How to distribute a learner over multiple GPUs in fastai V2?

Hi everybody,

I want to distribute a cnn_learner over 2 GPUs in fastai V2. How can I achieve this goal? Is it possible to print some stats during learning? The initial code looks like this:

learn = cnn_learner(dls, resnet34, metrics=accuracy)
learn.fine_tune(4)

Thanks for helping!

Best

Felix