Paper: Flexible Answer Typing with Discriminative Preference Ranking

ACL ID E09-1076
Title Flexible Answer Typing with Discriminative Preference Ranking
Venue Annual Meeting of The European Chapter of The Association of Computational Linguistics
Session Main Conference
Year 2009

An important part of question answering is ensuring a candidate answer is plausi- ble as a response. We present a flexible approach based on discriminative prefer- ence ranking to determine which of a set of candidate answers are appropriate. Dis- criminative methods provide superior per- formance while at the same time allow the flexibility of adding new and diverse fea- tures. Experimental results on a set of fo- cused What ...? and Which ...? questions show that our learned preference ranking methods perform better than alternative solutions to the task of answer typing. A gain of almost 0.2 in MRR for both the first appropriate and first correct answers is observed along with an increase in pre- cision over the entire range of recall.