34 lines
712 B
Matlab
34 lines
712 B
Matlab
function g = sigmoidGradient(z)
|
|
%SIGMOIDGRADIENT returns the gradient of the sigmoid function
|
|
%evaluated at z
|
|
% g = SIGMOIDGRADIENT(z) computes the gradient of the sigmoid function
|
|
% evaluated at z. This should work regardless if z is a matrix or a
|
|
% vector. In particular, if z is a vector or matrix, you should return
|
|
% the gradient for each element.
|
|
|
|
g = zeros(size(z));
|
|
|
|
% ====================== YOUR CODE HERE ======================
|
|
% Instructions: Compute the gradient of the sigmoid function evaluated at
|
|
% each value of z (z can be a matrix, vector or scalar).
|
|
|
|
|
|
|
|
g = sigmoid(z) .* (1 - sigmoid(z));
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
% =============================================================
|
|
|
|
|
|
|
|
|
|
end
|