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Generative Supervised Classification Using Dirichlet Process Priors

Davy, Manuel and Tourneret, Jean-Yves Generative Supervised Classification Using Dirichlet Process Priors. (2010) IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. 3 (n° 10 ). pp. 1781-1794 . ISSN 0162-8828

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Official URL: http://dx.doi.org/10.1109/TPAMI.2010.21

Abstract

Choosing the appropriate parameter prior distributions associated to a given Bayesian model is a challenging problem. Conjugate priors can be selected for simplicity motivations. However, conjugate priors can be too restrictive to accurately model the available prior information. This paper studies a new generative supervised classifier which assumes that the parameter prior distributions conditioned on each class are mixtures of Dirichlet processes. The motivations for using mixtures of Dirichlet processes is their known ability to model accurately a large class of probability distributions. A Monte Carlo method allowing one to sample according to the resulting class-conditional posterior distributions is then studied. The parameters appearing in the class-conditional densities can then be estimated using these generated samples (following Bayesian learning). The proposed supervised classifier is applied to the classification of altimetric waveforms backscattered from different surfaces (oceans, ices, forests, and deserts). This classification is a first step before developing tools allowing for the extraction of useful geophysical information from altimetric waveforms backscattered from nonoceanic surfaces.

Item Type:Article
Additional Information:Thanks to IEEE Comuter Society editor. The definitive version is available at http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5396337&tag=1
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Université de Toulouse I-Sciences Sociales - UT1
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Université de Toulouse > Université de Toulouse II-Le Mirail - UTM
Laboratory name:
Statistics:download
Deposited By:Jean-yves TOURNERET

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