code: def train_split(self) -> _typing.Optional[_typing.Iterable[_D]]:
      return (
          [self.__data[i] for i in self.__train_index]
          if isinstance(self.__train_index, _typing.Iterable)
          else None
      )
  
imports: import typing
label_desc: Use image node_id 9 for calling the InMemoryDataset obj's underlying member method code with example usage: obj.train_split() and returns: unknown