def METHOD_NAME():
    data = data1.copy()
    _loc = data.columns.get_loc
    data.iloc[0, _loc("y")] *= -1
    data.iloc[len(data) - 1, _loc("y")] *= -1
    p = (
        ggplot(data)
        + geom_col(aes("factor(x)", "y", fill="factor(y)"), position="stack")
        + geom_text(
            aes("factor(x)", "y", label="y"),
            position=position_stack(vjust=0.5),
        )
    )
    assert p == "stack-negative"