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The Theory and Practice of Discourse Parsing and Summarization  무료배송

 
지은이 : Daniel Marcu
출판사 : MIT
페이지수 : 268 pages
ISBN : 0262133725
예상출고일 : 입금확인후 2일 이내
주문수량 :
도서가격 : 품절
     

 

Until now, most discourse researchers have assumed that full semantic understanding is necessary to derive the discourse structure of texts. This book documents the first serious attempt to construct automatically and use nonsemantic computational structures for text summarization. Daniel Marcu develops a semantics-free theoretical framework that is both general enough to be applicable to naturally occurring texts and concise enough to facilitate an algorithmic approach to discourse analysis. He presents and evaluates two discourse parsing methods: one uses manually written rules that reflect common patterns of usage of cue phrases such as "however" and "in addition to"; the other uses rules that are learned automatically from a corpus of discourse structures. By means of a psycholinguistic experiment, Marcu demonstrates how a discourse-based summarizer identifies the most important parts of texts at levels of performance that are close to those of humans.Marcu also discusses how the automatic derivation of discourse structures may be used to improve the performance of current natural language generation, machine translation, summarization, question answering, and information retrieval systems.

Daniel Marcu is a Research Scientist at the Information Sciences Institute at the University of Southern California and Research Assistant Professor in the university''s Department of Computer Science.

1. THEORETICAL FOUNDATIONS
2. THE RHETORICAL PARSING OF FREE TEXTS
3. SUMMARIZATION

"This is a text about a computational interpretation of Rhetorical Structure Theory (RST) as applied to text summarisation. Marcu cites an impressive array of experiments that he (and others) performed in testing his implementation of RST. The empirical basis of much of his work is quite impressive.

He provides a bundle of algorithms which strengthen the text enormously. The difficulty with the text is not so much the presentation, whihc is clear, as the underlying philosophical assumption that one can do nonsemantically directed parsing of texts. The issue goes far beyond this text however.

Like a number of other discourse theories, RST has been criticised for providing form rather than content. Marcu shows that in certain cases the form of a text is a reasonable guide to its point or purpose. Not everyone, I suspect, will accept his starting point - just as there is little agrement on the categorisation of discourse moves. However, by bringing together his work so systematically, Marcu has done a great service to the debate over discourse and text dynamics.

Moreover, Marcu is focused on RST as a handle on texts rather than conversations. This restriction makes the work all the more significant - and provides lots of food for thought. Definitely a buy, even if you disagree with the fundamental operational definitions. "

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