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Assessing the Impact of Thesaurus-Based Expansion Techniques in QA-Centric IR

Title
Assessing the Impact of Thesaurus-Based Expansion Techniques in QA-Centric IR
Type
Article in International Conference Proceedings Book
Year
2009
Authors
Luis Morais Sarmento
(Author)
FEUP
Jorge Teixeira
(Author)
FEUP
Eugénio Oliveira
(Author)
FEUP
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Conference proceedings International
Pages: 325-332
Evaluating Systems for Multilingual and Multimodal Information Access, 9th Workshop of the Cross-Language Evaluation Forum, CLEF 2008, Aarhus, Denmark, September 17-19, 2008, Revised Selected Papers
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FOS: Natural sciences > Computer and information sciences
CORDIS: Physical sciences > Computer science
Other information
Authenticus ID: P-003-Q31
Abstract (EN): We study the impact of using thesaurus-based query expansion methods at the Information Retrieval (IR) stage of a Questiou Answering (QA) system. We focus on expanding queries for questions regarding actions and events, where, verbs have a central role. Two different thesaurus are used: the OpenOffice thesaurus and an automatically generated verb thesaurus. The performance of thesaurus-based methods is compared against what is obtained by (i) executing no expansion and (ii) applying a simple query generalization method. Results show Oat thesaurus-based approaches help improving recall at retrieval, while keeping satisfactory precision. However, we confirm that positive impact for the final QA performance is mostly achieved due to increase in recall, which can also be obtained by using simpler methods. Nevertheless, because of its better relative precision thesaurus-based expansion is effective in selectively reducing the number of irrelevant text passages retrieved, thus reducing computational load in the answer extraction stage.
Language: English
Type (Professor's evaluation): Scientific
Contact: las@fe.up.pt; jft@fe.up.pt; eco@fe.up.pt
No. of pages: 8
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