Paper: Using Lexico-Semantic Information for Query Expansion in Passage Retrieval for Question Answering

ACL ID W08-1807
Title Using Lexico-Semantic Information for Query Expansion in Passage Retrieval for Question Answering
Venue Coling 2008: Proceedings of the workshop on Human Judgements in Computational Linguistics
Session
Year 2008
Authors

In this paper we investigate the use of sev- eral types of lexico-semantic information for query expansion in the passage retrieval component of our QA system. We have used four corpus-based methods to acquire semantically related words, and we have used one hand-built resource. We eval- uate our techniques on the Dutch CLEF QA track.1 In our experiments expansions that try to bridge the terminological gap between question and document collection do not result in any improvements. How- ever, expansions bridging the knowledge gap show modest improvements.