Abstract
The main aim of the paper is to illustrate the tradeoff between the performance of a fuzzy rule based classification system and its size (i.e., the number of fuzzy if-then rules) through computer simulations on commonly used data sets. In our computer simulations, we use a simple heuristic method for generating fuzzy if-then rules from training patterns, in which a pattern space is homogeneously partitioned into fuzzy subspaces by subdividing each axis into linguistic values. For clearly illustrating the tradeoff, we use a genetic algorithm based rule selection method with two objectives: to minimize the number of fuzzy if-then rules and to maximize the classification performance. Various fuzzy rule based classification systems with different sizes are generated by the rule selection method for each data set.
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