The Eleventh ACM SIGKDD International Conference on Knowledge Discovery and Data Mining

August 21-24, 2005
Chicago, IL

Pictures of Aparna and her session attendees.

Title of Paper Presented:

Learning Semantics-Preserving Distance Metrics for Clustering Graphical Data

Authors

Aparna S. Varde, Elke A. Rundensteiner, Carolina Ruiz, Mohammed Maniruzzaman and Richard D. Sisson Jr.

Published: In Proceedings of MDM/KDD2005, The Sixth International Workshop on Multimedia Data Mining, "Mining Integrated Media and Complex Data".

Abstract:

In mining graphical data the default Euclidean distance is often used as a notion of similarity. However this does not adequately capture semantics in our targeted domains, having graphical representations depicting results of scientific experiments. It is seldom known a-priori what other distance metric best preserves semantics. This motivates the need to learn such a metric. A technique called LearnMet is proposed here to learn a domain-specific distance metric for graphical representations. Input to LearnMet is a training set of correct clusters of such graphs. LearnMet iteratively compares these correct clusters with those obtained from an arbitrary but fixed clustering algorithm. In the first iteration a guessed metric is used for clustering. This metric is then refined using the error between the obtained and correct clusters until the error is below a given threshold. LearnMet is evaluated rigorously in the Heat Treating domain which motivated this research. Clusters obtained using the learned metric and clusters obtained using Euclidean distance are both compared against the correct clusters over a separate test set. Our results show that the learned metric provides better clusters.

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Last modified: Nov 02, 2005, 13:48 EST