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Use Parallel.spawn_kwargs as kwargs to the backend when appropriate #3493

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Use Parallel.spawn_kwargs as kwargs to the backend when appropriate #3493

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fbb8a27
Use `Parallel.spawn_kwargs` as kwargs to the backend when appropriate
qwfy Jan 16, 2026
1f1b035
Remove unreachable check
qwfy Jan 16, 2026
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6 changes: 5 additions & 1 deletion ignite/distributed/launcher.py
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Original file line number Diff line number Diff line change
Expand Up @@ -232,13 +232,17 @@ 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:
if nproc_per_node is not None:
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


# The logger will be setup after the idist.initialize() call
self._logger = None
Expand Down Expand Up @@ -319,7 +323,7 @@ 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__)
Expand Down