code: def __len__(self) -> int:
      return self.total_sentence_count
  
imports: import logging
  import os
  from pathlib import Path
  from typing import List, Optional, Union
  import flair
  from flair.data import Corpus, DataPair, FlairDataset, Sentence, TextPair, _iter_dataset
  from flair.datasets.base import find_train_dev_test_files
  from flair.file_utils import cached_path, unpack_file, unzip_file
label_desc: Use image node_id 3 for calling the ParallelTextDataset obj's underlying member method code with example usage: obj.__len__() and returns: self