0.
Parameters:
      * n (int) -- the order of the polygamma function
  * **input** (*Tensor*) -- the input tensor.

Keyword Arguments:
      out (Tensor, optional) -- the output tensor.
Example::
      >>> a = torch.tensor([1, 0.5])
      >>> torch.special.polygamma(1, a)
      tensor([1.64493, 4.9348])
      >>> torch.special.polygamma(2, a)
      tensor([ -2.4041, -16.8288])
      >>> torch.special.polygamma(3, a)
      tensor([ 6.4939, 97.4091])
      >>> torch.special.polygamma(4, a)
      tensor([ -24.8863, -771.4742])
torch.special.psi(input, *, out=None) -> Tensor
Alias for "torch.special.digamma()".
torch.special.round(input, *, out=None) -> Tensor
Alias for "torch.round()".
torch.special.scaled_modified_bessel_k0(input, *, out=None) -> Tensor
Scaled modified Bessel function of the second kind of order 0.
Parameters:
      input (Tensor) -- the input tensor.
Keyword Arguments: