Fix the unknow func in ast renamer.

Author: TelGome

graph_net/sample_pass/ast_graph_variable_renamer.py

@@ -232,9 +232,9 @@ def _clean_delete(self, stmt):
 
     def _filter_delete_target(self, target):
         if isinstance(target, ast.Tuple):  # del (a, b)
-            kept_elts = [e for e in target.elts if not self._is_protected_var(e)]
+            kept_elts = [e for e in target.elts if not self._is_input_or_weight_var(e)]
             return ast.Tuple(elts=kept_elts, ctx=ast.Del()) if kept_elts else None
-        elif not self._is_protected_var(target):  # del a
+        elif not self._is_input_or_weight_var(target):  # del a
             return target
         else:
             pass