code: def __init__(self, epoch_len: Optional[int]):
      self.epoch_len = epoch_len
  
imports: from typing import Any, Dict, Optional, cast
  import mmcv
  import mmcv.runner.hooks
  import determined.pytorch
label_desc: Use image node_id 1 to create a new DummyDataloader object  with example: obj = DummyDataloader(epoch_len)