Update on "[c10d] Update backend arg documentation"

kwen2501 · kwen2501 · commit cbf41312d9b0 · 2024-12-09T11:58:08.000-08:00
Update doc to reflect change brought by #142216 cc H-Huang awgu wanchaol fegin fduwjj wz337 wconstab d4l3k c-p-i-o [ghstack-poisoned]
diff --git a/torch/distributed/distributed_c10d.py b/torch/distributed/distributed_c10d.py
@@ -1544,10 +1544,10 @@ def init_process_group(
             build-time configurations, valid values include ``mpi``, ``gloo``,
             ``nccl``, ``ucc``, or one that is registered by a third-party
             plugin.
-            If ``backend`` is not provided, c10d will use a backend registered
-            for the device type indicated by the `device_id` kwarg (if
-            provided). The known default registrations today are: ``nccl`` for
-            ``cuda``, ``gloo`` for ``cpu``.
+            Since 2.6, if ``backend`` is not provided, c10d will use a backend
+            registered for the device type indicated by the `device_id` kwarg
+            (if provided). The known default registrations today are: ``nccl``
+            for ``cuda``, ``gloo`` for ``cpu``.
             If neither ``backend`` nor ``device_id`` is provided, c10d will
             detect the accelerator on the run-time machine and use a backend
             registered for that detected accelerator (or ``cpu``).
