torch.floor
torch.floor(input, *, out=None) -> Tensor
Returns a new tensor with the floor of the elements of "input", the
   largest integer less than or equal to each element.
For integer inputs, follows the array-api convention of returning a
   copy of the input tensor.
  \text{out}_{i} = \left\lfloor \text{input}_{i} \right\rfloor

Parameters:
      input (Tensor) -- the input tensor.
Keyword Arguments:
      out (Tensor, optional) -- the output tensor.
Example:
  >>> a = torch.randn(4)
  >>> a
  tensor([-0.8166,  1.5308, -0.2530, -0.2091])
  >>> torch.floor(a)
  tensor([-1.,  1., -1., -1.])
