损失函数为:L(w)=−1m∑i=1m(yiln[h(xi)]+(1−yi)ln[1−h(xi)]) L ( w ) = − 1 m ∑ i = 1 m ( y i l n [ h ( x i ) ] + ( 1 − y i ) l n [ 1 − h ( x i ) ] ) 求偏导得:∂L(w)∂w=−1m∑i=1m[yi−h(xi)]xi ∂ L ( w ) ...