Abstract
The neural network with two weights is constructed and its approximation ability to any continuous functions is proved. For this neural network, the activation function is not confined to the odd functions. We prove that it can limitlessly approach any continuous function from limited close subset of R m to R n and any continuous function, which has limit at infinite place, from limitless close subset of R m to R n. This extends the nonlinear approximation ability of traditional BP neural network and RBF neural network.
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