small refactoring (only esthetic, not functional)

transformers/modeling_encoder_decoder.py

@@ -191,13 +191,14 @@ class PreTrainedEncoderDecoder(nn.Module):
 
             assert(len(os.listdir(save_directory)) == 0) # sanity check
 
+        # Create the "encoder" directory inside the output directory and save the encoder into it
         if not os.path.exists(os.path.join(save_directory, "encoder")):
             os.mkdir(os.path.join(save_directory, "encoder"))
+        self.encoder.save_pretrained(os.path.join(save_directory, "encoder"))
 
+        # Create the "encoder" directory inside the output directory and save the decoder into it
         if not os.path.exists(os.path.join(save_directory, "decoder")):
             os.mkdir(os.path.join(save_directory, "decoder"))
-
-        self.encoder.save_pretrained(os.path.join(save_directory, "encoder"))
         self.decoder.save_pretrained(os.path.join(save_directory, "decoder"))
 
     def forward(self, encoder_input_ids, decoder_input_ids, **kwargs):