Small_Lemon_Tree的博客

前向传播 z1=xw1+b1z_1=xw_1+b_1z1​=xw1​+b1​ (M,N1)=(M,N)(N,N1)+(1,N1) a1=sigmoid(z1)a_1=sigmoid(z_1)a1​=sigmoid(z1​) (M,N1)=(M,N1) z2=a1w2+b2z_2=a_1w_2+b_2z2​=a1​w2​+b2​ (M,N2)=(M,N1)(N1,N2)+(1,N2) a2=sigmoid(z2)a_2=sigmoid(z_2)a2​=sigmoid(z2​) (M,N2)=(M,N2) z3