code: def __getitem__(self, index):
      return self.samples[index]
  
file_path: apex/tests/L0/run_transformer/test_batch_sampler.py
imports: import torch
  from torch.testing._internal import common_utils
  from torch.utils.data import Dataset
  from torch.utils.data import DataLoader
  from apex.transformer.pipeline_parallel.utils import _split_batch_into_microbatch
label_desc: Use image node_id 3 for calling the MyIterableDataset obj's underlying member method code with example usage: obj.__getitem__(index) and returns: self