Revert "search buffers for dtype" (huggingface#23308)

Revert "search buffers for dtype (huggingface#23159)"

This reverts commit ef42c2c.

src/transformers/modeling_utils.py

@@ -207,29 +207,21 @@ def get_parameter_dtype(parameter: Union[nn.Module, GenerationMixin, "ModuleUtil
         # if no floating dtype was found return whatever the first dtype is
         return last_dtype
 
-    for t in parameter.buffers():
-        last_dtype = t.dtype
-        if t.is_floating_point():
-            return t.dtype
-
-    if last_dtype is not None:
-        # if no floating dtype was found return whatever the first dtype is
-        return last_dtype
-
-    # For nn.DataParallel compatibility in PyTorch > 1.5
-    def find_tensor_attributes(module: nn.Module) -> List[Tuple[str, Tensor]]:
-        tuples = [(k, v) for k, v in module.__dict__.items() if torch.is_tensor(v)]
-        return tuples
-
-    gen = parameter._named_members(get_members_fn=find_tensor_attributes)
-    last_tuple = None
-    for tuple in gen:
-        last_tuple = tuple
-        if tuple[1].is_floating_point():
-            return tuple[1].dtype
+    else:
+        # For nn.DataParallel compatibility in PyTorch > 1.5
+        def find_tensor_attributes(module: nn.Module) -> List[Tuple[str, Tensor]]:
+            tuples = [(k, v) for k, v in module.__dict__.items() if torch.is_tensor(v)]
+            return tuples
 
-    # fallback to the last dtype
-    return last_tuple[1].dtype
+        gen = parameter._named_members(get_members_fn=find_tensor_attributes)
+        last_tuple = None
+        for tuple in gen:
+            last_tuple = tuple
+            if tuple[1].is_floating_point():
+                return tuple[1].dtype
+
+        # fallback to the last dtype
+        return last_tuple[1].dtype
 
 
 def get_state_dict_float_dtype(state_dict):