code: def __getitem__(self, index: int = 0) -> Sentence:
      if self.in_memory:
          sentence = self.sentences[index]
  
      # else skip to position in file where sentence begins
      else:
          sentence = self._load_example(self.file_names[index])
  
          # set sentence context using partials TODO: pointer to dataset is really inefficient
          sentence._has_context = True
          sentence._position_in_dataset = (self, index)
  
      return sentence
  
imports: import json
  from pathlib import Path
  from typing import Dict, Optional, Union
  import gdown.download_folder
  import PIL
  from torch.utils.data import Dataset
  import flair
  from flair.data import BoundingBox, Corpus, FlairDataset, Sentence, get_spans_from_bio
  from flair.datasets.base import find_train_dev_test_files
label_desc: Use image node_id 6 for calling the OcrJsonDataset obj's underlying member method code with example usage: obj.__getitem__(index) and returns: sentence