Lack of introduction documents

Hi, are there any simple ways to know what the framework can do, without having to dive into the codes?
A document describing what kind of computations are supported (e.g. vertical or horizontal splitted databases? Neural networks or tree models ? Inference or training ? ) and giving example links for each kind would be very helpful.

There are some examples under /example/, but it's not clear which kind of computations they belong to, or are they the only type of computations supported.