Producing interpretable local models in parametric CMAC by regularization

Authors:
John Q. Gan;Eric M. Rosales
Affiliations:
(Correspd. E-mail: jqgan@essex.ac.uk) Department of Computer Science, University of Essex, Colchester CO4 3SQ, UK;Department of Computer Science, University of Essex, Colchester CO4 3SQ, UK
Venue:
International Journal of Knowledge-based and Intelligent Engineering Systems
Year:
2007

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Abstract

Cerebellar model articulation controller (CMAC) has been widely applied to modeling and control due to its attractive features such as fast training speed and parsimonious structure. A parametric CMAC is a CMAC model with its constant weights replaced by linear functional weights or linear local models, i.e., a type of Tagaki-Sugeno fuzzy model. This paper proposes a regularized parametric CMAC, and investigates how its linear local models are able to approximate the local linearity of the nonlinear system to be modeled by using regularization techniques and how the regularized parametric CMAC can be successfully applied in modeling a nonlinear process for state estimation of unknown nonlinear processes. Experimental results on the approximation ability and interpretability of the regularized parametric CMAC and its application to nonlinear state estimation have been presented to demonstrate the advantages of the regularized parametric CMAC.