Advanced structural representations for question classification and answer re-ranking

Authors:
Silvia Quarteroni;Alessandro Moschitti;Suresh Manandhar;Roberto Basili
Affiliations:
The University of York, York, United Kingdom;University of Rome "Tor Vergata", Rome, Italy;The University of York, York, United Kingdom;University of Rome "Tor Vergata", Rome, Italy
Venue:
ECIR'07 Proceedings of the 29th European conference on IR research
Year:
2007

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Abstract

In this paper, we study novel structures to represent information in three vital tasks in question answering: question classification, answer classification and answer reranking. We define a new tree structure called PAS to represent predicate-argument relations, as well as a new kernel function to exploit its representative power. Our experiments with Support Vector Machines and several tree kernel functions suggest that syntactic information helps specific task as question classification, whereas, when data sparseness is higher as in answer classification, studying coarse semantic information like PAS is a promising research area.