Robust learning of mixture models and its application on trial pruning for EEG signal analysis

Authors:
Boyu Wang;Feng Wan;Peng Un Mak;Pui In Mak;Mang I Vai
Affiliations:
Department of Electrical and Electronics Engineering, Faculty of Science and Technology, University of Macau, China;Department of Electrical and Electronics Engineering, Faculty of Science and Technology, University of Macau, China;Department of Electrical and Electronics Engineering, Faculty of Science and Technology, University of Macau, China;Department of Electrical and Electronics Engineering, Faculty of Science and Technology, University of Macau, China;Department of Electrical and Electronics Engineering, Faculty of Science and Technology, University of Macau, China
Venue:
PAKDD'11 Proceedings of the 15th international conference on New Frontiers in Applied Data Mining
Year:
2011

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Abstract

This paper presents a novel method based on deterministic annealing to circumvent the problem of the sensitivity to atypical observations associated with the maximum likelihood (ML) estimator via conventional EM algorithm for mixture models. In order to learn the mixture models in a robust way, the parameters of mixture model are estimated by trimmed likelihood estimator (TLE), and the learning process is controlled by temperature based on the principle of maximum entropy. Moreover, we apply the proposed method to the single-trial electroencephalography (EEG) classification task. The motivation of this work is to eliminate the negative effects of artifacts in EEG data, which usually exist in real-life environments, and the experimental results demonstrate that the proposed method can successfully detect the outliers and therefore achieve more reliable result.