A Re-examination of IR Techniques in QA System

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.

• Type: Conference
• Year: 2004
• Where: IJCNLP
• Authors: Yi Chang, Hongbo Xu, Shuo Bai
• Keywords: Better Retrieval Performance, Document Retrieval, IJCNLP 2004, Sentence Level Retrieval