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Seminar Details

Date 11-2-2010
Time 11:00
Room/Location DISI-Sala Conferenze 3 piano
Title Automatic determination of number of components in EM-algorithm for Gaussian mixtures
Speaker Dr. Dmitry Kropotov
Affiliation Dorodnicyn Computing Centre of the Russian Academy of Sciences (Moscow), Russia
Link https://www.disi.unige.it/index.php?eventsandseminars/seminars
Abstract The conventional EM-algorithm for Gaussian mixture restoration requires number of components to be given beforehand. Here we propose ARD EM algorithm for automatic determination of number of components in Gaussian mixture, based on Relevance Vector Machine approach. The idea is to use large enough number of components at the initial stage with further determination of relevant components by the model evidence maximization. Experiments on toy problems show that the obtained number of clusters equals or slightly exceeds the true one. Besides, ARD EM clustering result appears to be closer to the true one in comparison with analogues based on cross-validation and Minimal Description Length approach.
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