欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页

python 画sigmoid、tanh、relu和ELU等**函数

程序员文章站 2022-05-22 11:23:17
...

 

1、前言

      写毕业论文时候画了**函数的函数图,也是参考别人的代码做的,我将格式统一了一些,现在分享出来。

2、代码

      2.1 sigmoid和tanh

import math
import matplotlib.pyplot as plt
import numpy as np
import matplotlib as mpl
mpl.rcParams['axes.unicode_minus'] = False

def sigmoid(x):
    result = 1/(1+math.e**(-x))
    return result

fig = plt.figure(figsize=(10,4))
ax = fig.add_subplot(121)
x = np.linspace(-10,10)
y = sigmoid(x)

ax.spines['top'].set_color('none')  
ax.spines['right'].set_color('none')  

ax.xaxis.set_ticks_position('bottom')  
ax.spines['bottom'].set_position(('data',0))  
ax.set_xticks([-10,-5,0,5,10])  
ax.yaxis.set_ticks_position('left')  
ax.spines['left'].set_position(('data',0))  
ax.set_yticks([-1,-0.5,0.5,1])  

plt.plot(x,y,label = "Sigmoid",linestyle='-',color='blue')
plt.legend()

def tanh(x):
    #result = np.exp(x)-np.exp(-x)/np.exp(x)+np.exp(-x)
    result = (math.e**(x) - math.e**(-x)) / (math.e**(x) + math.e**(-x))
    return result

ax = fig.add_subplot(122)
x = np.linspace(-10,10)
y = tanh(x)

ax.spines['top'].set_color('none')  
ax.spines['right'].set_color('none')  

ax.xaxis.set_ticks_position('bottom')  
ax.spines['bottom'].set_position(('data',0)) 

ax.set_xticks([-10,-5,0,5,10])  
ax.yaxis.set_ticks_position('left')  
ax.spines['left'].set_position(('data',0))  
ax.set_yticks([-1,-0.5,0.5,1])  

plt.plot(x,y,label = "Tanh",linestyle='-',color='blue')
plt.legend()
plt.savefig('sigmoid and tanh.png',dpi=200)

      2.2 relu和ELU

import math
import matplotlib.pyplot as plt
import numpy as np
import matplotlib as mpl
mpl.rcParams['axes.unicode_minus'] = False

def relu(x):
    result=np.maximum(0,x)
    return result

fig = plt.figure(figsize=(10,4))
ax = fig.add_subplot(121)
x = np.linspace(-10,10)
y = relu(x)

ax.spines['top'].set_color('none')  
ax.spines['right'].set_color('none')  

ax.xaxis.set_ticks_position('bottom')  
ax.spines['bottom'].set_position(('data',0))  
ax.set_xticks([-10,-5,0,5,10])  
ax.yaxis.set_ticks_position('left')  
ax.spines['left'].set_position(('data',0))  
ax.set_yticks([5,10])  

plt.plot(x,y,label = "Relu",linestyle='-',color='blue')
plt.legend()


def elu(x,alpha=1):
    a = x[x>0]
    b = alpha*(math.e**(x[x<0])-1)
    result=np.concatenate((b,a),axis=0)
    return result

ax = fig.add_subplot(122)
x = np.linspace(-10,10)
y = elu(x)

ax.spines['top'].set_color('none')  
ax.spines['right'].set_color('none')  

ax.xaxis.set_ticks_position('bottom')  
ax.spines['bottom'].set_position(('data',0))  
ax.set_xticks([-10,-5,0,5,10])  
ax.yaxis.set_ticks_position('left')  
ax.spines['left'].set_position(('data',0))  
ax.set_yticks([5,10])  

plt.plot(x,y,label = "ELU alpha=1",linestyle='-',color='blue')
plt.legend()
plt.savefig('Relu an ELU.png',dpi=200)

3、结果:

python 画sigmoid、tanh、relu和ELU等**函数

python 画sigmoid、tanh、relu和ELU等**函数

相关标签: Python