code: def __init__(self, data_fetcher: _DataLoaderIterDataFetcher) -> None:
      self.data_fetcher = data_fetcher
  
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 1 to create a new _DataFetcherWrapper object from inherited base classes: Iterator with example: obj = _DataFetcherWrapper(data_fetcher)