XCode 12 consequences on my model

[timocafe]

❓Question

During the night my Xcode has been updated, and currently I am not anymore able to initialize my model in swift.
I get the error:

Type 'MLModel' has no member '__loadContents'

A user reports similar issue in StackOverflow: https://stackoverflow.com/questions/63917164/ml-build-error-for-catalyst-xcode-12-gm

my workflow

Convert my own model developed/obtained using TF. Plug it to Hello World MacOS swift App

swift code

let encoder: generic_4 = {
    do {
        let config = MLModelConfiguration()
        return try generic_4(configuration: config)
    } catch {
        print(error)
        fatalError("Couldn't create encoder model")
    }
}()

System Information

• Catalina 10.15.6
• Python homeBrew 3.8.5
• TF 2.3
• CoreTool 4.0b3
• Xcode 12 - 12A7209

[baaj2109]

same error

[anilkatti]

@baaj2109 @timocafe unfortunately, I have been able to repro this with the latest Xcode. I am trying to gather some information so I could repro this issue myself. Did you install Xcode via Mac app store? Is your app iOS, Mac or Catalyst?

[timocafe]

Hello, thank you very much for the fast answer. I am dinosaur C++ dev, but baby MacOS. The app was for MacOS only. I just try to load the models by the code, I described on the top. The update was automatic, my Xcode version was updated during night. I did not try to delete and redownload from the App Store.

[anilkatti]

I don't see any issue in your steps. All seems reasonable. We will keep looking.

[anilkatti]

@timocafe what is the macOS deployment target set to in Project -> Info -> Deployment Target?

[baaj2109]

thank you for reply. my Xcode version is Xcode_12_GM_seed(12A7209) and download from developer.apple.com. The app is for Mac

[anilkatti]

@baaj2109 @timocafe we root-caused this to a mismatch in SDKs in Xcode 12.0 GM. The official note on https://developer.apple.com/download/release/:

Xcode 12 includes everything you need to create amazing apps for all Apple platforms. Includes the latest SDKs for iOS, watchOS, and tvOS, and macOS Catalina. For development on macOS Big Sur or to support Apple silicon, continue to use Xcode 12 beta 6.

CoreML compiler in Xcode 12.0 GM is generating code that has symbols available only on macOS BigSur causing the compilation issue. If the goal is to build a catalyst or macOS-only app with Xcode 12.0, please follow this workaround:

Turn off code generation in the project, use xcrun coremlcompiler generate <YourModel.mlmodel> --language Swift to generate the code manually and then remove the offending method and add that swift file to their project.

This issue is resolved with latest beta release of Xcode 12.2, which can be found here: https://developer.apple.com/services-account/download?path=/Developer_Tools/Xcode_12.2_beta/Xcode_12.2_beta.xip

[timocafe]

Indeed it works, I turnoff the CoreML generation, and import the code manually. Thank you, have a good day

[oskarko]

How can I generate swift classes?
xcrun coremlcompiler generate <YourModel.mlmodel> —lang Swift
always create ObjC classes...

[msiracusa]

I believe it may be —language Swift. Please give that a try or consult xcrun coremlcompiler -h

[anilkatti]

Sorry @oskarko - my mistake. I fixed the earlier comment. Here's the correct command line arguments.

xcrun coremlcompiler generate <YourModel.mlmodel> --language Swift

[vizaiapp]

How does one disable code generation for coreml models?

[msiracusa]

To disable code generation in Xcode 12 you should be able to:

• Click on your .mlmodel in the left hand navigator
• Show the file inspector on the right
• In the Target Membership section of the file inspector go to the associated target and choose "No Generated Classes"

Alternatively I believe in your targets build settings you can set COREML_CODEGEN_LANGUAGE to "None"

[vizaiapp]

Thank you, @msiracusa !

[v1ergar]

@anilkatti I did exactly this and now i get an error: Cannot call value non-function type 'module<...>'. I am a noob