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Optical Engineering

Self-organizing optical neural network for unsupervised learning
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Paper Abstract

One of the features in neural computing must be the ability to adapt to a changeable environment and to recognize unknown objects. This paper deals with an adaptive optical neural network using Kohonen's self-organizing feature map algorithm for unsupervised learning. A compact optical neural network of 64 neurons using liquid crystal televisions is used for this study. To test the performance of the self-organizing neural network, experimental demonstrations and computer simulations are provided. Effects due to unsupervised learning parameters are analyzed. We show that the optical neural network is capable of performing both unsupervised learning and pattern recognition operations simultaneously, by setting two matching scores in the learning algorithm. By using a slower learning rate, the construction of the memory matrix becomes more organized topologically. Moreover, the introduction of forbidden regions in the memory space enables the neural network to learn new patterns without erasing the old ones.

Paper Details

Date Published: 1 September 1990
PDF: 7 pages
Opt. Eng. 29(9) doi: 10.1117/12.55702
Published in: Optical Engineering Volume 29, Issue 9
Show Author Affiliations
Thomas Taiwei Lu, Photonics Research (United States)
Francis T. S. Yu, The Pennsylvania State Univ. (United States)
Don A. Gregory, U.S. Army Missile Command (United States)

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