add annotation

Author: FeixLiu

python/paddle/distributed/auto_parallel/api.py

@@ -196,6 +196,7 @@ def lazy_init_hook(param, origin_hook):
                 # lazy init hook with randomness controlling
                 def _init_func(var, block):
                     if dist.get_rank() not in param.process_mesh.process_ids:
+                        # None calc rank, just return no init.
                         return
                     # get the unique rng name
                     rng_name = determinate_rng(