code: def overridden_method(self, x):
      return x + 20
  
imports: import unittest
  from nvidia.dali._autograph.core import converter
  from nvidia.dali._autograph.core import function_wrappers
  from nvidia.dali._autograph.operators import py_builtins
label_desc: Use image node_id 1 for calling the TestBase obj's underlying member method code with example usage: obj.overridden_method(x) and returns: unknown