This is my first Deep Learning library on iOS.
There are some alternatives like:Apple's Core ML (only support iOS10), Deep learning kit(released a long time ago, a lot of layers aren't supported), Bender(needs iOS 10.0+), Forge(needs Apple's MPSCNN framework, iOS10+).
My library only needs iOS8, I rewrote all layers using Metal and support some new layers (such as TrasposedConvolution, DilatedConvolution). I will also update the library to support some new features of Deep Learning.
Thank you for your reply, if you like it, you can recommend to someone else who develop apps on iOS.