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

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

    probability = float(attrs.get("p", 0.5))

    dropout_node = onnx.helper.make_node(
        "Dropout",
        input_nodes,
        [name],
        ratio=probability,
        name=name
    )
    return [dropout_node]