def validate_basic_smoother_resid():
    """Compare residuals."""
    x, y = sort_data(*smoother_friedman82.build_sample_smoother_problem_friedman82())
    plt.figure()
    for span in smoother.DEFAULT_SPANS:
        my_smoother = smoother.perform_smooth(x, y, span)
        _friedman_smooth, resids = run_friedman_smooth(x, y, span)  # pylint: disable=unused-variable
        plt.plot(x, my_smoother.cross_validated_residual, '.-',
                 label='pyace span = {0}'.format(span))
        plt.plot(x, resids, '.-', label='Friedman span = {0}'.format(span))
    finish_plot()
Compare residuals.