SPIDER Retrieval System at TREC-5.
Jean Paul Ballerini, Marco Büchel, Ruxandra Domenig, Daniel Knaus, Bojidar Mateev, Elke Mittendorf, Peter Scháuble, Páraic Sheridan, Martin Wechsler · 1996
The ETH group participated in this year`s TREC in the following tracks: automatic adhoc (long and short), the manual adhoc, routing, and confusion. We also did some experiments on the chinese data which were not submitted. While for adhoc we relied mainly on methods which were well evaluated in previous TRECs, we successfully tried completely new techniques for the routing task and the confusion task: for routing we found an optimal feature selection method and included co-occurrence data into the retrieval function; for confusion we applied a robust probabilistic technique for estimating feature frequencies. 1 Introduction ETH's contribution to TREC-5 consists of a new routing approach and robust probabilistic technique for the confusion track. Both approaches have been tuned by means of an essentially known reference method (Lnu.ltn, phrase indexing, query expansion). For comparison reasons, this reference method has been applied to the adhoc task and the results were submitted as o...