Reuse old Rebroadcast.__hash__ as it was working well

theano/compile/ops.py

@@ -617,6 +617,12 @@ class Rebroadcast(gof.Op):
                 "Rebroadcast needs bool for new broadcast pattern. Got ",
                 broad)
 
+    def __hash__(self):
+        # Need special __hash__ as dict aren't hashable.
+        # no ambiguity because each item key is unique
+        items = sorted(iteritems(self.axis))
+        return hash((type(self), tuple(items)))
+
     def __str__(self):
         if len(self.axis) == 0:
             broadcast_pattern = []

theano/gof/op.py

@@ -678,16 +678,7 @@ class Op(utils.object2, PureOp, CLinkerOp):
 
     def __hash__(self):
         if hasattr(self, '__props__'):
-            dicts = []
-            props = []
-            for elem in self._props():
-                if isinstance(elem, dict):
-                    dicts.append(elem)
-                else:
-                    props.append(elem)
-            h = hash((type(self), tuple(props),
-                      tuple(utils.hash_from_dict(elem) for elem in dicts)))
-            return h
+            return hash((type(self), self._props()))
         else:
             return super(Op, self).__hash__()