Combinaison de ressources générales pour une contextualisation implicite de requêtes (Query Contextualization and Reformulation by Combining External Corpora) [in French]

Query Contextualization and Reformulation by Combining External Corpora Improving document retrieval using external sources of information has been extensively studied throughout the past. Improvements with either structured or large corpora have been reported. However, in these studies resources are often used separately and rarely combined together. We present an evaluation of the combination of four different scalable corpora over a web search task. An informative divergence measure is used to extract contextual features from the corpora and improve query representation. We use the ClueWeb09 collection along with TREC’s Web Track topics for the purpose of our evaluation. Best results are achieved when combining all four corpora, and are significantly better than the results of other approaches. MOTS-CLÉS : Combinaison de ressources, RI contextuelle, recherche web.