An efficient quantum neuro-fuzzy classifier based on fuzzy entropy and compensatory operation

Authors:
Cheng-Hung Chen;Cheng-Jian Lin;Chin-Teng Lin
Affiliations:
National Chiao-Tung University, Department of Electrical and Control Engineering, 300, Hsinchu, Taiwan, ROC;National University of Kaohsiung, Department of Electrical Engineering, 811, Kaohsiung, Taiwan, ROC;National Chiao-Tung University, Department of Electrical and Control Engineering, 300, Hsinchu, Taiwan, ROC
Venue:
Soft Computing - A Fusion of Foundations, Methodologies and Applications
Year:
2008

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Abstract

In this paper, a quantum neuro-fuzzy classifier (QNFC) for classification applications is proposed. The proposed QNFC model is a five-layer structure, which combines the compensatory-based fuzzy reasoning method with the traditional Takagi–Sugeno–Kang (TSK) fuzzy model. The compensatory-based fuzzy reasoning method uses adaptive fuzzy operations of neuro-fuzzy systems that can make the fuzzy logic system more adaptive and effective. Layer 2 of the QNFC model contains quantum membership functions, which are multilevel activation functions. Each quantum membership function is composed of the sum of sigmoid functions shifted by quantum intervals. A self-constructing learning algorithm, which consists of the self-clustering algorithm (SCA), quantum fuzzy entropy and the backpropagation algorithm, is also proposed. The proposed SCA method is a fast, one-pass algorithm that dynamically estimates the number of clusters in an input data space. Quantum fuzzy entropy is employed to evaluate the information on pattern distribution in the pattern space. With this information, we can determine the number of quantum levels. The backpropagation algorithm is used to tune the adjustable parameters. The simulation results have shown that (1) the QNFC model converges quickly; (2) the QNFC model has a higher correct classification rate than other models.