An evaluation and analysis of incorporating term dependency for ad-hoc retrieval

Authors:
Hao Lang;Bin Wang;Gareth Jones;Jintao Li;Yang Xu
Affiliations:
Institute of Computing Technology, Chinese Academy of Science, China;Institute of Computing Technology, Chinese Academy of Science, China;School of Computing, Dublin City University, Ireland;Institute of Computing Technology, Chinese Academy of Science, China;Institute of Computing Technology, Chinese Academy of Science, China
Venue:
ECIR'08 Proceedings of the IR research, 30th European conference on Advances in information retrieval
Year:
2008

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Abstract

Although many retrieval models incorporating term dependency have been developed, it is still unclear whether term dependency information can consistently enhance retrieval performance for different queries. We present a novel model that captures the main components of a topic and the relationship between those components and the power of term dependency to improve retrieval performance. Experimental results demonstrate that the power of term dependency strongly depends on the relationship between these components. Without relevance information, the model is still useful by predicting the components based on global statistical information. We show the applicability of the model for adaptively incorporating term dependency for individual queries.