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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def import_model(model_file):
 """Imports the supplied ONNX model file into MXNet symbol and parameters. Parameters model_file : ONNX model file name Returns ------- sym : mx.symbol Compatible mxnet symbol params : dict of str to mx.ndarray Dict of converted parameters stored in mx.ndarray format """

    graph = GraphProto()

    # loads model file and returns ONNX protobuf object
    model_proto = onnx.load(model_file)
    sym, params = graph.from_onnx(model_proto.graph)
    return sym, params