can't go over 40 iter

2023-07-21 14:54:32,235 [INFO] Saving checkpoint at iters 40 to /workspace/LAVIS/train_output/20230721145/checkpoint_40.pth.
Traceback (most recent call last):
  File "/workspace/LAVIS/train.py", line 112, in <module>
    main()
  File "/workspace/LAVIS/train.py", line 107, in main
    runner.train()
  File "/workspace/LAVIS/lavis/runners/runner_iter.py", line 132, in train
    dist.barrier()
  File "/usr/local/lib/python3.10/dist-packages/torch/distributed/distributed_c10d.py", line 3327, in barrier
    default_pg = _get_default_group()
  File "/usr/local/lib/python3.10/dist-packages/torch/distributed/distributed_c10d.py", line 707, in _get_default_group
    raise RuntimeError(
RuntimeError: Default process group has not been initialized, please make sure to call init_process_group.
Selection deleted