RELU-Function and Derived Function Review

The activation function plays an important role in training and improving performance in deep neural networks (dnn). The rectified linear unit (relu) function provides the necessary non-linear properties in the deep neural network (dnn). However, few papers sort out and compare various relu activation functions. Most of the paper focuses on the efficiency and accuracy of certain activation functions used by the model, but does not pay attention to the nature and differences of these activation functions. Therefore, this paper attempts to organize the RELU-function and derived function in this paper. And compared the accuracy of different relu functions (and its derivative functions) under the Mnist data set. From the experimental point of view, the relu function performs the best, and the selu and elu functions perform poorly.