code: def pre_load_chunk(
      self, chunk_index: int, chunk_filepath: str
  ) -> None:
      # This is called within the prepare chunks thread, so we overlap data loading with data reading.
      if chunk_filepath not in self._chunk_filepaths:
          self._chunk_filepaths[chunk_filepath] = True
  
      self._load_chunk(chunk_index, chunk_filepath)
  
imports: import os
  from abc import ABC, abstractmethod
  from time import sleep
  from typing import Any, Dict, List, Optional, Tuple
  import numpy
  import torch
  from lightning.data.streaming.constants import _TORCH_DTYPES_MAPPING, _TORCH_GREATER_EQUAL_2_1_0
  from lightning.data.streaming.serializers import Serializer
label_desc: Use image node_id 6 for calling the TokensLoader obj's underlying member method code with example usage: obj.pre_load_chunk(chunk_index, chunk_filepath) without return types