code: def model_class(request):
      return request.param
  
file_path: MatchZoo/tests/unit_test/models/test_models.py
imports: import pytest
  import copy
  from pathlib import Path
  import shutil
  import matchzoo
  from keras.backend import clear_session
label_desc: Use image node_id 3 for calling a global function with example usage: model_class(request) and returns: request