code: def _simple_context(self):
      entity_info = transformer.EntityInfo(
          name="test_fn",
          source_code=None,
          source_file=None,
          future_features=(),
          namespace=None,
      )
      return transformer.Context(entity_info, None, None)
  
imports: import textwrap
  import unittest
  import gast
  from nvidia.dali._autograph.pyct import loader
  from nvidia.dali._autograph.pyct import parser
  from nvidia.dali._autograph.pyct import transformer
  from nvidia.dali._autograph.pyct.common_transformers import anf
label_desc: Use image node_id 1 for calling the AnfTestBase obj's underlying member method code with example usage: obj._simple_context() and returns: transformer