torch.sub
torch.sub(input, other, *, alpha=1, out=None) -> Tensor
Subtracts "other", scaled by "alpha", from "input".
  \text{{out}}_i = \text{{input}}_i - \text{{alpha}} \times
  \text{{other}}_i

Supports broadcasting to a common shape, type promotion, and
   integer, float, and complex inputs.
Parameters:
      * input (Tensor) -- the input tensor.
  * **other** (*Tensor** or **Number*) -- the tensor or number to
    subtract from "input".

Keyword Arguments:
      * alpha (Number) -- the multiplier for "other".
  * **out** (*Tensor**, **optional*) -- the output tensor.

Example:
  >>> a = torch.tensor((1, 2))
  >>> b = torch.tensor((0, 1))
  >>> torch.sub(a, b, alpha=2)
  tensor([1, 0])
