code: def get_fixlen_iter(self, start=0):
      for i in range(start, self.data.size(0) - 1, self.bptt):
          yield self.get_batch(i)
  
imports: import glob
  import os
  import pickle
  import re
  from collections import Counter, OrderedDict
  from typing import List, Optional, Tuple
  import numpy
  from ...tokenization_utils import PreTrainedTokenizer
  from ...utils import cached_file, is_sacremoses_available, is_torch_available, logging, requires_backends, torch_only_method
label_desc: Use image node_id 3 for calling the LMOrderedIterator obj's underlying member method code with example usage: obj.get_fixlen_iter(start) without return types