I dont understand how -e^-z/(1+e^-z)^2 is expanded. I mean calculation me -ve sign kahan miss ho gaya numerator ka
A doubt in claclulating the differenciation of y hat wrt z
Hey @Lakshita, sharing the derivation process here, you are doing some mistake with the signd in derivative process.
Hope this resolved your doubt.
Plz mark doubt as resolved in my doubts section. 
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