Bcolz for fastai lib?

Has anyone used bcolz for the fastai library? I’m going to try to get the two to work together for my project, but I don’t want to duplicate anyone’s work.

Also, does anyone have ideas for the API? Maybe something like
data = ImageClassifierData.from_bcolz(PATH, bs=bs, tfms=tfms)
where PATH leads to a directory containing train.bc and valid.bc. Not sure what should be in train.bc. Maybe [[X, Y]] or [(x1, y1), (x2, y2), …]. I’ll need to understand ImageClassifierData better.