docstr: Do nothing. Since each item is one document
docstr_tok: ["Do","nothing",".","Since","each","item","is","one","document"]
code: def end_document(self):
      """
      Do nothing. Since each item is one document
      """
      pass
  
imports: import os
  import shutil
  import struct
  from functools import lru_cache
  from itertools import accumulate
  from typing import List
  import numpy
  import torch
  from nemo.utils import logging
label_desc: Use image node_id 3 for calling the MMapRetrievalIndexedDatasetBuilder obj's underlying member method code with example usage: obj.end_document() without return types