午夜稻草人

摘要： J=0;dw1=0;dw2=0;db=0; for i = 1 to m z(i) = wx(i)+b; a(i) = sigmoid(z(i)); J += -[y(i)log(a(i))+(1-y(i)）log(1-a(i)); dz(i) = a(i)-y(i); dw1 += x1(i)dz 阅读全文