Advanced structural representations for question classification and answer re-ranking

Silvia Quarteroni, Alessandro Moschitti, Suresh Manandhar, Roberto Basili

Research output: Chapter in Book/Report/Conference proceedingConference contribution


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.

Original languageEnglish
Title of host publicationAdvances in Information Retrieval
EditorsG Amati, C Carpineto, G Romano
Place of PublicationBERLIN
Number of pages12
ISBN (Print)978-3-540-71494-1
Publication statusPublished - 2007
Event29th European Conference in Information Retrieval Research (ECIR 2007) - Rome
Duration: 2 Apr 20075 Apr 2007


Conference29th European Conference in Information Retrieval Research (ECIR 2007)

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