[Bug] NativeContextualEmbeddings causes crash

[Kilo-Loco]

I have attempted to switch from using NativeEmbeddings to NativeContextualEmbeddings and it is causing my iOS app to crash. It seems that the embeddings object is failing to initialize the model.

Error:

SimilaritySearchKit/NativeContextualEmbeddings.swift:43: Fatal error: 'try!' expression unexpectedly raised an error: Foundation._GenericObjCError.nilError

Usage:

await SimilarityIndex(
    model: NativeContextualEmbeddings(),
    metric: CosineSimilarity()
)

Device:
iPhone 13 Pro Max
iOS Version 17.2.1

[ZachNagengast]

I believe this is happening because nativeModel.requestAssets is not completed before trying to load the model. Tricky to catch because it only shows up if it is the very first install of the app. Thanks for the report!

[tiepvuvan]

I think we should let developers decide when to load the model(and documented it) like the way Apple did. They tell us to requireAssets before using the Contextual Model.