tensor types.
  * **requires_grad** (*bool**, **optional*) -- If autograd should
    record operations on the returned tensor. Default: "False".

Example:
  >>> torch.range(1, 4)
  tensor([ 1.,  2.,  3.,  4.])
  >>> torch.range(1, 4, 0.5)
  tensor([ 1.0000,  1.5000,  2.0000,  2.5000,  3.0000,  3.5000,  4.0000])
