code: def fetch_text(doc_id):
      global PROCESS_DB
      return PROCESS_DB.get_doc_text(doc_id)
  
imports: import numpy
  import scipy.sparse
  import math
  from multiprocessing import Pool
  from multiprocessing.util import Finalize
  from functools import partial
  from collections import Counter
  from .None import utils
  from .doc_db import DocDB
  from .None import tokenizers
  import parlai.utils.logging
label_desc: Use image node_id 2 for calling a global function with example usage: fetch_text(doc_id) and returns: PROCESS_DB