Query Expansion by Pseudo Relevance Feedback
نویسنده
چکیده
In this document, we describe our algorithms for automatic query expansion. The proposed algorithms are implemented in Java where the Lucene library 1 is modified and used by the proposed algorithms for document retrieval. In order to support accurate document retrieval, we have implemented the okapi(BM25) formulation 2 for measuring the document-query similarity measure. Three query expansion methods are studied and implemented in the attached software, including query expansion based on pseudo relevance feed back [1], query expansion using documents returned by Google search engine, and query expansion using the synonym sets defined by WordNet 3. The rest document is organized as follows: Section 2 describes the Okapi (BM25) formulation for document-query similarity measure, Section 3 describes different approaches for query expansion, and Section 4 presents the evaluation results for the developed approaches for query expansion.
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