Performance Improvement of Backpropagation Algorithm by Automatic Tuning of Learning Rate using Fuzzy Logic System

  • Jung, Kyung-Kwon (Department of Electronic Engineering, Dongguk University) ;
  • Lim, Joong-Kyu (Department of Electronic Engineering, Dongguk Universit) ;
  • Chung, Sung-Boo (Department of Electronic Engineering, Seoil Colleg) ;
  • Eom, Ki-Hwan (Department of Electronic Engineering, Dongguk University)
  • Published : 2003.09.01


We propose a learning method for improving the performance of the backpropagation algorithm. The proposed method is using a fuzzy logic system for automatic tuning of the learning rate of each weight. Instead of choosing a fixed learning rate, the fuzzy logic system is used to dynamically adjust the learning rate. The inputs of fuzzy logic system are delta and delta bar, and the output of fuzzy logic system is the learning rate. In order to verify the effectiveness of the proposed method, we performed simulations on the XOR problem, character classification, and function approximation. The results show that the proposed method considerably improves the performance compared to the general backpropagation, the backpropagation with momentum, and the Jacobs'delta-bar-delta algorithm.


Backpropagation;Fuzzy logic system;Automatic tuning of learning rate;Delta-bar-delta


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