code: def import_model(model_file):
      
      graph = GraphProto()
  
      try:
          import onnx
      except ImportError:
          raise ImportError("Onnx and protobuf need to be installed. "
                            + "Instructions to install - https://github.com/onnx/onnx")
      # loads model file and returns ONNX protobuf object
      model_proto = onnx.load_model(model_file)
      sym, arg_params, aux_params = graph.from_onnx(model_proto.graph)
      return sym, arg_params, aux_params
docs: Imports the ONNX model file, passed as a parameter, into MXNet symbol and parameters.
      Operator support and coverage -
      https://cwiki.apache.org/confluence/display/MXNET/MXNet-ONNX+Integration
  
      Parameters
      ----------
      model_file : str
          ONNX model file name
  
      Returns
      -------
      sym : :class:`~mxnet.symbol.Symbol`
          MXNet symbol object
  
      arg_params : dict of ``str`` to :class:`~mxnet.ndarray.NDArray`
          Dict of converted parameters stored in ``mxnet.ndarray.NDArray`` format
  
      aux_params : dict of ``str`` to :class:`~mxnet.ndarray.NDArray`
          Dict of converted parameters stored in ``mxnet.ndarray.NDArray`` format
  
      Notes
      -----
      This method is available when you ``import mxnet.contrib.onnx``