Unsupervised feature and model selection for generalized Dirichlet mixture models

Authors:
Sabri Boutemedjet;Nizar Bouguila;Djemel Ziou
Affiliations:
Département d'informatique, Université de Sherbrooke, QC, Canada;Concordia Institute for Information Systems Engineering, Concordia University, Montreal, QC, Canada;Département d'informatique, Université de Sherbrooke, QC, Canada
Venue:
ICIAR'07 Proceedings of the 4th international conference on Image Analysis and Recognition
Year:
2007

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Abstract

We present in this paper a new approach for unsupervised feature selection for non Gaussian data controlled by a finite mixture of generalized Dirichlet distributions. We model each feature by a mixture of two Beta distributions: one relevant and depends on component labels while the second distribution is uninformative for the clustering. The relevance of each feature is then quantified by the mixture weight associated to the relevant Beta distribution. Experiments in summarizing image collections have shown the merits of our approach.