code: def test_model_from_pretrained(self):
      for model_name in CTRL_PRETRAINED_MODEL_ARCHIVE_LIST[:1]:
          model = CTRLModel.from_pretrained(model_name)
          self.assertIsNotNone(model)
  
imports: import gc
  import unittest
  from transformers import CTRLConfig, is_torch_available
  from transformers.testing_utils import require_torch, slow, torch_device
  from ...generation.test_generation_utils import GenerationTesterMixin
  from ...test_configuration_common import ConfigTester
  from ...test_modeling_common import ModelTesterMixin, ids_tensor, random_attention_mask
label_desc: Use image node_id 6 for calling the CTRLModelTest obj's underlying member method code with example usage: obj.test_model_from_pretrained() without return types