Compute the smatch scores for a file list between two users
    Args:
    user1: user 1 name
    user2: user 2 name
    file_list: file list
    dir_pre: the file location prefix
    start_num: the number of restarts in smatch
    Returns:
    smatch f score.

def compute_files(user1, user2, file_list, dir_pre, start_num):

    """
    Compute the smatch scores for a file list between two users
    Args:
    user1: user 1 name
    user2: user 2 name
    file_list: file list
    dir_pre: the file location prefix
    start_num: the number of restarts in smatch
    Returns:
    smatch f score.

    """
    match_total = 0
    test_total = 0
    gold_total = 0
    for fi in file_list:
        file1 = dir_pre + user1 + "/" + fi + ".txt"
        file2 = dir_pre + user2 + "/" + fi + ".txt"
        if not os.path.exists(file1):
            print("*********Error: ", file1, "does not exist*********", file=ERROR_LOG)
            return -1.00
        if not os.path.exists(file2):
            print("*********Error: ", file2, "does not exist*********", file=ERROR_LOG)
            return -1.00
        try:
            file1_h = open(file1, "r")
            file2_h = open(file2, "r")
        except IOError:
            print("Cannot open the files", file1, file2, file=ERROR_LOG)
            break
        cur_amr1 = smatch.get_amr_line(file1_h)
        cur_amr2 = smatch.get_amr_line(file2_h)
        if cur_amr1 == "":
            print("AMR 1 is empty", file=ERROR_LOG)
            continue
        if cur_amr2 == "":
            print("AMR 2 is empty", file=ERROR_LOG)
            continue
        amr1 = amr.AMR.parse_AMR_line(cur_amr1)
        amr2 = amr.AMR.parse_AMR_line(cur_amr2)
        test_label = "a"
        gold_label = "b"
        amr1.rename_node(test_label)
        amr2.rename_node(gold_label)
        (test_inst, test_rel1, test_rel2) = amr1.get_triples()
        (gold_inst, gold_rel1, gold_rel2) = amr2.get_triples()
        if verbose:
            print("Instance triples of file 1:", len(test_inst), file=DEBUG_LOG)
            print(test_inst, file=DEBUG_LOG)
            print("Attribute triples of file 1:", len(test_rel1), file=DEBUG_LOG)
            print(test_rel1, file=DEBUG_LOG)
            print("Relation triples of file 1:", len(test_rel2), file=DEBUG_LOG)
            print(test_rel2, file=DEBUG_LOG)
            print("Instance triples of file 2:", len(gold_inst), file=DEBUG_LOG)
            print(gold_inst, file=DEBUG_LOG)
            print("Attribute triples of file 2:", len(gold_rel1), file=DEBUG_LOG)
            print(gold_rel1, file=DEBUG_LOG)
            print("Relation triples of file 2:", len(gold_rel2), file=DEBUG_LOG)
            print(gold_rel2, file=DEBUG_LOG)
        (best_match, best_match_num) = smatch.get_best_match(test_inst, test_rel1, test_rel2,
                                                             gold_inst, gold_rel1, gold_rel2,
                                                             test_label, gold_label)
        if verbose:
            print("best match number", best_match_num, file=DEBUG_LOG)
            print("Best Match:", smatch.print_alignment(best_match, test_inst, gold_inst), file=DEBUG_LOG)
        match_total += best_match_num
        test_total += (len(test_inst) + len(test_rel1) + len(test_rel2))
        gold_total += (len(gold_inst) + len(gold_rel1) + len(gold_rel2))
        smatch.match_triple_dict.clear()
    (precision, recall, f_score) = smatch.compute_f(match_total, test_total, gold_total)
    return "%.2f" % f_score