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  • python实现并绘制 sigmoid函数,tanh函数,ReLU函数,PReLU函数

    Python绘制正余弦函数图像

    
    # -*- coding:utf-8 -*-
    from matplotlib import pyplot as plt
    import numpy as np
    import mpl_toolkits.axisartist as axisartist
     
     
    def sigmoid(x):
        return 1. / (1 + np.exp(-x))
     
     
    def tanh(x):
        return (np.exp(x) - np.exp(-x)) / (np.exp(x) + np.exp(-x))
     
     
    def relu(x):
        return np.where(x<0,0,x)
     
     
    def prelu(x):
        return np.where(x<0,0.5*x,x)
     
    def plot_sigmoid():
        x = np.arange(-10, 10, 0.1)
        y = sigmoid(x)
        fig = plt.figure()
        # ax = fig.add_subplot(111)
        ax = axisartist.Subplot(fig,111)
        ax.spines['top'].set_color('none')
        ax.spines['right'].set_color('none')
        # ax.spines['bottom'].set_color('none')
        # ax.spines['left'].set_color('none')
        ax.axis['bottom'].set_axisline_style("-|>",size=1.5)
        ax.spines['left'].set_position(('data', 0))
        ax.plot(x, y)
        plt.xlim([-10.05, 10.05])
        plt.ylim([-0.02, 1.02])
        plt.tight_layout()
        plt.savefig("sigmoid.png")
        plt.show()
     
     
    def plot_tanh():
        x = np.arange(-10, 10, 0.1)
        y = tanh(x)
        fig = plt.figure()
        ax = fig.add_subplot(111)
        ax.spines['top'].set_color('none')
        ax.spines['right'].set_color('none')
        # ax.spines['bottom'].set_color('none')
        # ax.spines['left'].set_color('none')
        ax.spines['left'].set_position(('data', 0))
        ax.spines['bottom'].set_position(('data', 0))
        ax.plot(x, y)
        plt.xlim([-10.05, 10.05])
        plt.ylim([-1.02, 1.02])
        ax.set_yticks([-1.0, -0.5, 0.5, 1.0])
        ax.set_xticks([-10, -5, 5, 10])
        plt.tight_layout()
        plt.savefig("tanh.png")
        plt.show()
     
     
    def plot_relu():
        x = np.arange(-10, 10, 0.1)
        y = relu(x)
        fig = plt.figure()
        ax = fig.add_subplot(111)
        ax.spines['top'].set_color('none')
        ax.spines['right'].set_color('none')
        # ax.spines['bottom'].set_color('none')
        # ax.spines['left'].set_color('none')
        ax.spines['left'].set_position(('data', 0))
        ax.plot(x, y)
        plt.xlim([-10.05, 10.05])
        plt.ylim([0, 10.02])
        ax.set_yticks([2, 4, 6, 8, 10])
        plt.tight_layout()
        plt.savefig("relu.png")
        plt.show()
     
     
    def plot_prelu():
        x = np.arange(-10, 10, 0.1)
        y = prelu(x)
        fig = plt.figure()
        ax = fig.add_subplot(111)
        ax.spines['top'].set_color('none')
        ax.spines['right'].set_color('none')
        # ax.spines['bottom'].set_color('none')
        # ax.spines['left'].set_color('none')
        ax.spines['left'].set_position(('data', 0))
        ax.spines['bottom'].set_position(('data', 0))
        ax.plot(x, y)
        plt.xticks([])
        plt.yticks([])
        plt.tight_layout()
        plt.savefig("prelu.png")
        plt.show()
     
     
    if __name__ == "__main__":
        plot_sigmoid()
        plot_tanh()
        plot_relu()
        plot_prelu()
    
    
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  • 原文地址:https://www.cnblogs.com/qixidi/p/10189796.html
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