code: def teardown(self) -> None:
      self.reset()
      if self._combined_loader is not None:
          self._combined_loader.reset()
      self.iterator = None
  
imports: from typing import Any, Iterator, List, Optional
  from typing_extensions import override
  from lightning.fabric.utilities.data import sized_len
  from lightning.pytorch.utilities.combined_loader import _ITERATOR_RETURN, CombinedLoader
  from lightning.pytorch.utilities.exceptions import MisconfigurationException
label_desc: Use image node_id 7 for calling the _DataFetcher obj's underlying member method code with example usage: obj.teardown() without return types