From fbb8a27317815344da90d5c33f0563aaaabc8071 Mon Sep 17 00:00:00 2001
From: Wanqiang <incomplete@aixon.co>
Date: Fri, 16 Jan 2026 21:19:09 +0800
Subject: [PATCH 1/2] Use `Parallel.spawn_kwargs` as kwargs to the backend when
 appropriate

---
 ignite/distributed/launcher.py | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/ignite/distributed/launcher.py b/ignite/distributed/launcher.py
index 324533c618c5..e9564cc2715b 100644
--- a/ignite/distributed/launcher.py
+++ b/ignite/distributed/launcher.py
@@ -232,6 +232,7 @@ def __init__(
 
         self.backend = backend
         self._spawn_params = None
+        self._pg_init_kwargs = None
         self.init_method = init_method
 
         if self.backend is not None:
@@ -239,6 +240,11 @@ def __init__(
                 self._spawn_params = self._setup_spawn_params(
                     nproc_per_node, nnodes, node_rank, master_addr, master_port, init_method, **spawn_kwargs
                 )
+            else:
+                self._pg_init_kwargs = spawn_kwargs
+                if "init_method" in self._pg_init_kwargs:
+                    raise ValueError("Argument 'init_method' should not be specified in 'spawn_kwargs'")
+
 
         # The logger will be setup after the idist.initialize() call
         self._logger = None
@@ -319,7 +325,7 @@ def training(local_rank, config, **kwargs):
 
     def __enter__(self) -> "Parallel":
         if self.backend is not None and self._spawn_params is None:
-            idist.initialize(self.backend, init_method=self.init_method)
+            idist.initialize(self.backend, init_method=self.init_method, **(self._pg_init_kwargs or dict()))
 
         # The logger can be setup from now since idist.initialize() has been called (if needed)
         self._logger = setup_logger(__name__ + "." + self.__class__.__name__)

From 1f1b035cecc86c13af41ad1b43330d7b31dc9a84 Mon Sep 17 00:00:00 2001
From: Wanqiang <incomplete@aixon.co>
Date: Fri, 16 Jan 2026 21:34:10 +0800
Subject: [PATCH 2/2] Remove unreachable check

---
 ignite/distributed/launcher.py | 2 --
 1 file changed, 2 deletions(-)

diff --git a/ignite/distributed/launcher.py b/ignite/distributed/launcher.py
index e9564cc2715b..7fceb07cda5a 100644
--- a/ignite/distributed/launcher.py
+++ b/ignite/distributed/launcher.py
@@ -242,8 +242,6 @@ def __init__(
                 )
             else:
                 self._pg_init_kwargs = spawn_kwargs
-                if "init_method" in self._pg_init_kwargs:
-                    raise ValueError("Argument 'init_method' should not be specified in 'spawn_kwargs'")
 
 
         # The logger will be setup after the idist.initialize() call