How to understand the step(Z1) in the equation of partial derivation given W1 and b1, and how to correctly implement it in python?
Hi!
step(Z_1) is a step function evaluating on Z_1. That means if Z_1 < 0, then
step(Z_1)=0, else 1.
In assignment we make W_2^T(\hat{Y}-Y) = 0 if Z_1 < 0. In Python, this has already been done for you in the line l1[z1 < 0] = 0. So you don’t have to worry about implementing step function.
Hope that helps.
Thanks for clear answer. You really saved my day. It should be added in video or its slide or in assignment to clarify other students/professionals who might also get confused and stuck.