The ratio is smaller the better

def _ratio_scores(parameters_value, clusteringmodel_gmm_good, clusteringmodel_gmm_bad):
    '''
    The ratio is smaller the better
    '''
    ratio = clusteringmodel_gmm_good.score([parameters_value]) / clusteringmodel_gmm_bad.score([parameters_value])
    sigma = 0
    return ratio, sigma