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An Adaptive Input Data Space Parting Solution to the Synthesis of Neuro-Fuzzy Models

Sy Dzung Nguyen and Kieu Nhi Ngo
International Journal of Control, Automation, and Systems, vol. 6, no. 6, pp.928-938, 2008

Abstract : This study presents an approach for approximation an unknown function from a numerical data set based on the synthesis of a neuro-fuzzy model. An adaptive input data space parting method, which is used for building hyperbox-shaped clusters in the input data space, is proposed. Each data cluster is implemented here as a fuzzy set using a membership function MF with a hyperbox core that is constructed from a min vertex and a max vertex. The focus of interest in proposed approach is to increase degree of fit between characteristics of the given numerical data set and the established fuzzy sets used to approximate it. A new cutting procedure, named NCP, is proposed. The NCP is an adaptive cutting procedure using a pure function Ψ and a penalty function τ for direction the input data space parting process. New algorithms named CSHL, HLM1 and HLM2 are presented. The first new algorithm, CSHL, built based on the cutting procedure NCP, is used to create hyperbox-shaped data clusters. The second and the third algorithm are used to establish adaptive neuro-fuzzy inference systems. A series of numerical experiments are performed to assess the efficiency of the proposed approach.

Keyword : Fuzzy set, hyperbox-shaped cluster, hyperplane-shaped cluster, min-max hyperbox, neuro-fuzzy inference systems.

 
 
 
 
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