subprocess.CalledProcessError: Command ‘[‘hostname‘, ‘--fqdn‘]‘ returned non-zero exit status 1._raise calledprocesserror(retcode, process.args, su

最近复现Bytetrack代码遇到很多神奇的BUG，第一次可以run，第二次可能就不行了，可能是我记不得我改了啥吧。例如，今天我在run代码想要训练的时候，就出了这个错误

sethostname: 使用网络控制面板小程序设置 hostname。 
不支持 hostname -s。
Traceback (most recent call last):
  File "D:\lyc\Bytetrack\tools\train.py", line 115, in <module>
    launch(
  File "d:\lyc\bytetrack\yolox\core\launch.py", line 80, in launch
    launch_by_subprocess(
  File "d:\lyc\bytetrack\yolox\core\launch.py", line 109, in launch_by_subprocess
    master_ip = subprocess.check_output(["hostname", "--fqdn"]).decode("utf-8")
  File "D:\lyc\Anaconda\envs\Bytetrack\lib\subprocess.py", line 421, in check_output
    return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
  File "D:\lyc\Anaconda\envs\Bytetrack\lib\subprocess.py", line 526, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['hostname', '--fqdn']' returned non-zero exit status 1.
我上网查了好多资料，发现对我都没有用，然后我想起来了我train文件的num_machines一开始设为4了，然后改为1就好了

parser.add_argument(
    "--num_machines", default=1, type=int, help="num of node for training"
)
最后，成功运行