>>> class A:
...     def __init__(self, x):
...         self.x = x
...     def __radd__(self, other):
...         print('A.radd')
...     def __rpow__(self, other):
...         print('A.rpow')
...
>>> torch.tensor([1]) + A(1)
A.radd
>>> torch.tensor([1]) ** A(1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: pow() received an invalid combination of arguments - got (A), but expected one of:
 * (Tensor exponent)
      didn't match because some of the arguments have invalid types: (A)
 * (Number exponent)
      didn't match because some of the arguments have invalid types: (A)

>>> torch.tensor([1]) + A(1)
A.radd
>>> torch.tensor([1]) ** A(1)
A.rpow

>>> torch.tensor([1]) & 1
tensor([1])
>>> 1 & torch.tensor([1])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for &: 'int' and 'Tensor'

>>> torch.tensor([1]) & 1
tensor([1])
>>> 1 & torch.tensor([1])
tensor([1])