Optical Realizations of Self-Organizing Neural Networks
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Among the architectures and algorithms suggested for neural network implementations, the self-organizing map (see section 2.4 and ) has the property of creating spatially organized internal representations of various input signals or patterns. It does this by taking the spatial neighbourhood of the cells into account during learning. In its basic version a cell or a group of cells becomes specifically tuned to various input patterns or classes of input patterns through an unsupervised learning process. The spatial location of a cell in the network corresponds to a particular set of input patterns. The spatial clustering of the cells and their organization into topologically related subsets then result in a high degree of classification efficiency. This is particularly relevant in cases in which no a priori information about the scaling of the problem is known, a fact that argues strongly in favour of the use of an optically addressable, continuous adaptive medium for implementation of the neural activity.
KeywordsInput Pattern Reference Beam Competitive Learning Photorefractive Crystal Neural Firing
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