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A Theory of Adaptive Pattern Classifiers

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1 Author(s)
Amari, Shunichi ; Dept. Commun. Engrg., Kyushu University, Fukuoka, Japan.

This paper describes error-correction adjustment procedures for determining the weight vector of linear pattern classifiers under general pattern distribution. It is mainly aimed at clarifying theoretically the performance of adaptive pattern classifiers. In the case where the loss depends on the distance between a pattern vector and a decision boundary and where the average risk function is unimodal, it is proved that, by the procedures proposed here, the weight vector converges to the optimal one even under nonseparable pattern distributions. The speed and the accuracy of convergence are analyzed, and it is shown that there is an important tradeoff between speed and accuracy of convergence. Dynamical behaviors, when the probability distributions of patterns are changing, are also shown. The theory is generalized and made applicable to the case with general discriminant functions, including piecewise-linear discriminant functions.

Published in:

Electronic Computers, IEEE Transactions on  (Volume:EC-16 ,  Issue: 3 )

Date of Publication:

June 1967

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