torch.positive
torch.positive(input) -> Tensor
Returns "input". Throws a runtime error if "input" is a bool
   tensor.
Parameters:
      input (Tensor) -- the input tensor.
Example:
  >>> t = torch.randn(5)
  >>> t
  tensor([ 0.0090, -0.2262, -0.0682, -0.2866,  0.3940])
  >>> torch.positive(t)
  tensor([ 0.0090, -0.2262, -0.0682, -0.2866,  0.3940])
