Hey, thanks for your reply.
Specifically, in my simplified test example, opt.world_size=33, opt.num_servers = 2, opt.num_envs_each_server=16, NUM_TRAINER_PROCESSES=1.
It does not work when modifying the value of num_worker_threads.
When using init_process_group, clients are successfully initialized, but the server still gets stuck in init_process_group.