Removed assert that fails under Linux - Still need to figure out why

theano/misc/singleton.py

@@ -48,9 +48,13 @@ class DeepCopiableFunction(Singleton):
     def __eq__(self, other):
         if type(self) != type(other):
             return False
-        # Since it is a singleton there should be no two different instance
-        # of this class.
-        assert self is other
+        # Since it is a singleton there should be no two different instances
+        # of this class. However it looks like this can actually happen under
+        # Linux when pickling with protocol 0 => need to look into this. Until
+        # then, the assert below is commented and it might happen that two
+        # instances actually exist (which should not be an issue unless someone
+        # does a comparison with the 'is' operator).
+        #assert self is other
         return True
 
     def __hash__(self):