Paper: Classifying What-Type Questions by Head Noun Tagging

ACL ID C08-1061
Title Classifying What-Type Questions by Head Noun Tagging
Venue International Conference on Computational Linguistics
Session Main Conference
Year 2008

Classifying what-type questions into proper semantic categories is found more challenging than classifying other types in question answering systems. In this paper, we propose to classify what-type questions by head noun tagging. The ap- proach highlights the role of head nouns as the category discriminator of what- type questions. To reduce the semantic ambiguities of head noun, we integrate local syntactic feature, semantic feature and category dependency among adjacent nouns with Conditional Random Fields (CRFs). Experiments on standard ques- tion classification data set show that the approach achieves state-of-the-art per- formances.