code: def __iter__(self):
      for index in range(len(self)):
          yield self[index]
  
imports: import os
  import json
  import h5py
  import numpy
  import torch
  import copy
  from ordered_set import OrderedSet
  from torchmeta.utils.data import Task, MetaDataset
  from torchmeta.datasets.utils import get_asset
label_desc: Use image node_id 5 for calling the TCGATask obj's underlying member method code with example usage: obj.__iter__() without return types