Remove hardcoding of rank_zero_only.rank in accelerator connector (#6878)

(cherry picked from commit 968ac09)

Author: ananthsub

CHANGELOG.md

@@ -170,7 +170,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 ### Fixed
 
-- Set better defaults for `rank_zero_only.rank` when training is launched with SLURM and torchelastic ([#6802](https://github.com/PyTorchLightning/pytorch-lightning/pull/6802/))
+- Set better defaults for `rank_zero_only.rank` when training is launched with SLURM and torchelastic:
+    * Support SLURM and torchelastic global rank environment variables ([#5715](https://github.com/PyTorchLightning/pytorch-lightning/pull/5715))
+    * Remove hardcoding of local rank in accelerator connector ([#6878](https://github.com/PyTorchLightning/pytorch-lightning/pull/6878))
 
 
 - Sanitize `None` params during pruning ([#6836](https://github.com/PyTorchLightning/pytorch-lightning/pull/6836))

pytorch_lightning/trainer/connectors/accelerator_connector.py

@@ -53,7 +53,6 @@
     device_parser,
     DeviceType,
     DistributedType,
-    rank_zero_only,
 )
 from pytorch_lightning.utilities.distributed import rank_zero_info, rank_zero_warn
 from pytorch_lightning.utilities.exceptions import MisconfigurationException
@@ -106,12 +105,6 @@ def __init__(
         self._training_type_plugin: Optional[TrainingTypePlugin] = None
         self._cluster_environment: Optional[ClusterEnvironment] = None
 
-        # init the default rank if exists
-        # we need to call this here or NVIDIA flags and other messaging in init will show on all ranks
-        # this way we only show it on rank 0
-        if "LOCAL_RANK" in os.environ:
-            rank_zero_only.rank = int(os.environ["LOCAL_RANK"])
-
         # for gpus allow int, string and gpu list
         if auto_select_gpus and isinstance(gpus, int):
             self.gpus = pick_multiple_gpus(gpus)