code: def __init__(self, data_creator):
      self.data_creator = data_creator
      self.getitem_fixed = (
          self.sep_getitem_fixed
          if self.data_creator.use_separators
          else self.data_creator.nosep_getitem_fixed
      )
  
imports: from tqdm import tqdm
  from typing import Tuple
  from random import shuffle
  import pickle
  import random
  import numpy
  from pathlib import Path
  from pytorch_pretrained_bert.tokenization import BertTokenizer
label_desc: Use image node_id 1 to create a new NumpyByteInstances object  with example: obj = NumpyByteInstances(data_creator)