def print_scores_cv(scores, print_timing=False):
    """
    Print the scores returned by sklearn.model_selection.cross_validate.
    Parameters
    ==========
    print_timing : bool, default=False
        If True, print also 'fit_time' and 'score_time'
    Returns
    =======
    None
    """
    for name, vector in scores.items():
        if print_timing:
            print('{}: {:.2f} +- {:.2f}'.format(name, vector.mean(),
                                                vector.std(ddof=1)))
        else:
            if name not in ['fit_time', 'score_time']:
                print('{}: {:.2f} +- {:.2f}'.format(name, vector.mean(),
                                                    vector.std(ddof=1)))
    return None