Constructive approximation to multivariate function by decay RBF neural network

Authors:
Muzhou Hou;Xuli Han
Affiliations:
School of Mathematical Sciences and Computing Technology, Central South University, Changsha, China and School of Information Science and Engineering, Central South University, Changsha, China;School of Mathematical Sciences and Computing Technology, Central South University, Changsha, China
Venue:
IEEE Transactions on Neural Networks
Year:
2010

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Abstract

It is well known that single hidden layer feedforward networks with radial basis function (RBF) kernels are universal approximators when all the parameters of the networks are obtained through all kinds of algorithms. However, as observed in most neural network implementations, tuning all the parameters of the network may cause learning complicated, poor generalization, overtraining and unstable. Unlike conventional neural network theories, this brief gives a constructive proof for the fact that a decay RBF neural network with n + 1 hidden neurons can interpolate n + 1 multivariate samples with zero error. Then we prove that the given decay RBFs can uniformly approximate any continuous multivariate functions with arbitrary precision without training. The faster convergence and better generalization performance than conventional RBF algorithm, BP algorithm, extreme learning machine and support vector machines are shown by means of two numerical experiments.