Local identification of prototypes for genetic learning of accurate TSK fuzzy rule-based systems: Research Articles

Authors:
R. Alcalá;J. Alcalá-Fdez;J. Casillas;O. Cordón;F. Herrera
Affiliations:
University of Granada, Department of Computer Science and Artificial Intelligence, 18071 Granada, Spain;University of Granada, Department of Computer Science and Artificial Intelligence, 18071 Granada, Spain;University of Granada, Department of Computer Science and Artificial Intelligence, 18071 Granada, Spain;University of Granada, Department of Computer Science and Artificial Intelligence, 18071 Granada, Spain;University of Granada, Department of Computer Science and Artificial Intelligence, 18071 Granada, Spain
Venue:
International Journal of Intelligent Systems
Year:
2007

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Abstract

This work presents the use of local fuzzy prototypes as a new idea to obtain accurate local semantics-based Takagi–Sugeno–Kang (TSK) rules. This allow us to start from prototypes considering the interaction between input and output variables and taking into account the fuzzy nature of the TSK rules. To do so, a two-stage evolutionary algorithm based on MOGUL (a methodology to obtain Genetic Fuzzy Rule-Based Systems under the Iterative Rule Learning approach) has been developed to consider the interaction between input and output variables. The first stage performs a local identification of prototypes to obtain a set of initial local semantics-based TSK rules, following the Iterative Rule Learning approach and based on an evolutionary generation process within MOGUL (taking as a base some initial linguistic fuzzy partitions). Because this generation method induces competition among the fuzzy rules, a postprocessing stage to improve the global system performance is needed. Two different processes are considered at this stage, a genetic niching-based selection process to remove redundant rules and a genetic tuning process to refine the fuzzy model parameters. The proposal has been tested with two real-world problems, achieving good results. © 2007 Wiley Periodicals, Inc. Int J Int Syst 22: 909–941, 2007.