Machine Learning, Deep Learning, Backpropagation, Artificial Intelligence, Differential Calculus.
same only third term is different.So,we are not going to calculate these two terms again.Let’s calculation the third term of the above equation: Recall that Z[l]=W[l].A[l-1] + b .Therefore differentiating Z[l] w.r.t A[l-1] gives us W[l] only: Figure 18.Derivative of Z[l] w.r.t A[l].