code: def test_language_identifier(algo):
      lang_id_model = LanguageIdentifier(algo=algo)
      lang_label, score = lang_id_model("你好，世界")
      assert lang_label == "zh"
      with multiprocessing.Pool(2) as pool:
          out = pool.map(lang_id_model, ["你好，世界", "Hello World"])
      assert out[0][0] == "zh"
      assert out[1][0] == "en"
  
imports: import pytest
  from gluonnlp.data.filtering import ProfanityFilter, MosesNormalizer, LanguageIdentifier
  import multiprocessing
label_desc: Use image node_id 3 for calling a global function with example usage: test_language_identifier(algo) without return types