code: def test_mlmodel_input(self):
      ml_model = MLModel(self.spec)
      with pytest.raises(
          TypeError, match=" model has already been compiled."
      ):
          compiled_model_path = compile_model(ml_model)
  
file_path: coremltools/coremltools/test/neural_network/test_compiled_model.py
imports: from shutil import copytree, rmtree
  from tempfile import TemporaryDirectory
  import pytest
  from coremltools import ComputeUnit
  from coremltools.models import CompiledMLModel, MLModel
  from coremltools.models.utils import compile_model, load_spec, save_spec
  from coremltools.proto import Model_pb2
label_desc: Use image node_id 5 for calling the TestCompiledModel obj's underlying member method code with example usage: obj.test_mlmodel_input() without return types