<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def main():
 """Command line interface of mpu."""

    parser = get_parser()
    args = parser.parse_args()
    if hasattr(args, 'func') and args.func:
        args.func(args)
    else:
        parser.print_help()