code: def __init__(self, start, end):
      super().__init__()
      self._start = start
      self._end = end
  
file_path: pytorch-lightning/tests/tests_data/streaming/test_combined.py
imports: import pytest
  from lightning.data.streaming.combined import CombinedStreamingDataset
  from torch.utils.data import IterableDataset
label_desc: Use image node_id 1 to create a new SimpleDataset object from inherited base classes: IterableDataset with example: obj = SimpleDataset(start, end)