The Class Imbalance Problem in UCS Classifier System: A Preliminary Study
3 September 2006by Albert Orriols-Puig and Ester Bernadó-Mansilla. Advances at the frontier of LCS. Springer 2006 (in press).
The class imbalance problem has been said recently to hinder the performance of learning systems. In fact, many of them are designed with the assumption of well-balanced datasets. But this commitment is not always true, since it is very common to find higher presence of one of the classes in real classification problems. The aim of this paper is to make a preliminary analysis on the effect of the class imbalance problem
in learning classifier systems. Particularly we focus our study on UCS, a supervised version of XCS classifier system. We analyze UCS’s behavior on unbalanced datasets and find that UCS is sensitive to high levels of class imbalance. We study strategies for dealing with class imbalances, acting either at the sampling level or at the classifier system’s level.
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