Hi, In the back propagation video how does Andrew get the dZ_[1] result as W_[2].T dZ_[2] * g_[1]'(Z_[1])? He skips the derivative of da_[1] so I have no idea how to get dZ_[1].

How to derive dZ_[1]

paulinpaloalto May 29, 2023, 4:35am 4

And here’s another thread on this same subject.

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