Fix missing methods for Fuyu (#31880)

* add missing methods for FuyuForCausalLM

* fix a typo

* format code

* add missing tie_weights

* format code

src/transformers/models/fuyu/modeling_fuyu.py

@@ -168,6 +168,21 @@ class FuyuForCausalLM(FuyuPreTrainedModel):
     def set_input_embeddings(self, value):
         self.language_model.set_input_embeddings(value)
 
+    def get_output_embeddings(self):
+        return self.language_model.get_output_embeddings()
+
+    def set_output_embeddings(self, new_embeddings):
+        self.language_model.set_output_embeddings(new_embeddings)
+
+    def set_decoder(self, decoder):
+        self.language_model.set_decoder(decoder)
+
+    def get_decoder(self):
+        return self.language_model.get_decoder()
+
+    def tie_weights(self):
+        return self.language_model.tie_weights()
+
     def resize_token_embeddings(self, new_num_tokens: Optional[int] = None, pad_to_multiple_of=None) -> nn.Embedding:
         # TODO: config.vocab_size is deprecated and will be removed in v4.43.
         # `resize_token_embeddings` should work from `modeling_utils.py``