code: def __iter__(self):
      return range(self.size)
  
imports: import random
  import warnings
  import weakref
  from collections import OrderedDict
  import numpy
  import torch
  from pyro.distributions import validation_enabled
label_desc: Use image node_id 3 for calling the PlateMessenger obj's underlying member method code with example usage: obj.__iter__() and returns: range