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This article evaluates the performance of two techniques for queryreformulation in a system for information retrieval, namely, the concept basedand the pseudo relevance feedback reformulation. The experiments performed on acorpus of Arabic text have allowed us to compare the contribution of these tworeformulation techniques in improving the performance of an informationretrieval system for Arabic texts.

Concept Based vs. Pseudo Relevance Feedback Performance Evaluation for Information Retrieval System