code: def mock_vocab():
      return (
          "3K}7eé;5àÎYho]QwV6qU~W\"XnbBvcADfËmy.9ÔpÛ*{CôïE%M4#ÈR:g@T$x?0î£|za1ù8,OG€P-kçHëÀÂ2É/ûIJ'j"
          "(LNÙFut[)èZs+&°Sd=Ï!<â_Ç>rêi`l"
      )
  
imports: import json
  import shutil
  import tempfile
  from io import BytesIO
  import cv2
  import hdf5storage
  import numpy
  import pytest
  import requests
  import scipy.io
  from PIL import Image
  from doctr.datasets.generator.base import synthesize_text_img
  from doctr.io import reader
  from doctr.utils import geometry
label_desc: Use image node_id 1 for calling a global function with example usage: mock_vocab() and returns: str