torch.exp
torch.exp(input, *, out=None) -> Tensor
Returns a new tensor with the exponential of the elements of the
   input tensor "input".
  y_{i} = e^{x_{i}}

Parameters:
      input (Tensor) -- the input tensor.
Keyword Arguments:
      out (Tensor, optional) -- the output tensor.
Example:
  >>> torch.exp(torch.tensor([0, math.log(2.)]))
  tensor([ 1.,  2.])
