While the emphasis of the panel is on parsing we feel that the recovery of the syntactic structure of a natural language utterance must be viewed as part of a larger process of recovering the meaning Intentions and goals underlying Its generation. Hence it 13 Inappropriate to consider designing or evaluating natural language parsers or grammrs without taking Into account the architecture of the whole NLU system of which they re a part. This is the premise from which our beliefs arise beliefs which concern two things o the distribution of various types of knowledge In particular syntactic knowledge among the modules of an NLU system o the Information and control flow among those modules. As to the first belief in the NLU systems we have worked on most syntactic Information is localized In a syntactic module although that module does not produce a reified data structure representing the syntactic description of an utterance. Thus If parsing is taken as requiring the production of such a reified structure then we do not believe In Its necessity. However we do believe in the existence of a module which provides syntactic Information to those other parts of the system whose decisions ride on It. As to the second belief we feel that syntax semantics and pragmatics effectively constitute parallel but interacting processors and that information .

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