Pseudo Relevance Feedback(PRF)mechanism is an automated Query Expansion(QE)technology that uses the original query and the information contained in the top N documents in the initial retrieval to build more accurate queries.It can further improve the performance of retr...MORE Pseudo Relevance Feedback(PRF)mechanism is an automated Query Expansion(QE)technology that uses the original query and the information contained in the top N documents in the initial retrieval to build more accurate queries.It can further improve the performance of retrieval systems.However,the existing PRF methods for d...