Experiments on a Multinomial Language Model versus Lucene’s Off-the-Shelf Ranking Scheme and Rocchio Query Expansion (TEL@CLEF Monolingual Task)

  • Jorge Machado
  • Bruno Martins
  • José Borbinha
Part of the Lecture Notes in Computer Science book series (LNCS, volume 5706)


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.


Language Model Vector Space Model Lucene Rocchio QE Stemming 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Porter, M.F.: An algorithm for suffix stripping. In: Sparck Jones, K., Willett, P. (eds.) Readings in Information Retrieval, pp. 313–316. Morgan Kaufmann, San Francisco (1980/1997)Google Scholar
  2. 2.
    Hiemstra, D.: Using Language Models for Information Retrieval: Ph.D. Thesis, Centre for Telematics and Information Technology, University of Twente (2001)Google Scholar
  3. 3.
    Rocchio, J.J.: Relevance Feedback in Information Retrieval. In: The SMART Retrieval System. Experiments in Automatic Document Processing, pp. 313–323. Prentice Hall, Englewood Cliffs (1971)Google Scholar
  4. 4.
    Machado, J.: Mitra: A Metadata Aware Web Search Engine for Digital Libraries: M.Sc. Thesis, Departamento de Engenharia Informática, Technical University of Lisbon (2008)Google Scholar
  5. 5.
    Robertson, S., Zaragoza, H., Taylor, M.: Simple BM25 extension to multiple weighted fields. In: Proceedings of the Thirteenth ACM international Conference on information and Knowledge Management, CIKM 2004, Washington, DC, USA, November 8-13, pp. 42–49. ACM, New York (2004)CrossRefGoogle Scholar
  6. 6.
    Ahn, D.D., Azzopardi, L., Balog, K., Fissaha, A.S., Jijkoun, V., Kamps, J., Müller, K., de Rijke, M., Sang, E.T.K.: The University of Amsterdam at TREC 2005. In: Working Notes for the 2005 Text Retrieval Conference (2005)Google Scholar
  7. 7.
    Pedrosa, G., Luzio, J., Manguinhas, H., Martins, B.: DIGMAP: A service for searching and browsing old maps. In: Proceedings of the 8th ACM/IEEE-CS Joint Conference on Digital Libraries, JCDL 2008, Pittsburgh, PA, USA, June 16-20, p. 431. ACM, New York (2008)Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • Jorge Machado
    • 1
  • Bruno Martins
    • 1
  • José Borbinha
    • 1
  1. 1.Departmento de Engenharia InformáticaTechnical University of LisbonPortugal

Personalised recommendations