code: def __init__(self):
      self.data = {
          "a": {
              "label": np.array([0, 1, 2, 3, 4, 5, 6, 7]),
              "aux": np.array([0, -1, -2, -3]),
          },
          "b": {
              "label": np.array([8, 9, 10, 11, 12]),
              "aux": np.array([-1, -2]),
          },
      }
  
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 1 to create a new Dataset2 object  with example: obj = Dataset2()