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Providing Diversity in K-Nearest Neighbor Query Results

Jain, Anoop and Sarda, Parag and Haritsa, Jayant R (2004) Providing Diversity in K-Nearest Neighbor Query Results. In: 8th Pacific-Asia Conference:PAKDD 2004(Lecture Notes in Computer Science), May 26-28, 2004, Sydney, Australia, Vol.3056, 404-413.

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Given a point query Q in multi-dimensional space, K-Nearest Neighbor (KNN) queries return the K closest answers in the database with respect to Q. In this scenario, it is possible that a majority of the answers may be very similar to one or more of the other answers, especially when the data has clusters. For a variety of applications, such homogeneous result sets may not add value to the user. In this paper, we consider the problem of providing diversity in the results of KNN queries, that is, to produce the closest result set such that each answer is sufficiently different from the rest. We first propose a user-tunable definition of diversity, and then present an algorithm, called MOTLEY, for producing a diverse result set as per this definition. Through a detailed experimental evaluation we show that MOTLEY can produce diverse result sets by reading only a small fraction of the tuples in the database. Further, it imposes no additional overhead on the evaluation of traditional KNN queries, thereby providing a seamless interface between diversity and distance.

Item Type: Conference Paper
Publication: 8th Pacific-Asia Conference, PAKDD 2004, Sydney, Australia (Lecture Notes in Computer Science)
Publisher: Springer
Additional Information: Copyright of this article belongs to Springer.
Keywords: Nearest Neighbor;Distance Browsing;Result Diversity
Department/Centre: Division of Interdisciplinary Sciences > Supercomputer Education & Research Centre
Division of Electrical Sciences > Computer Science & Automation
Date Deposited: 18 May 2007
Last Modified: 19 Sep 2010 04:35
URI: http://eprints.iisc.ac.in/id/eprint/10076

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