UCLA-Okapi at TREC-2: query expansion experiments
Efthimis N. Efthimiadis, Paul V. Biron · 1993
Introduction This is the first participation of the Graduate School of Library and Information Science, University of California at Los Angeles in the TREC Conference. For TREC--2, Category B, UCLA used a version of the Okapi text retrieval system that was made available to UCLA by City University, London, UK. OKAPI has been described in TREC1 (Robertson, Walker, Hancock-Beaulieu, Gull & Lau, 1993a) as well as in this conference (Robertson, Walker, Jones, Hancock-Beaulieu, & Gatford, 1994) . Okapi is a simple set-oriented system based on a generalized probabilistic model with facilities for relevance feedback. In addition OKAPI supports a full range of deterministic Boolean and quasi-Boolean operations. 1.1 Objectives The main research objective of the UCLA participation in TREC--2 was to investigate query expansion within the framework as provided by Okapi. More specifically, the objectives were to: ffl use an enhanced version of the Go-See-Li