?
import?numpy?as?np
import?matplotlib.pyplot?as?plt
from?mpl_toolkits.mplot3d?import?Axes3D
import?math
import?random
def?sigma(x):
????return?1?/?(1?+?math.exp(-x))
e0?=?1
e1?=?1
e2?=?1
alpha?=?0.1
omga0?=?np.random.uniform(-1,0)
omga1?=?np.random.uniform(0,1)
omga2?=?np.random.uniform(0,1)
omga?=?np.array([omga1,omga1])
eps?=?0.0000000001
x?=?np.array([[0,0],[1,1],[1,0],[0,1]])
t?=?np.array([0,1,0,0])
i?=?0
cnt?=?0
while(abs(e0)?>=?eps?or?abs(e1)?>=?eps?or?abs(e2)?>=?eps):
????cnt?+=?1
????z1?=?np.sum((x[i]?*?oga))
????e0?=?(1-sigma(z1?+?oga0))?*?sigma(z1?+?oga0)?*?((sigma(z1?+?oga0)?-?t[i]))
????e1?=?(1-sigma(z1?+?oga0))?*?sigma(z1?+?oga0)?*?((sigma(z1?+?oga0)?-?t[i]))?*?x[i][0]
????e2?=?(1-sigma(z1?+?oga0))?*?sigma(z1?+?oga0)?*?((sigma(z1?+?oga0)?-?t[i]))?*?x[i][1]
????i?+=?1
????if(i?>?3):
????????i?=?0
? ? oga0?=?oga0?-?(alpha?*?e0)
????oga1?=?oga1?-?(alpha?*?e1)
????oga2?=?oga2?-?(alpha?*?e2)
????oga?=?np.array([oga1,?oga2])
????print(e0,e1,e2)
print(cnt)
print(oga0,oga1,oga2)
print(sigma(oga0?+?oga1?*?0?+?oga2?*?0))
print(sigma(oga0?+?oga1?*?1?+?oga2?*?0))
print(sigma(oga0?+?oga1?*?0?+?oga2?*?1))
print(sigma(oga0?+?oga1?*?1?+?oga2?*?1))
?