[TOC]
sigmoid激活函數(shù)
#將圖片內(nèi)嵌在交互窗口堪嫂，而不是彈出一個(gè)圖片窗口 打印
%matplotlib inline
import matplotlib.pyplot as plt
import numpy as np
# 激活函數(shù)
def sigmoid(x,deriv = False):
if deriv is True:
return x * (1-x)
return 1/(1+np.exp(-x))
x = np.arange(-10,10,step=0.5)
y = [sigmoid(i) for i in x]
plt.plot(x, y)
#下面行不寫(xiě)會(huì)出現(xiàn) [<matplotlib.lines.Line2D at 0x111814390>] 字樣
plt.show()
sigmoid
ReLU函數(shù)
#將圖片內(nèi)嵌在交互窗口缸棵，而不是彈出一個(gè)圖片窗口 打印
%matplotlib inline
import matplotlib.pyplot as plt
import numpy as np
# 激活函數(shù)
def relu(x):
return max(0,x)
x = np.arange(-10,10,step=0.5)
y = [relu(i) for i in x]
plt.plot(x, y)
#下面行不寫(xiě)會(huì)出現(xiàn) [<matplotlib.lines.Line2D at 0x111814390>] 字樣
plt.show()
relu.png
