Microsoft Research Asia at the NTCIR-10 Intent Task

Microsoft Research Asia participated in the Subtopic Mining subtask and Document Ranking subtask of the NTCIR-10 INTENT Task. In the Subtopic Mining subtask, we mine subtopics from query suggestions, clickthrough data and top results of the queries, and rank them based on their importance for the given query. In the Document Ranking subtask, we diversify top search results by estimating the intent types of the mined subtopics and combining multiple search engine results. Experimental results show that our best Japanese subtopic mining run is ranked No. 2 of all 14 runs in terms of D -nDCG@10. All of our Japanese document ranking runs outperform the baseline ranking without diversification.