Evolutionary fuzzy modeling

Authors:
W. Pedrycz;M. Reformat
Affiliations:
Dept. of Electr. & Comput. Eng., Univ. of Alberta, Edmonton, Alta., Canada;-
Venue:
IEEE Transactions on Fuzzy Systems
Year:
2003

Citing 0
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Abstract

This study is concerned with a general methodology of identification of fuzzy models. Unlike numeric models, fuzzy models operate at a level of information granules - fuzzy sets - and this aspect brings up an important design requirement of transparency of the model. We propose a three-phase development framework by distinguishing between structural and parametric optimization processes. The underlying topology of the model dwells on fuzzy neural networks - architectures governed by fuzzy logic and equipped with parametric flexibility. Two general optimization mechanisms are explored: the structural optimization is realized via genetic programming whereas for the ensuing detailed parametric optimization we proceed with gradient-based learning. The main advantages of this approach are discussed in detail. The study is illustrated with the aid of a numeric example that provides a detailed insight into the performance of the fuzzy models and quantifies crucial design issues.