$$ \frac{\partial L}{\partial b^{(2)}} = \frac{\partial L}{\partial z^{(2)}} \frac{\partial z^{(2)}}{\partial b^{(2)}} = \frac{\partial L}{\partial z^{(2)}} $$计算\(\frac{\partial L}{\partial z^{(2)}}\):
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Cx) STATE=C89; ast_Cw; continue;;