where's the grad function?

[appleyuchi]

where's the grad function?
I can not run it

[Tack-Tau]

where's the grad function?
I can not run it

My guess is that you need the analytical form of the gradient of the target function f, or maybe you can compute the gradient using finite difference packages like numpy.gradient. And it appears this Self-contained implementation of non-linear optimization algorithms is in 2D case, need to be revised if you want to use it for higher dimension cases.