def METHOD_NAME(cfg):
    """
    Check the correctness of the configuration file. Log error and exit
    when Config is not compliant.
    """
    err = "'{}' not specified in config file. Please set it in config file."
    check_list = ['architecture', 'num_classes']
    try:
        for var in check_list:
            if not var in cfg:
                logger.error(err.format(var))
                sys.exit(1)
    except Exception as e:
        pass
    if 'log_iter' not in cfg:
        cfg.log_iter = 20
    return cfg