Apply suggestions from code review

Co-authored-by: Justus Schock <[email protected]>

Author: four4fish

pytorch_lightning/trainer/connectors/accelerator_connector.py

@@ -211,7 +211,8 @@ def _init_deterministic(self, deterministic: bool) -> None:
         if deterministic:
             # fixing non-deterministic part of horovod
             # https://github.com/PyTorchLightning/pytorch-lightning/pull/1572/files#r420279383
-            os.environ["HOROVOD_FUSION_THRESHOLD"] = str(0)
+            os.environ["HOROVOD_FUSION_THRESHOLD"] = "0"
+
             # https://docs.nvidia.com/cuda/cublas/index.html#cublasApi_reproducibility
             os.environ["CUBLAS_WORKSPACE_CONFIG"] = ":4096:8"