This paper proposes a kind of unsupervised learning neural network model, which has special structure and can realize an evaluation and classification of many groups by the compression of data and the reduction of dimension. The main characteristics of the samples are learned after being trained. In order to realize unsupervised learning of neural network structure with convex constraint, an iterative computation method is proposed that makes use of alternating projection between two convex sets. The final example proves that this method can detect instructions without a mass of supervised data and it converges fast. © 2007 Elsevier B.V. All rights reserved.
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