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Lemaza: An Arabic why-question answering system*

Published online by Cambridge University Press:  24 August 2017

AQIL M. AZMI  and
NOUF A. ALSHENAIFI
AQIL M. AZMI
Affiliation:
Department of Computer Science, King Saud University, Riyadh 11543, Saudi Arabia e-mail: aqil@ksu.edu.sa, noalshenaifi@ksu.edu.sa
NOUF A. ALSHENAIFI
Affiliation:
Department of Computer Science, King Saud University, Riyadh 11543, Saudi Arabia e-mail: aqil@ksu.edu.sa, noalshenaifi@ksu.edu.sa
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Abstract

Question answering systems retrieve information from documents in response to queries. Most of the questions are who- and what-type questions that deal with named entities. A less common and more challenging question to deal with is the why -question. In this paper, we introduce Lemaza (Arabic for why), a system for automatically answering why -questions for Arabic texts. The system is composed of four main components that make use of the Rhetorical Structure Theory. To evaluate Lemaza, we prepared a set of why -question–answer pairs whose answer can be found in a corpus that we compiled out of Open Source Arabic Corpora. Lemaza performed best when the stop-words were not removed. The performance measure was 72.7%, 79.2% and 78.7% for recall, precision and c@1, respectively.

Type
Articles
Information
Natural Language Engineering , Volume 23 , Issue 6 , November 2017 , pp. 877 - 903
Copyright
Copyright © Cambridge University Press 2017 

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Footnotes

*

We would like to thank W. Al-Sanie for sharing his RST implementation; and the language specialist for helping us with why-question–answer pairs. The first author would like to thank Miss Maryam for her assistance in proof-reading the manuscript. Special thanks to all three anonymous reviewers for their constructive comments, which helped in further improvement of the manuscript. This work was supported by a special fund in the Research Center of College of Computer & Information Sciences (CCIS) at King Saud University for which the authors are thankful.

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