code: def demo():
      """
      Run a demo with defaults. See source comments for details,
      or docstrings of any of the more specific demo_* functions.
      """
      postag()
  
imports: import os
  import pickle
  import random
  import time
  from nltk.corpus import treebank
  from nltk.tag import BrillTaggerTrainer, RegexpTagger, UnigramTagger
  from nltk.tag.brill import Pos, Word
  from nltk.tbl import Template, error_list
label_desc: Use image node_id 1 for calling a global function with example usage: demo() without return types