def METHOD_NAME(model_store=None):
    print(f"## Starting gen_mar: {model_store}\n")
    if len(mar_set) == 0:
        generate_mars(mar_config=MAR_CONFIG_FILE_PATH, model_store_dir=MODEL_STORE_DIR)
    if model_store is not None and os.path.exists(model_store):
        print("## Create symlink for mar files\n")
        for mar_file in mar_set:
            src = f"{MODEL_STORE_DIR}/{mar_file}"
            dst = f"{model_store}/{mar_file}"
            if os.path.exists(dst):
                print(f"## {dst} already exists.\n")
            else:
                os.symlink(src, dst)
                print(f"## Symlink {src}, {dst} successfully.")