ResourceWarning: Implicitly cleaning up

Describe the bug
warning message from

python -W error -c "import monai"

with pytorch 2.0

Traceback (most recent call last):
  File "/usr/local/anaconda3/envs/py38/lib/python3.8/weakref.py", line 642, in _exitfunc
    f()
  File "/usr/local/anaconda3/envs/py38/lib/python3.8/weakref.py", line 566, in __call__
    return info.func(*info.args, **(info.kwargs or {}))
  File "/usr/local/anaconda3/envs/py38/lib/python3.8/tempfile.py", line 818, in _cleanup
    _warnings.warn(warn_message, ResourceWarning)
ResourceWarning: Implicitly cleaning up <TemporaryDirectory '/var/folders/6f/fdkl7m0x7sz3nj_t7p3ccgz00000gp/T/tmpqtvvcx_b'>

debugging further looks like it's triggered via importing pytorch ignite

  /usr/local/anaconda3/envs/py38/lib/python3.8/site-packages/ignite/handlers/checkpoint.py(17)<module>()
-> from torch.distributed.optim import ZeroRedundancyOptimizer
  <frozen importlib._bootstrap>(991)_find_and_load()
  <frozen importlib._bootstrap>(975)_find_and_load_unlocked()
  <frozen importlib._bootstrap>(671)_load_unlocked()
  <frozen importlib._bootstrap_external>(843)exec_module()
  <frozen importlib._bootstrap>(219)_call_with_frames_removed()
  /usr/local/anaconda3/envs/py38/lib/python3.8/site-packages/torch/distributed/optim/__init__.py(20)<module>()
-> from .named_optimizer import _NamedOptimizer
  <frozen importlib._bootstrap>(991)_find_and_load()
  <frozen importlib._bootstrap>(975)_find_and_load_unlocked()
  <frozen importlib._bootstrap>(671)_load_unlocked()
  <frozen importlib._bootstrap_external>(843)exec_module()
  <frozen importlib._bootstrap>(219)_call_with_frames_removed()
  /usr/local/anaconda3/envs/py38/lib/python3.8/site-packages/torch/distributed/optim/named_optimizer.py(10)<module>()
-> from torch.distributed._shard.sharded_tensor import ShardedTensor
  <frozen importlib._bootstrap>(991)_find_and_load()
  <frozen importlib._bootstrap>(961)_find_and_load_unlocked()
  <frozen importlib._bootstrap>(219)_call_with_frames_removed()
  <frozen importlib._bootstrap>(991)_find_and_load()
  <frozen importlib._bootstrap>(975)_find_and_load_unlocked()
  <frozen importlib._bootstrap>(671)_load_unlocked()
  <frozen importlib._bootstrap_external>(843)exec_module()
  <frozen importlib._bootstrap>(219)_call_with_frames_removed()
  /usr/local/anaconda3/envs/py38/lib/python3.8/site-packages/torch/distributed/_shard/__init__.py(1)<module>()
-> from .api import (
  <frozen importlib._bootstrap>(991)_find_and_load()
  <frozen importlib._bootstrap>(975)_find_and_load_unlocked()
  <frozen importlib._bootstrap>(671)_load_unlocked()
  <frozen importlib._bootstrap_external>(843)exec_module()
  <frozen importlib._bootstrap>(219)_call_with_frames_removed()
  /usr/local/anaconda3/envs/py38/lib/python3.8/site-packages/torch/distributed/_shard/api.py(6)<module>()
-> from torch.distributed._shard.sharded_tensor import (
  <frozen importlib._bootstrap>(991)_find_and_load()
  <frozen importlib._bootstrap>(975)_find_and_load_unlocked()
  <frozen importlib._bootstrap>(671)_load_unlocked()
  <frozen importlib._bootstrap_external>(843)exec_module()
  <frozen importlib._bootstrap>(219)_call_with_frames_removed()
  /usr/local/anaconda3/envs/py38/lib/python3.8/site-packages/torch/distributed/_shard/sharded_tensor/__init__.py(9)<module>()
-> from torch.distributed._shard.partial_tensor import _PartialTensor
  <frozen importlib._bootstrap>(991)_find_and_load()
  <frozen importlib._bootstrap>(975)_find_and_load_unlocked()
  <frozen importlib._bootstrap>(671)_load_unlocked()
  <frozen importlib._bootstrap_external>(843)exec_module()
  <frozen importlib._bootstrap>(219)_call_with_frames_removed()
  /usr/local/anaconda3/envs/py38/lib/python3.8/site-packages/torch/distributed/_shard/partial_tensor.py(8)<module>()
-> from torch.distributed.nn.functional import (
  <frozen importlib._bootstrap>(991)_find_and_load()
  <frozen importlib._bootstrap>(961)_find_and_load_unlocked()
  <frozen importlib._bootstrap>(219)_call_with_frames_removed()
  <frozen importlib._bootstrap>(991)_find_and_load()
  <frozen importlib._bootstrap>(975)_find_and_load_unlocked()
  <frozen importlib._bootstrap>(671)_load_unlocked()
  <frozen importlib._bootstrap_external>(843)exec_module()
  <frozen importlib._bootstrap>(219)_call_with_frames_removed()
  /usr/local/anaconda3/envs/py38/lib/python3.8/site-packages/torch/distributed/nn/__init__.py(3)<module>()
-> from .api.remote_module import RemoteModule
  <frozen importlib._bootstrap>(991)_find_and_load()
  <frozen importlib._bootstrap>(975)_find_and_load_unlocked()
  <frozen importlib._bootstrap>(671)_load_unlocked()
  <frozen importlib._bootstrap_external>(843)exec_module()
  <frozen importlib._bootstrap>(219)_call_with_frames_removed()
  /usr/local/anaconda3/envs/py38/lib/python3.8/site-packages/torch/distributed/nn/api/remote_module.py(24)<module>()
-> from torch.distributed.nn.jit import instantiator
  <frozen importlib._bootstrap>(1042)_handle_fromlist()
  <frozen importlib._bootstrap>(219)_call_with_frames_removed()
  <frozen importlib._bootstrap>(991)_find_and_load()
  <frozen importlib._bootstrap>(975)_find_and_load_unlocked()
  <frozen importlib._bootstrap>(671)_load_unlocked()
  <frozen importlib._bootstrap_external>(843)exec_module()
  <frozen importlib._bootstrap>(219)_call_with_frames_removed()
  /usr/local/anaconda3/envs/py38/lib/python3.8/site-packages/torch/distributed/nn/jit/instantiator.py(19)<module>()
-> _TEMP_DIR = tempfile.TemporaryDirectory()
  /usr/local/anaconda3/envs/py38/lib/python3.8/tempfile.py(781)__init__()
-> self._finalizer = _weakref.finalize(
> /usr/local/anaconda3/envs/py38/lib/python3.8/weakref.py(519)__init__()
-> if len(args) >= 3:

(fyi @vfdev-5 )

python -W error -c "import monai" で警告を再現し、PyTorch Ignite を経由して一時ディレクトリが作成される torch.distributed.nn.jit.instantiator.py までのインポートチェーンを調査します。MONAI がクリーンアップ警告の発生を回避できるかを確認します。完了条件は、インポートによって報告された ResourceWarning が発生しなくなることです。