code: def set_model_domain(model, domain):
      
      if model is None or not isinstance(model, onnx_proto.ModelProto):
          raise ValueError("Model is not a valid ONNX model.")
      if not convert_utils.is_string_type(domain):
          raise ValueError("Domain must be a string type.")
      model.domain = domain
docs: Sets the domain on the ONNX model.
  
      :param model: instance of an ONNX model
      :param domain: string containing the domain name of the model
  
      Example:
  
      ::
          from onnxmltools.utils import set_model_domain
          onnx_model = load_model("SqueezeNet.onnx")
          set_model_domain(onnx_model, "com.acme")