Paper: Automatic Set Expansion for List Question Answering

ACL ID D08-1099
Title Automatic Set Expansion for List Question Answering
Venue Conference on Empirical Methods in Natural Language Processing
Session Main Conference
Year 2008

This paper explores the use of set expan- sion (SE) to improve question answering (QA) when the expected answer is a list of entities belonging to a certain class. Given a small set of seeds, SE algorithms mine textual re- sources to produce an extended list including additional members of the class represented by the seeds. We explore the hypothesis that a noise-resistant SE algorithm can be used to extend candidate answers produced by a QA system and generate a new list of answers that is better than the original list produced by the QA system. We further introduce a hybrid ap- proach which combines the original answers from the QA system with the output from the SE algorithm. Experimental results for several state-of-the-art QA systems show that the hy- brid system performs better than ...