Mhp23 patch 1

[Mhp23]

• Excluded arm64 simulators from the pod
• Updating docs to run app on iOS simulators

Since the current stable version of TensorFlow Lite doesn't support arm64 simulators, building the app is failing for Apple Silicon (It appears that this issue is resolved in the TensorFlow Lite nightly version). Therefore, in this PR, the arm64 simulator is excluded, and instructions for running the app directly on x86_64 architecture simulators from the command line are added to the documentation.

[mrousavy]

Hey - thanks for your PR!

It appears that this issue is resolved in the TensorFlow Lite nightly version

I am building TensorFlow Lite from source from their current main - so if they fixed the issue, it should be resolved.
I did manage to run the example app on a simulator before, are you seeing errors or what was the motivation of this PR?

[Mhp23]

@mrousavy You're welcome!
Running the app on a physical device is OK, but when I've trying to run the app on a simulator with arm64 architecture, it threw the following errors and for run the app, I had to use Rosetta, and I decided to submit this PR that might be helpful for running the app on simulator with x86_64 architecture on Apple silicon chips. (Additionally, because TF doesn't support arm64 yet I excluded that)

Building for iOS Simulator, but linking in object file built for iOS, file '*/node_modules/react-native-fast-tflite/ios/TensorFlowLiteC.framework/TensorFlowLiteC' for architecture arm64

Linker command failed with exit code 1 (use -v to see invocation)

[mrousavy]

Ah I see - I think this approach is not really good since it blocks simulators / makes it harder to use on simulators.

I think we can compile TensorFlowLiteC for simulator as well (see build-tensorflow-ios.sh), I don't have any time to look into this right now though.
I'll leave this open for now for reference in the future.

[mrousavy]

See #26

[Chasty]

Same issue here, why it blocks simulators, I think it'd run in simulator as @Mhp23 mentioned.

[computerjazz]

I found this tensorflow PR from 2022 that was supposed to enable tflite to build for arm64 simulators: tensorflow/tensorflow#55777

Is it possible we just need to add --config=ios_sim_arm64 to the build script as indicated in that PR?

[mrousavy]

Hi - thanks for the PR - we recently migrated the library to Nitro and upgraded it to latest LiteRT, so I think this PR is quite out of sync now - sorry for not getting it merged sooner.

I'm going to close this for now, but if this is still relevant in the latest version, we can open another PR and get it merged. 👍