hash tuple instead of xor them

theano/misc/pycuda_example.py

@@ -287,7 +287,7 @@ class PycudaElemwiseSourceModuleMakeThunkOp(Op):
 
     # As we have a dict in props, we need to implement __hash__
     def __hash__(self):
-        return (hash(type(self)) ^ hash(self.scalar_op) ^
+        return hash(type(self), hash(self.scalar_op),
                 hash_from_dict(self.inplace_pattern))
 
     def __str__(self):