Field-weighted XML retrieval based on BM25

Authors:
Wei Lu;Stephen Robertson;Andrew MacFarlane
Affiliations:
Center for Studies of Information Resources, School of Information Management, Wuhan University, China;Microsoft Research, Cambridge, U.K;Centre for Interactive Systems Research, Department of Information Science, City University London
Venue:
INEX'05 Proceedings of the 4th international conference on Initiative for the Evaluation of XML Retrieval
Year:
2005

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Abstract

This is the first year for the Centre for Interactive Systems Research participation of INEX. Based on a newly developed XML indexing and retrieval system on Okapi, we extend Robertson’s field-weighted BM25F for document retrieval to element level retrieval function BM25E. In this paper, we introduce this new function and our experimental method in detail, and then show how we tuned weights for our selected fields by using INEX 2004 topics and assessments. Based on the tuned models we submitted our runs for CO.Thorough, CO.FetchBrowse, the methods we propose show real promise. Existing problems and future work are also discussed.