code: def test_vi_tokenizer_pickle(vi_tokenizer):
      b = pickle.dumps(vi_tokenizer)
      vi_tokenizer_re = pickle.loads(b)
      assert vi_tokenizer.to_bytes() == vi_tokenizer_re.to_bytes()
  
imports: import pickle
  from spacy.lang.vi import Vietnamese
  from ...util import make_tempdir
label_desc: Use image node_id 2 for calling a global function with example usage: test_vi_tokenizer_pickle(vi_tokenizer) without return types