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Discourse Parsing: Inferring Discourse Structure, Modeling Coherence, and its Applications

Ziheng Lin

ISBN 10: 3659341932 / ISBN 13: 9783659341939
Published by LAP LAMBERT Academic Publishing, 2013
Condition: Good Soft cover
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Title: Discourse Parsing: Inferring Discourse ...

Publisher: LAP LAMBERT Academic Publishing

Publication Date: 2013

Binding: Paperback

Book Condition: Good

About this title


We investigate a natural language problem of parsing a free text into its discourse structure. Specifically, we look at how to parse free texts in the Penn Discourse Treebank representation in a fully data-driven approach. We first propose a classifier to tackle the hard problem of Implicit discourse relation classification. We then design a parsing algorithm and implement it into a full parser in a pipeline. We present a comprehensive evaluation on the parser from both component-wise and error-cascading perspectives. Textual coherence is strongly connected to a text's discourse structure. We present a novel model to represent and assess the discourse coherence of a text with the use of our discourse parser. Our model assumes that coherent text implicitly favors certain types of discourse relation transitions. We implement this model and apply it towards the text ordering ranking task, which aims to discern an original text from a permuted ordering of its sentences. Lastly, we demonstrate that incorporating discourse features can significantly improve two downstream natural language processing (NLP) tasks -- argumentative zoning and summarization -- in the scholarly domain.

About the Author:

Dr Ziheng Lin obtained his Ph.D. from School of Computing, National University of Singapore. His research interests include natural language processing and information retrieval. Specifically, he has been working on discourse analysis, text coherence, text summarization, summarization system evaluation, and opinion mining.

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