torch default process group is not initialized

[cuge1995]

CloserLook3D/pytorch/utils/util.py", line 49, in reduce_tensor
    dist.all_reduce(rt, op=dist.ReduceOp.SUM)
  File "/python3.6/site-packages/torch/distributed/distributed_c10d.py", line 903, in all_reduce
    _check_default_pg()
  File "/python3.6/site-packages/torch/distributed/distributed_c10d.py", line 192, in _check_default_pg
    "Default process group is not initialized"
AssertionError: Default process group is not initialized

[zeliu98]

Hi @cuge1995, that's strange, can you show me more information about the error and your environment?