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tpbui

Why is the partial derivative of a3 w.r.t. to w3 = f2? If I miss anything, please let me know the slides I can refer back to. Thank you!

motoole2

In this case, we want to compute the partial derivative of the loss with respect to $w_3$ (which is not the same as $f_2$, to be clear). Therefore, the last partial derivative in the chain will be computed with respect to $w_3$.