How to use multiple dataset with different sampling ratio

[jihwanp]

Hi I'm doing research using multiple dataset, and I noticed that detectron2 provide the multiple dataset loader.
However, one of my dataset should be learned more than other dataset, which means that sampling ratio should be somewhat like 2:1:1 (for triple dataset).
I noticed that just using naive multiple dataset loader makes the sampling ratio 1:1:1.
What config argument can handle this issue?

Thanks