寂寞是国，我是王

$$ \begin{array}{r|l} W^{[l]}, \quad dW^{[l]} \quad & \quad (n^{[l]}, \quad n^{[l-1]}) \[1em] \hline b^{[l]}, \quad db^{[l]} \quad & \quad (n^{[l]}, \quad 1) \[1em] \hline Z^{[l]}, \[1em] \end{array} $$

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