code: def stop(self):
      pass
  
file_path: petastorm/petastorm/benchmark/dummy_reader.py
imports: from __future__ import print_function
  from __future__ import division
  import time
  import numpy
  from petastorm.pytorch import BatchedDataLoader, DataLoader
  from collections import namedtuple
  import torch
  from functools import partial
  import sys
label_desc: Use image node_id 3 for calling the DummyReader obj's underlying member method code with example usage: obj.stop() without return types