Remove not use attribute

theano/gof/fg.py

@@ -172,8 +172,6 @@ class FunctionGraph(utils.object2):
         for i, output in enumerate(outputs):
             output.clients.append(('output', i))
 
-        self.node_locks = {}
-        self.variable_locks = {}
         self.profile = None
         self.update_mapping = update_mapping