code: def test_model_from_pretrained(self):
      for model_name in GPT2_PRETRAINED_MODEL_ARCHIVE_LIST[:1]:
          model = GPT2Model.from_pretrained(model_name)
          self.assertIsNotNone(model)
  
imports: import datetime
  import gc
  import math
  import unittest
  from transformers import GPT2Config, is_torch_available
  from transformers.testing_utils import backend_empty_cache, require_torch, slow, torch_device
  from ...generation.test_utils import GenerationTesterMixin
  from ...test_configuration_common import ConfigTester
  from ...test_modeling_common import ModelTesterMixin, floats_tensor, ids_tensor, random_attention_mask
  from ...test_pipeline_mixin import PipelineTesterMixin
label_desc: Use image node_id 23 for calling the GPT2ModelTest obj's underlying member method code with example usage: obj.test_model_from_pretrained() without return types