Accuracy Analysis of Node Activation Function Based on Hardware Implementation of Artificial Neural Network

One of the difficulties encountered in realizing artificial neural network based on VLSI is the choice of the implementation method of activation function. At present, the main approaches to solve this problem are piecewise nonlinear approximation and bit level mapping. Based on hyperbolic tangent, the final output error of the two methods is discussed through the hardware implementation and software analysis of the artificial neural network nodes. We found that the nonlinear approximation method has the problem of large output fluctuation, and the amplification effect of the backpropagation can not be ignored. Therefore, this paper proposes that the bit level mapping method has more advantages in practical applications in the implementation of high-precision artificial neural nodes.