Map MXNet's Clip operator attributes to onnx's Clip operator
    and return the created node.

def convert_clip(node, **kwargs):
    """Map MXNet's Clip operator attributes to onnx's Clip operator
    and return the created node.
    """
    name, input_nodes, attrs = get_inputs(node, kwargs)

    a_min = np.float(attrs.get('a_min', -np.inf))
    a_max = np.float(attrs.get('a_max', np.inf))

    clip_node = onnx.helper.make_node(
        "Clip",
        input_nodes,
        [name],
        name=name,
        min=a_min,
        max=a_max
    )
    return [clip_node]