code: def test_base_model_concrete_instantiation():
      class MyBaseModel(BaseModel):
          def build(self):
              self._backend = "something"
  
      model = MyBaseModel()
      assert model.params
      model.guess_and_fill_missing_params()
      model.build()
      assert model.backend
      assert model.params.completed()
  
label_desc: Use image node_id 2 for calling a global function with example usage: test_base_model_concrete_instantiation() without return types