Part 1: Introduce multi-node SPMD support for Neuron (#8204) (#8224)

Co-authored-by: Rui <[email protected]>

torch_xla/runtime.py

@@ -253,6 +253,15 @@ def use_spmd(auto: Optional[bool] = False):
     torch_xla._XLAC._xla_set_auto_sharding()
     os.environ["XLA_AUTO_SPMD"] = "1"
 
+  if device_type() == 'NEURON':
+    # In case of Neuron, reset the initialization environment to accommodate SPMD.
+    try:
+      from torch_neuronx.initialization import initialize
+
+      initialize()
+    except ImportError:
+      pass
+
 
 def is_spmd():
   """Returns if SPMD is set for execution."""