accelerate

cf745c93 - check port availability only in main deepspeed/torchrun launcher (#2078)

check port availability only in main deepspeed/torchrun launcher (#2078) * check port availability only in main deepspeed launcher * check port availability only in main launcher for deepspeed/torchrun * Update launch.py add comments --------- Co-authored-by: 聂靖入 <niejingru@bytedance.com>