a571-op

Results 2 issues of a571-op

When fix patch is applied to my dataset, the dataset is unbalanced. Why does the training set perform well, but the loss of verification set first decreases and then keeps...

![image](https://user-images.githubusercontent.com/76274232/102835427-a65b0000-4431-11eb-8544-934fae55a45c.png) ![image](https://user-images.githubusercontent.com/76274232/102835446-b672df80-4431-11eb-84b4-c29ababfddfc.png)