Update seed.py

Author: amorehead

src/lightning/fabric/utilities/seed.py

@@ -91,8 +91,9 @@ def pl_worker_init_function(worker_id: int, rank: Optional[int] = None) -> None:
 
     """
     # implementation notes: https://github.com/pytorch/pytorch/issues/5059#issuecomment-817392562
+    assert "PL_GLOBAL_SEED" in os.environ, "`seed_everything(seed, workers=True)` must be called before training to use this function."
     global_rank = rank if rank is not None else rank_zero_only.rank
-    process_seed = torch.initial_seed()
+    process_seed = int(os.environ["PL_GLOBAL_SEED"])
     # back out the base seed so we can use all the bits
     base_seed = process_seed - worker_id
     log.debug(