Some questions about the configuration of RPN_BATCHSIZE, BATCH_SIZE and batch_size

[Tom-Cat-God]

In the cfgs folder, what is the difference between RPN_BATCHSIZE, BATCH_SIZE in res101.yml and batch_size in trainval_net.py?

Can I set the BATCH_SIZE of res101.yml to 1, and what are the consequences?

And, what are the consequences of changing RPN_BATCHSIZE?