A weight adaptation method for fuzzy cognitive map learning

Authors:
I. Papageorgiou;P. Groumpos
Affiliations:
Department of Electrical & Computer Engineering, Laboratory for Automation and Robotics, Artificial Intelligence Research Center (UPAIRC), University of Patras, 26500, Rion, Greece;Department of Electrical & Computer Engineering, Laboratory for Automation and Robotics, Artificial Intelligence Research Center (UPAIRC), University of Patras, 26500, Rion, Greece
Venue:
Soft Computing - A Fusion of Foundations, Methodologies and Applications
Year:
2005

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Abstract

Fuzzy cognitive maps (FCMs) constitute an attractive modeling approach that encompasses advantageous features. The most pronounces are the flexibility in system design, model and control, the comprehensive operation and the abstractive representation of complex systems. The main deficiencies of FCMs are the critical dependence on the initial expert’s beliefs, the recalculation of the weights corresponding to each concept every time a new strategy is adopted and the potential convergence to undesired equilibrium states. In order to update the initial knowledge of human experts and to combine the human experts’ structural knowledge with the training from data, a learning methodology for FCMs is proposed. This learning method, based on nonlinear Hebbian-type learning algorithm, is used to adapt the cause–effect relationships of the FCM model improving the efficiency and robustness of FCMs. A process control problem is presented and its process is investigated using the proposed weight adaptation technique.