torch.view_as_real
torch.view_as_real(input) -> Tensor
Returns a view of "input" as a real tensor. For an input complex
   tensor of "size" m1, m2, \dots, mi, this function returns a new
   real tensor of size m1, m2, \dots, mi, 2, where the last dimension
   of size 2 represents the real and imaginary components of complex
   numbers.
Warning:
 "view_as_real()" is only supported for tensors with "complex
 dtypes".

Parameters:
      input (Tensor) -- the input tensor.
Example:
  >>> x=torch.randn(4, dtype=torch.cfloat)
  >>> x
  tensor([(0.4737-0.3839j), (-0.2098-0.6699j), (0.3470-0.9451j), (-0.5174-1.3136j)])
  >>> torch.view_as_real(x)
  tensor([[ 0.4737, -0.3839],
          [-0.2098, -0.6699],
          [ 0.3470, -0.9451],
          [-0.5174, -1.3136]])
