[Screenshot_20240929_011549_Coursera] In the above picture the derivation of dL/dz (dz) is a-y My solution for dL/dz is below [20240929_012204] Where did I go wrong? And why is da/dz is written as a(1-a) instead of e^-z/(1+e^-z)^2 ?

Didn't understand derivation of dL/dz and da/dz

paulinpaloalto September 28, 2024, 9:47pm 2

Here’s a thread which covers all that in detail.

They refer you to google to get the actual derivative of sigmoid. Here’s a MathExchange thread that covers that.

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