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Unsupervised lexicon induction for clause-level detection of evaluations

Published online by Cambridge University Press:  30 March 2011

HIROSHI KANAYAMA  and
TETSUYA NASUKAWA
HIROSHI KANAYAMA
Affiliation:
IBM Research – Tokyo, 1623-14 Shimotsuruma, Yamato-shi, Kanagawa-ken 242-8502, Japan e-mail: [email protected], [email protected]
TETSUYA NASUKAWA
Affiliation:
IBM Research – Tokyo, 1623-14 Shimotsuruma, Yamato-shi, Kanagawa-ken 242-8502, Japan e-mail: [email protected], [email protected]
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Abstract

This article proposes clause-level evaluation detection, which is a fine-grained type of opinion mining, and describes an unsupervised lexicon building method for capturing domain-specific knowledge by leveraging the similar polarities of sentiments between adjacent clauses. The lexical entries to be acquired are called polar atoms, the minimum human-understandable syntactic structures that specify the polarity of clauses. As a hint to obtain candidate polar atoms, we use context coherency, the tendency for the same polarity to appear successively in a context. Using the overall density and precision of coherency in the corpus, the statistical estimation picks up appropriate polar atoms from among the candidates, without any manual tuning of the threshold values. The experimental results show that the precision of polarity assignment with the automatically acquired lexicon was 83 per cent on average, and our method is robust for corpora in diverse domains and for the size of the initial lexicon.

Type
Articles
Information
Natural Language Engineering , Volume 18 , Issue 1 , January 2012 , pp. 83 - 107
Copyright
Copyright © Cambridge University Press 2011

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