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Dipartimento di Elettronica, Informatica e Sistemistica

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Fuzzy Sets of Rules for System Identification

R. Rovatti and R. Guerrieri


The synthesis of fuzzy systems involves the identification of a structure and its specialization by means of parameter optimization. In doing this, symbolic approaches which encode the structure information in the form of high-level rules allow further manipulation of the system to minimize its complexity and possibly its implementation cost while all-parametric methodologies often achieve better approximation performance. In this paper we rely on the concept of fuzzy set of rules to tackle the rule induction problem at an intermediate level. An on-line adaptive algorithm is developed which almost surely learns the extent to which inclusion of a rule in the rule set significantly contributes to the reproduction of the target behavior. Then, the resulting fuzzy set of rules can be defuzzified to give a conventional rule set with similar behavior. Comparisons with high-level and low-level methodologies show that this approach retains most positive features of both.

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