Chaos and Neural Network Learning. Some Observations

  • Authors:
  • K. Bertels;L. Neuberg;S. Vassiliadis;D. G. Pechanek

  • Affiliations:
  • University of Namur, dept. of Business, Administration, Rempart de la Vierge 8, 5000 Namur, Belgium;University of Namur, dept. of Business, Administration, Rempart de la Vierge 8, 5000 Namur, Belgium;T.U. Delft, Electrical Engineering Department, Mekelweg 4, 2628 CD Delft, The Netherlands;IBM Microelectronics Division, Research Triangle Park, North Carolina 27709, USA E-mail: bertels@chaos.eco.fundp.ac.be

  • Venue:
  • Neural Processing Letters
  • Year:
  • 1998

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Abstract

In this paper, we investigate the impact of chaos on the learningprocess of the XOR-boolean function by backpropagation neural networks. Ithas been shown previously that such networks exhibit chaotic behavior butit has never been studied whether chaos enhances or prohibits learning. Weshow that chaos (when learning the XOR-boolean function) does indeed allowlearning but our findings do not indicate any positive role of chaos forlearning. In particular, we found that the temperature parameter in thebackpropagation algorithm causes the parameter regime, as represented by means of a bifurcation diagram, to shift to the right. We furthermore foundthat as less chaos appears during the learning process, the faster, on theaverage, a neural network learned the XOR-function.