code: def test_vi_tokenizer_serialize(vi_tokenizer):
      tokenizer_bytes = vi_tokenizer.to_bytes()
      nlp = Vietnamese()
      nlp.tokenizer.from_bytes(tokenizer_bytes)
      assert tokenizer_bytes == nlp.tokenizer.to_bytes()
      assert nlp.tokenizer.use_pyvi is True
  
      with make_tempdir() as d:
          file_path = d / "tokenizer"
          vi_tokenizer.to_disk(file_path)
          nlp = Vietnamese()
          nlp.tokenizer.from_disk(file_path)
          assert tokenizer_bytes == nlp.tokenizer.to_bytes()
          assert nlp.tokenizer.use_pyvi is True
  
      # mode is (de)serialized correctly
      nlp = Vietnamese.from_config(
          {"nlp": {"tokenizer": {"use_pyvi": False}}}
      )
      nlp_bytes = nlp.to_bytes()
      nlp_r = Vietnamese()
      nlp_r.from_bytes(nlp_bytes)
      assert nlp_bytes == nlp_r.to_bytes()
      assert nlp_r.tokenizer.use_pyvi is False
  
      with make_tempdir() as d:
          nlp.to_disk(d)
          nlp_r = Vietnamese()
          nlp_r.from_disk(d)
          assert nlp_bytes == nlp_r.to_bytes()
          assert nlp_r.tokenizer.use_pyvi is False
  
imports: import pickle
  from spacy.lang.vi import Vietnamese
  from ...util import make_tempdir
label_desc: Use image node_id 1 for calling a global function with example usage: test_vi_tokenizer_serialize(vi_tokenizer) without return types