Indexing half a billion web pages

by Claudia Hauff and Djoerd Hiemstra

The University of Twente participated in three tasks of TREC 2009: the adhoc task, the diversity task and the relevance feedback task. All experiments are performed on the English part of ClueWeb09. In this draft paper, we describe our approach to tuning our retrieval system in absence of training data in Section 3. We describe the use of categories and a query log for diversifying search results in Section 4. Section 5 describes preliminary results for the relevance feedback task.

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