code: def __getitem__(self, item):
      return item, self.data[item]
  
file_path: espnet/test/espnet2/iterators/test_chunk_iter_factory.py
imports: import re
  import numpy
  import pytest
  from espnet2.iterators.chunk_iter_factory import ChunkIterFactory
  from espnet2.train.collate_fn import CommonCollateFn
label_desc: Use image node_id 2 for calling the Dataset2 obj's underlying member method code with example usage: obj.__getitem__(item) and returns: item,  self