2005 | OriginalPaper | Buchkapitel
A Re-examination of IR Techniques in QA System
verfasst von : Yi Chang, Hongbo Xu, Shuo Bai
Erschienen in: Natural Language Processing – IJCNLP 2004
Verlag: Springer Berlin Heidelberg
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The performance of Information Retrieval in the Question Answering system is not satisfactory from our experiences in TREC QA Track. In this article, we take a comparative study to re-examine IR techniques on document retrieval and sentence level retrieval respectively. Our study shows: 1) query reformulation should be a necessary step to achieve a better retrieval performance; 2) The techniques for document retrieval are also effective in sentence level retrieval, and single sentence will be the appropriate retrieval granularity.