%0 Journal Article
%T Extracting Answer in QA System: Learning Based
%A Megha Mishra
%A Vishnu Kumar Mishra
%A H.R. Sharma
%J International Journal of Computer Science and Communication Networks
%D 2012
%I Technopark Publications
%X Converting questions to effective queries is crucial to open-domain question answering systems. In this paper, we present a web-based unsupervised learning approach for transforming a given natural-language question to an effective query. The method involves querying a search engine for web passages that contain the answer to the question, extracting patterns that characterize fine-grained classification for answers. Independent evaluation on a set of questions shows that the proposed approach outperforms a naive keyword based approach.
%K Question Answering
%K Machine Learning
%K Query Retrieval.
%U http://ijcscn.com/Documents/Volumes/vol2issue3/ijcscn2012020326.pdf