code: def define_graph(self):
      images, bb, labels = self.input(name="Reader")
      return self.base_define_graph(images, labels)
  
imports: import argparse
  import glob
  import nvidia.dali.ops
  import nvidia.dali.tfrecord
  import nvidia.dali.types
  import os
  from nvidia.dali.pipeline import Pipeline
  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: self