code: def demo_serialize_tagger():
      """
      Serializes the learned tagger to a file in pickle format; reloads it
      and validates the process.
      """
      postag(serialize_output="tagger.pcl")
  
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 11 for calling a global function with example usage: demo_serialize_tagger() without return types