+ -> ^ in __hash__()

theano/sparse/basic.py

@@ -759,7 +759,7 @@ class DenseFromSparse(gof.op.Op):
             (self.sparse_grad == other.sparse_grad)
 
     def __hash__(self):
-        return hash(type(self))+hash(self.sparse_grad)
+        return hash(type(self))^hash(self.sparse_grad)
 
     def make_node(self, x):
         x = as_sparse_variable(x)

theano/sparse/tests/test_basic.py

@@ -72,7 +72,7 @@ class T_verify_grad_sparse(unittest.TestCase):
                 self.structured == other.structured
 
         def __hash__(self):
-            return hash(type(self)) + hash(self.structured)
+            return hash(type(self)) ^ hash(self.structured)
 
         def make_node(self, x):
             x = as_sparse_variable(x)