zhaojing

Results 3 issues of zhaojing

![image](https://user-images.githubusercontent.com/26590396/137580734-ced9686f-ca18-4f7f-a3b7-4053819ac854.png) When I see the code, I can't figure the fule of parameters, Can you explain??

Thanks for great work! Has the performance improved on semantic segmentation?

If my own dataset has only 2classes of cityscape format, How can I make it run ??