DeepLearningKit: Open source framework for Apple platforms using Swift

Possibly dumb question, how is this different/related to the Apple-provided BNNS library ("Basic neural networks subroutines")? https://developer.apple.com/videos/play/wwdc2016-715/?time=1...

It seems that it is based on Metal instead of Accelerate framework.

This is great work. What's the challenge in making this cross platform, I.e. adding Android support via Vulcan

Another possilby dumb question: What kind of app would use this?

Tons, like the prisma app.