Microsoft Research Asia at the Web Track of TREC 2009
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TL;DR
The experimental results show that the model improves diversity of search results in terms of α-NDCG, and combining subtopics from multiple data sources helps further improve result diversity.
Abstract
In TREC 2009, we participate in the Web track, and focus on the diversity task. We propose to diversify web search results by first mining subtopics, and then rank results based on mined subtopics. We propose a model to diversify search results by considering both relevance of documents and richness of mined subtopics. Our experimental results show that the model improves diversity of search results in terms of α-NDCG, and combining subtopics from multiple data sources helps further improve result diversity. 1.