>>> import torch
>>> import numpy as np
>>> torch.cat((np.ones((5,5)), np.zeros((5,5))),1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: expected Variable as element 0 in argument 0, but got tuple


Well this error message didnt make sense to me, especially when Variables are deprecated in pytorch 0.4
I guess it could be improved…