计算sigmoid函数A
import numpy as np
w=np.random.randint(6,size=(1,4))
x1=np.random.randint(6,size=(1,4)) x2=np.random.randint(6,size=(1,4)) x3=np.random.randint(6,size=(1,4)) x4=np.random.randint(6,size=(1,4)) X=np.array(【x1,x2,x3,x4】).reshape(4,4).T b=np.random.randint(8,size=(1,1))
z=np.dot(w,X)+b A=1/(1+np.exp(-z))
附图：
