def METHOD_NAME():
    # ams, cbus, mops
    class_label_dict = {"mops": ["MOPS", "MOP"], "ams": ["ASSEMBLY MODEL", "AMS", "AM"],
                        "cbus": ["CHEMICAL BUILDING UNITS", "CBU", "CBUS"],
                        "gbus": ["GBU", "GENERIC BUILDING UNIT", "GBUS"]}
    class_label_list = list(set(itertools.chain.from_iterable([v for k, v in class_label_dict.items()])))
    label_class_dict = {}
    for class_key, label_list in class_label_dict.items():
        for label in label_list:
            label_class_dict[label] = class_key
    with open(os.path.join(dictionary_dir, "label_class_dict.json"), "w") as f:
        f.write(json.dumps(label_class_dict))
        f.close()
    with open(os.path.join(dictionary_dir, "class_label_list.json"), "w") as f:
        f.write(json.dumps(class_label_list))
        f.close()
    return class_label_list, label_class_dict