Questions about Fisher vector

[Elijah-Yi]

When I get the vector， I find some values is ‘Nan’ . What's going on?

[luntai]

What is 'pdf' in line 38 'gaussians[index] = np.array([g_k.pdf(x) for g_k in g])' ?????
I can't find the function @hendrycks @hugos94 @ @jacobsagivtech