Continuously train CoreML model after shipping

Apple has recently added a new API for on-device model compilation. Now you can download your model and compile it on device

The .mlmodel file is compiled by Xcode into a .mlmodelc structure (which is actually a folder inside your app bundle).

Your app might be able to download a new .mlmodel from a server but I don't think you can run the Core ML compiler from inside your app.

Maybe it is possible for your app to download the compiled .mlmodelc data from a server, copy it into the app's Documents directory, and instantiate the model from that. Try it out. ;-)

(This assumes the App Store does not do any additional processing on the .mlmodelc data before it packages up your app and ships it to the user.)