fixed ddp flag crash (#3927)

Lightning-AI · Oct 7, 2020 · af5887c · af5887c
1 parent 9928125
commit af5887c
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/pytorch_lightning/accelerators/ddp_backend.py b/pytorch_lightning/accelerators/ddp_backend.py
@@ -117,7 +117,7 @@ def _call_children_scripts(self):
             env_copy['LOCAL_RANK'] = f'{local_rank}'
             env_copy['PL_DDP_PID'] = str(self.trainer.data_parallel_device_ids[local_rank])
             # remove env var if global seed not set
-            if os.environ.get('PL_GLOBAL_SEED') is None:
+            if os.environ.get('PL_GLOBAL_SEED') is None and 'PL_GLOBAL_SEED' in env_copy:
                 del env_copy['PL_GLOBAL_SEED']
 
             # start process