torch.neg
torch.neg(input, *, out=None) -> Tensor
Returns a new tensor with the negative of the elements of "input".
  \text{out} = -1 \times \text{input}

Parameters:
      input (Tensor) -- the input tensor.
Keyword Arguments:
      out (Tensor, optional) -- the output tensor.
Example:
  >>> a = torch.randn(5)
  >>> a
  tensor([ 0.0090, -0.2262, -0.0682, -0.2866,  0.3940])
  >>> torch.neg(a)
  tensor([-0.0090,  0.2262,  0.0682,  0.2866, -0.3940])
