torch.frac
torch.frac(input, *, out=None) -> Tensor
Computes the fractional portion of each element in "input".
  \text{out}_{i} = \text{input}_{i} - \left\lfloor
  |\text{input}_{i}| \right\rfloor *
  \operatorname{sgn}(\text{input}_{i})

Example:
  >>> torch.frac(torch.tensor([1, 2.5, -3.2]))
  tensor([ 0.0000,  0.5000, -0.2000])
