code: def delete(self, chunk_index: int, chunk_filepath: str) -> None:
      if os.path.exists(chunk_filepath):
          if chunk_index in self._buffers:
              del self._buffers[chunk_index]
          if chunk_index in self._mmaps:
              del self._mmaps[chunk_index]
          os.remove(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 8 for calling the TokensLoader obj's underlying member method code with example usage: obj.delete(chunk_index, chunk_filepath) without return types