Experiments on a multinomial language model versus Lucene's off-the-shelf ranking scheme and Rocchio query expansion (TEL@CLEF monolingual task)

Authors:
Jorge Machado;Bruno Martins;José Borbinha
Affiliations:
Departmento de Engenharia Informática, Technical University of Lisbon, Portugal;Departmento de Engenharia Informática, Technical University of Lisbon, Portugal;Departmento de Engenharia Informática, Technical University of Lisbon, Portugal
Venue:
CLEF'08 Proceedings of the 9th Cross-language evaluation forum conference on Evaluating systems for multilingual and multimodal information access
Year:
2008

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Abstract

We describe our participation in the TEL@CLEF task of the CLEF 2008 ad-hoc track, where we measured the retrieval performance of the IR service that is currently under development as part of the DIGMAP project. DIGMAP's IR service is mostly based on Lucene, together with extensions for using query expansion and multinomial language modelling. In our runs, we experimented combinations of query expansion, Lucene's off-the-shelf ranking scheme and the ranking scheme based on multinomial language modelling. Results show that query expansion and multinomial language modelling both result in increased performance.