Add check for tied parameters (#24029)

* Add check for tied parameters

* Fix style

* fix style

* Fix versioning

* Change if to elif

src/transformers/modeling_utils.py

@@ -96,6 +96,10 @@ if is_accelerate_available():
         from accelerate.utils import get_balanced_memory
     else:
         get_balanced_memory = None
+    if version.parse(accelerate_version) > version.parse("0.19.0"):
+        from accelerate.utils import check_tied_parameters_on_same_device
+    else:
+        check_tied_parameters_on_same_device = None
 else:
     find_tied_parameters = None
 
@@ -2824,6 +2828,13 @@ class PreTrainedModel(nn.Module, ModuleUtilsMixin, GenerationMixin, PushToHubMix
                     )
                 del device_map_without_lm_head
 
+        elif device_map is not None:
+            model.tie_weights()
+            tied_params = find_tied_parameters(model)
+            # check if we don't have tied param in different devices
+            if check_tied_parameters_on_same_device is not None:
+                check_tied_parameters_on_same_device(tied_params, device_map)
+
         if from_tf:
             if resolved_archive_file.endswith(".index"):
                 # Load from a TensorFlow 1.X checkpoint - provided by original authors
@@ -3015,6 +3026,7 @@ class PreTrainedModel(nn.Module, ModuleUtilsMixin, GenerationMixin, PushToHubMix
         unexpected_keys = list(set(loaded_keys) - set(expected_keys))
 
         if find_tied_parameters is not None:
+            model.tie_weights()
             tied_params = find_tied_parameters(model)
         else:
             tied_params = []