[Marian Fixes] prevent predicting pad_token_id before softmax, support language codes, name multilingual models (#4290)

src/transformers/modeling_bart.py

@@ -980,12 +980,12 @@ class BartForConditionalGeneration(PretrainedBartModel):
             "use_cache": use_cache,  # change this to avoid caching (presumably for debugging)
         }
 
-    def prepare_scores_for_generation(self, scores, cur_len, max_length):
+    def prepare_logits_for_generation(self, logits, cur_len, max_length):
         if cur_len == 1:
-            self._force_token_ids_generation(scores, self.config.bos_token_id)
+            self._force_token_ids_generation(logits, self.config.bos_token_id)
         if cur_len == max_length - 1 and self.config.eos_token_id is not None:
-            self._force_token_ids_generation(scores, self.config.eos_token_id)
-        return scores
+            self._force_token_ids_generation(logits, self.config.eos_token_id)
+        return logits
 
     def _force_token_ids_generation(self, scores, token_ids) -> None:
         """force one of token_ids to be generated by setting prob of all other tokens to 0"""