def test_v1_8_0_torch_distributed_backend_env():
from pytorch_lightning.utilities.distributed import _get_process_group_backend_from_env
with pytest.deprecated_call(
match="Environment variable `PL_TORCH_DISTRIBUTED_BACKEND`"
" was deprecated in v1.6 and will be removed in v1.8."):
_get_process_group_backend_from_env()
def torch_distributed_backend(self) -> str:
"""Deprecated property."""
rank_zero_deprecation(
"ParallelStrategy.torch_distributed_backend was deprecated in v1.6 and will be removed in v1.8."
)
pg_backend = _get_process_group_backend_from_env()
if pg_backend:
return pg_backend
return get_default_process_group_backend_for_device(self.root_device)
def _get_process_group_backend(self):
return (
self._process_group_backend
or _get_process_group_backend_from_env()
or get_default_process_group_backend_for_device(self.root_device)
)
