Generate int or tensor `size` of ints between `low` and `high` (included).

def uniform_int(low:int, high:int, size:Optional[List[int]]=None)->IntOrTensor:
    "Generate int or tensor `size` of ints between `low` and `high` (included)."
    return random.randint(low,high) if size is None else torch.randint(low,high+1,size)