[TF models] Common attributes as per #1721

transformers/modeling_tf_utils.py

@@ -65,6 +65,21 @@ class TFPreTrainedModel(tf.keras.Model):
         # Save config in model
         self.config = config
 
+    def get_input_embeddings(self):
+        """ Get model's input embeddings
+        """
+        base_model = getattr(self, self.base_model_prefix, self)
+        if base_model is not self:
+            return base_model.get_input_embeddings()
+        else:
+            raise NotImplementedError
+
+    def get_output_embeddings(self):
+        """ Get model's output embeddings
+            Return None if the model doesn't have output embeddings
+        """
+        return None  # Overwrite for models with output embeddings
+
     def _get_resized_embeddings(self, old_embeddings, new_num_tokens=None):
         """ Build a resized Embedding Variable from a provided token Embedding Module.
             Increasing the size will add newly initialized vectors at the end