연습문제 1. 2입력 2은닉 2출력 인공신경망 x1,x2=0.05,0.10 w1,w2=0.15,0.20 w3,w4=0.25,0.30 b1,b2=0.35,0.35 w5,w6=0.40,0.45 w7,w8=0.50,0.55 b3,b4=0.60,0.60 y1T,y2T=0.01,0.99 lr=0.01 for epoch in range(2000): h1=x1*w1+x2*w2+1*b1 h2=x1*w3+x2*w4+1*b2 y1=h1*w5+h2*w6+1*b3 y2=h1*w7+h2*w8+1*b4 E=((y1-y1T)**2+(y2-y2T)**2)/2 y1E=y1-y1T y2E=y2-y2T w5E=y1E*h1 w6E=y1E*h2 w7E=y2E*h1 w8E=y2E*h2 b3E=y1E*1 b4E=y2E*1 h1E=y1E*w5+y..