torch.can_cast
torch.can_cast(from, to) -> bool
Determines if a type conversion is allowed under PyTorch casting
   rules described in the type promotion documentation.
Parameters:
      * from (dtype) -- The original "torch.dtype".
  * **to** (*dtype*) -- The target "torch.dtype".

Example:
  >>> torch.can_cast(torch.double, torch.float)
  True
  >>> torch.can_cast(torch.float, torch.int)
  False
