Improving the performance of the RBF neural networks trained with imbalanced samples

Authors:
R. Alejo;V. García;J. M. Sotoca;R. A. Mollineda;J. S. Sánchez
Affiliations:
Dept. Llenguatges i Sistemes Informàtics, Universitat Jaume I, Castelló de la Plana, Spain and Lab. de Reconocimiento de Patrones, Instituto Tecnológico de Toluca, Metepec, Mexico;Dept. Llenguatges i Sistemes Informàtics, Universitat Jaume I, Castelló de la Plana, Spain and Lab. de Reconocimiento de Patrones, Instituto Tecnológico de Toluca, Metepec, Mexico;Dept. Llenguatges i Sistemes Informàtics, Universitat Jaume I, Castelló de la Plana, Spain;Dept. Llenguatges i Sistemes Informàtics, Universitat Jaume I, Castelló de la Plana, Spain;Dept. Llenguatges i Sistemes Informàtics, Universitat Jaume I, Castelló de la Plana, Spain
Venue:
IWANN'07 Proceedings of the 9th international work conference on Artificial neural networks
Year:
2007

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Abstract

Recently, the class imbalance problem in neural networks, is receiving growing attention in works of machine learning and data mining. This problem appears when the samples of some classes are much smaller than those in the other classes. The classes with small size can be ignored in the learning process and the convergence of these classes is very slow. This paper studies empirically the class imbalance problem in the context of the RBF neural network trained with backpropagation algorithm. We propose to introduce a cost function in the training process to compensate imbalance class and one strategy to reduce the impact of the cost function in the data probability distribution.