Merge pull request #876 from wanghaoshuang/fix_params_grad

Fix params grad

fluid/ocr_recognition/crnn_ctc_model.py

@@ -193,8 +193,8 @@ def ctc_train_net(images, label, args, num_classes):
         learning_rate=args.learning_rate, momentum=args.momentum)
     _, params_grads = optimizer.minimize(sum_cost)
     model_average = fluid.optimizer.ModelAverage(
-        params_grads,
         args.average_window,
+        params_grads,
         min_average_window=args.min_average_window,
         max_average_window=args.max_average_window)