torch.signbit
torch.signbit(input, *, out=None) -> Tensor
Tests if each element of "input" has its sign bit set or not.
Parameters:
      input (Tensor) -- the input tensor.
Keyword Arguments:
      out (Tensor, optional) -- the output tensor.
Example:
  >>> a = torch.tensor([0.7, -1.2, 0., 2.3])
  >>> torch.signbit(a)
  tensor([ False, True,  False,  False])
  >>> a = torch.tensor([-0.0, 0.0])
  >>> torch.signbit(a)
  tensor([ True,  False])

Note:
 signbit handles signed zeros, so negative zero (-0) returns True.
