def METHOD_NAME(old_dic, num_spkrs=2):
    perm, keys = permutation_schemes(num_spkrs)
    new_dic = {}
    for id in old_dic.keys():
        # compute error rate for each utt
        in_dic = old_dic[id]
        score = convert_score(perm, in_dic)
        perm_score = []
        for ks in keys:
            tmp_score = [0, 0, 0, 0]
            for k in ks:
                tmp_score = [tmp_score[i] + score[k][i] for i in range(4)]
            perm_score.append(tmp_score)
        error_rate = [
            sum(s[1:4]) / float(sum(s[0:3])) for s in perm_score
        ]  # (s+d+i) / (c+s+d)
        min_idx, min_v = min(enumerate(error_rate), key=lambda x: x[1])
        dic = {}
        for k in keys[min_idx]:
            dic[k] = in_dic[k]
        dic["Scores"] = "(#C #S #D #I) " + " ".join(map(str, perm_score[min_idx]))
        new_dic[id] = dic
    return new_dic