code: def get_default_tokenizer():
      default_vocab_path = pkg_resources.resource_filename(
          "deepchem", "feat/tests/vocab.txt"
      )
      return SmilesTokenizer(default_vocab_path)
  
imports: import collections
  import os
  import re
  import pkg_resources
  from typing import List, Optional
  from transformers import BertTokenizer
  from logging import getLogger
label_desc: Use image node_id 1 for calling a global function with example usage: get_default_tokenizer() and returns: SmilesTokenizer