code: def polish_model(model):  # type: (ModelProto) -> ModelProto
      '''
          This function combines several useful utility functions together.
      '''
      onnx.checker.check_model(model)
      onnx.helper.strip_doc_string(model)
      model = onnx.shape_inference.infer_shapes(model)
      model = onnx.optimizer.optimize(model)
      onnx.checker.check_model(model)
      return modef polish_model(model):  # type: (ModelProto) -> ModelProto
      '''
          This function combines several useful utility functions together.
      '''
      onnx.checker.check_model(model)
      onnx.helper.strip_doc_string(model)
      model = onnx.shape_inference.infer_shapes(model)
      model = onnx.optimizer.optimize(model)
      onnx.checker.check_model(model)
      return model
docs: This function combines several useful utility functions together.