On documenting the shapes/size of arrays/tensors being passed to methods of FastAI

Yes! I find math best represented visually so I imagine some sort of augmented debugger that allows one to hover over elements as they run and see the geometric representation, or augment summary() to output something akin to what @chloews did with her visualization: http://forums.fast.ai/t/part-2-lesson-9-in-class/14028/375