code: def get_tokenizer_trainer():
      # START init_tokenizer_trainer
      from tokenizers import (
          Tokenizer,
          decoders,
          models,
          normalizers,
          pre_tokenizers,
          trainers,
      )
  
      tokenizer = Tokenizer(models.Unigram())
      tokenizer.normalizer = normalizers.NFKC()
      tokenizer.pre_tokenizer = pre_tokenizers.ByteLevel()
      tokenizer.decoder = decoders.ByteLevel()
  
      trainer = trainers.UnigramTrainer(
          vocab_size=20000,
          initial_alphabet=pre_tokenizers.ByteLevel.alphabet(),
          special_tokens=["<PAD>", "<BOS>", "<EOS>"],
      )
      # END init_tokenizer_trainer
      trainer.show_progress = False
  
      return tokenizer, trainer
  
file_path: hf-tokenizers/bindings/python/tests/documentation/test_tutorial_train_from_iterators.py
imports: import gzip
  import os
  import datasets
  import pytest
  from ..utils import data_dir, train_files
label_desc: Use image node_id 1 for calling the TestTrainFromIterators obj's underlying member method code with example usage: obj.get_tokenizer_trainer() and returns: tokenizer,  trainer