ValueError: zero-size array to reduction operation maximum which has no identity

[dangz90]

Hi,

While trying to obtain the fisher vectors, I receive the following error:

Traceback (most recent call last):
  File "C:\Users\dangz\Documents\Fotolog\Aesthetic\descriptor\descriptors_aesthetics.py", line 49, in <module>
    fisher_vectors = fisherClass.get_fisher_vectors_from_folder(filename, 3)
  File "C:\Users\dangz\Documents\Fotolog\Aesthetic\descriptor\aesthetics\fisher\fisher.py", line 58, in get_fisher_vectors_from_folder
    max_shape = np.array([v.shape[0] for v in vectors]).max()
  File "C:\Users\dangz\Anaconda3\lib\site-packages\numpy\core\_methods.py", line 26, in _amax
    return umr_maximum(a, axis, None, out, keepdims)
ValueError: zero-size array to reduction operation maximum which has no identity

I have been able to trace back it back to this line in fisher.py:
normals = [multivariate_normal(mean=means[k], cov=covariances[k]) for k in range(len(weights))]
It seems this returns nothing and doesn't execute the next lines of code.