Windows下运行多线程Multiprocess出错

Process传入Target：client_train,以及它的参数，只有当传入的参数包含server_id的时候回报错，报错如下：

报错内容：

Traceback (most recent call last):
  File "", line 1, in
  File "F:Anacondaenvspytorchlibmultiprocessingspawn.py", line 116, in spawn_main
    exitcode = _main(fd, parent_sentinel)
  File "F:Anacondaenvspytorchlibmultiprocessingspawn.py", line 126, in _main
    self = reduction.pickle.load(from_parent)
AttributeError: Can't get attribute 'client_train' on

请教各为路过的大神，可有解决方案呢？