Changed function signature and called super.

theano/configdefaults.py

@@ -25,8 +25,9 @@ AddConfigVar('floatX',
 )
 
 AddConfigVar('warn_float64',
-             "Warning, parts of the graph are in float64 which can't be run on the GPU",
-            BoolParam(False)
+             "Warning, parts of the graph are in float64 which can't be run on the GPU with the current(old) gpu back-end.",
+             BoolParam(False),
+             in_c_key=False,
 )
 
 AddConfigVar('cast_policy',

theano/tensor/var.py

@@ -575,7 +575,8 @@ class _tensor_py_operators:
 class TensorVariable(_tensor_py_operators, Variable):
     """Subclass to add the tensor operators to the basic `Variable` class."""
 
-    def __init__(self, type, name=None):
+    def __init__(self, type, owner=None, index=None, name=None):
+        super(TensorVariable, self).__init__(type, owner=owner, index=index, name=name)
         if (config.warn_float64 and type == 'float64'):
             print '''Warning, you are instanciating parts of your graph 
                 with the float64 type (possibly by accident).