code: def import_to_gluon(model_file, ctx):
      
      graph = GraphProto()
      try:
          import onnx
      except ImportError:
          raise ImportError("Onnx and protobuf need to be installed. Instructions to"
                            + " install - https://github.com/onnx/onnx#installation")
      model_proto = onnx.load_model(model_file)
      net = graph.graph_to_gluon(model_proto.graph, ctx)
      return net
docs: Imports the ONNX model files, passed as a parameter, into Gluon SymbolBlock object.
  
      Parameters
      ----------
      model_file : str
          ONNX model file name
      ctx : Context or list of Context
          Loads the model into one or many context(s).
  
      Returns
      -------
      sym_block : :class:`~mxnet.gluon.SymbolBlock`
          A SymbolBlock object representing the given model file.
  
      Notes
      -----
      This method is available when you ``import mxnet.contrib.onnx``