Fix arguments passed to predict function in QA Seq2seq training script (#21026)

fix args passed to predict function

examples/pytorch/question-answering/trainer_seq2seq_qa.py

@@ -151,7 +151,7 @@ class QuestionAnsweringSeq2SeqTrainer(Seq2SeqTrainer):
         if self.post_process_function is None or self.compute_metrics is None:
             return output
 
-        predictions = self.post_process_function(predict_examples, predict_dataset, output.predictions, "predict")
+        predictions = self.post_process_function(predict_examples, predict_dataset, output, "predict")
         metrics = self.compute_metrics(predictions)
 
         # Prefix all keys with metric_key_prefix + '_'