code: def define_graph(self):
      _, __, ___, ids = self.input(name="Reader")
      return ids
  
imports: import nose_utils
  import math
  from nvidia.dali.pipeline import Pipeline
  import nvidia.dali.ops
  import numpy
  import os
  from test_utils import get_dali_extra_path
label_desc: Use image node_id 2 for calling the COCOReaderPipeline obj's underlying member method code with example usage: obj.define_graph() and returns: ids