code: def test_cpmant_lm_head_model(self):
      config, inputs = self.model_tester.prepare_config_and_inputs()
      self.model_tester.create_and_check_lm_head_model(config, inputs)
  
imports: import unittest
  from transformers.testing_utils import is_torch_available, require_torch, tooslow
  from ...generation.test_utils import torch_device
  from ...test_configuration_common import ConfigTester
  from ...test_modeling_common import ModelTesterMixin, ids_tensor
  from ...test_pipeline_mixin import PipelineTesterMixin
label_desc: Use image node_id 6 for calling the CpmAntModelTest obj's underlying member method code with example usage: obj.test_cpmant_lm_head_model() without return types