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Indexed by:期刊论文

Date of Publication:2011-01-01

Journal:NEURAL NETWORKS

Included Journals:SCIE、EI、PubMed、Scopus

Volume:24

Issue:1

Page Number:91-98

ISSN No.:0893-6080

Key Words:Neural networks; Backpropagation learning; Online gradient method; Weak convergence; Strong convergence

Abstract:This paper considers a class of online gradient learning methods for backpropagation (BP) neural networks with a single hidden layer. We assume that in each training cycle, each sample in the training set is supplied in a stochastic order to the network exactly once. It is interesting that these stochastic learning methods can be shown to be deterministically convergent. This paper presents some weak and strong convergence results for the learning methods, indicating that the gradient of the error function goes to zero and the weight sequence goes to a fixed point, respectively. The conditions on the activation function and the learning rate to guarantee the convergence are relaxed compared with the existing results. Our convergence results are valid for not only S-S type neural networks (both the output and hidden neurons are Sigmoid functions), but also for P-P, P-S and S-P type neural networks, where S and P represent Sigmoid and polynomial functions, respectively. (C) 2010 Elsevier Ltd. All rights reserved.