According to the iTunes Connect Developer Guide, the total uncompressed size of the app should be less than 4 GB (as of December 15, 2017); however, this applies only to the binary itself, while asset files can take as much space as the disk capacity allows. There is also a limit on app size for the cellular download, as stated on the Apple Developer site (https://developer.apple.com/news/?id=09192017b):
"We've increased the cellular download limit from 100 MB to 150 MB, letting customers download more apps from the App Store over their cellular network."
The simple conclusion is that you'd better store you model parameters as on-demand resources, or download them from your server after the app is already installed; but this is only one half of the problem. The other half is that you really don't want your app to take...
