code: def define_graph(self):
      cf = self.cf()
      return cf
  
file_path: DALI/dali/test/python/test_deserialization.py
imports: import nvidia.dali.ops
  from nvidia.dali.pipeline import Pipeline
  import test_utils
  from nose_utils import raises
label_desc: Use image node_id 2 for calling the TestPipeline obj's underlying member method code with example usage: obj.define_graph() and returns: cf