Sequential EM for Unsupervised Adaptive Gaussian Mixture Model Based Classifier

Authors:
Bashar Awwad Shiekh Hasan;John Q. Gan
Affiliations:
School of Computer Science and Electronic Engineering, University of Essex, UK CO4 3SQ;School of Computer Science and Electronic Engineering, University of Essex, UK CO4 3SQ
Venue:
MLDM '09 Proceedings of the 6th International Conference on Machine Learning and Data Mining in Pattern Recognition
Year:
2009

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Abstract

In this paper we present a sequential expectation maximization algorithm to adapt in an unsupervised manner a Gaussian mixture model for a classification problem. The goal is to adapt the Gaussian mixture model to cope with the non-stationarity in the data to classify and hence preserve the classification accuracy. Experimental results on synthetic data show that this method is able to learn the time-varying statistical features in data by adapting a Gaussian mixture model online. In order to control the adaptation method and to ensure the stability of the adapted model, we introduce an index to detect when the adaptation would fail.