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Characterizing Search Intent Diversity into Click Models

posted Oct 23, 2011, 4:47 PM by Botao Hu   [ updated Oct 26, 2011, 5:48 AM ]
First Author and Experiment Conductor
Mar 2010 - May 2010
Coauthored with Yuchen Zhang.
Supervised by Gang Wang, Weizhu Chen, Qiang Yang.
Microsoft Research Asia, Beijing
In Proceedings of WWW 2011

Modeling a user's click-through behavior in click logs is a challenging task due to the well-known position bias problem. Recent advances in click models have adopted the examination hypothesis which distinguishes document relevance from position bias. In this paper, we revisit the examination hypothesis and observe that user clicks cannot be completely explained by relevance and position bias. Speci.cally, users with different search intents may submit the same query to the search engine but expect different search results. Thus, there might be a bias between user search intent and the query formulated by the user, which can lead to the diversity in user clicks. This bias has not been considered in previous works such as UBM, DBN and CCM. In this paper, we propose a new intent hypothesis as a complement to the examination hypothesis. This hypothesis is used to characterize the bias between the user search intent and the query in each search session. This hypothesis is very general and can be applied to most of the existing click models to improve their capacities in learning unbiased relevance. Experimental results demonstrate that after adopting the intent hypothesis, click models can better interpret user clicks and achieve a significant NDCG improvement.

Botao Hu,
Oct 24, 2011, 8:08 PM
Botao Hu,
Oct 24, 2011, 8:09 PM