HELP: How to use multiple datasets

Any way to elegantly use multiple source datasets? e.g, there are dataset A and dataset B which is arranged in the same way, how to define databunch to read images from the two datasets A and B?

Or some ways like merage ImageList A and ImageList B to total ImageList C …?
Just like the ConcatDataset in Pytorch.

Got it, use add function in ItemList. Aggregate/Concat Datasets