[PyTorch] Refactor Resize Token Embeddings (#8880)

* fix resize tokens

* correct mobile_bert

* move embedding fix into modeling_utils.py

* refactor

* fix lm head resize

* refactor

* break lines to make sylvain happy

* add news tests

* fix typo

* improve test

* skip bart-like for now

* check if base_model = get(...) is necessary

* clean files

* improve test

* fix tests

* revert style templates

* Update templates/adding_a_new_model/cookiecutter-template-{{cookiecutter.modelname}}/modeling_{{cookiecutter.lowercase_modelname}}.py

src/transformers/models/ctrl/modeling_ctrl.py

@@ -496,6 +496,9 @@ class CTRLLMHeadModel(CTRLPreTrainedModel):
     def get_output_embeddings(self):
         return self.lm_head
 
+    def set_output_embeddings(self, new_embeddings):
+        self.lm_head = new_embeddings
+
     def prepare_inputs_for_generation(self, input_ids, past=None, use_cache=None, **kwargs):
         # only last token for inputs_ids if past is defined in kwargs
         if past: