The MMD_distance in train.py is not used

[liyangfan0]

Dear author, I notice that the MMD_distance and choice_topk is not used in train.py. Can you please point out where is the Source Instances Division part in the code?

[Hlings]

Hi. Thanks for your reminder! I might have mixed up the train.py file while organizing. I have corrected the code following a similar type here. Please try again and feel free to contact me if any other problems exist :)