class_docstr: This is the training version of the dataset.
class_docstr_tok: ["This","is","the","training","version","of","the","dataset","."]
code: def __len__(self):
      return len(self.sentence_ids)
  
imports: from bisect import bisect_right
  from copy import copy
  import numpy
  import random
  import logging
  import re
  import torch
  from torch.utils.data import Dataset
  from .vocab import Vocab
  from stanza.models.common.utils import sort_with_indices, unsort
label_desc: Use image node_id 2 for calling the DataLoader obj's underlying member method code with example usage: obj.__len__() and returns: len