python ReLU函数是什么

import numpy as np

import matplotlib.pyplot as plot

def relu(x):

    return np.maximum(0, x)

if __name__ == "__main__":

    a = np.arange(-20, 20, 0.1)

    b = relu(a)

    plot.plot(a, b, label="ReLU", color="red")

    plot.legend()

    plot.grid()

    plot.show()