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Evolutionary fuzzy modeling
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DOI：10.1109/TFUZZ.2003.817853.png)
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Abstract
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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.
Keywords:
evolutionary computing
fuzzy models
fuzzy neurons
genetic programming (GP)
learning logic architectures
rule-based computing
transparency
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