fix bug

internlm/solver/optimizer/hybrid_zero_optim.py

@@ -847,9 +847,11 @@ class HybridZeroOptimizer(BaseOptimizer):
 
     def broadcast_params(self, disable_overlap=False):
         handles = []
-        assert all(
-            isinstance(value, list) and not value for value in self._param_bcast_sync_handler._bcast_handles.values()
-        )
+        if self._overlap_sync_param:
+            assert all(
+                isinstance(value, list) and not value
+                for value in self._param_bcast_sync_handler._bcast_handles.values()
+            )
         for group_id in range(self.num_param_groups):
             for rank in range(self._zero_world_size[group_id]):
                 # The following operations are performed only on the rank to which parameters are assigned.