tflite_micro python package with signal ops

[ericheim]

BUG=#2357

Description

The proposed solution includes signal_ops to the tflite_micro python package. Adding signal_ops introduces a linker dependency to the specific tensorflow-cpu version the tflite_micro package was build against. E.G. when the python package was build against tensorflow-cpu==2.12.0, the version that is used in the requirements.txt, the signal ops will only be able to work when tensorflow=2.12.0 is installed on the system. Tested the build with up to version 2.15.0

Possible improvements

I added the tensorflow target version (2.12.0) to the requirements of the WHEEL and third_party/python_requirements.in. This should probably be done somewhere at a central place. Feedback is welcomed.

[ericheim]

Does the CI require a rebase instead of a merge?

[rascani]

Does the CI require a rebase instead of a merge?

No, merge is fine.

[rascani]

@ericheim - Just as an FYI, I'm interested in merging this, just working out the ramifications of pinning against a specific version of the tensorflow.

[ericheim]

Hi @rkuester , @rascani Thanks for your feedback!

@rascani The pinning of the tensorflow version can probably be done somehwere in a central place. @rkuester import paths in the example tflite-micro/tensorflow/lite/examples/micro_speech can also be changed after adopting the __init__.py.

[rascani]

The pinning of the tensorflow version can probably be done somehwere in a central place.

Understood, but we have to consider that not all users will be using the same tensorflow version. As I understand it, TF doesn't have any ABI stability guarantees between minor versions (and we're depending on C++ code), so this essentially requires all users to use 2.12. That might be okay, but we need to figure out what the policy should be for this version.

[ericheim]

Hi @rkuester , @rascani ,

I extended the tflite_micro.postinstall_check.passed() with the signal library. Unfortunately adapting the import paths in the __init__.py is a bigger change than expected. This is due to missing __init__.py inside of tflite_micro/python and tflite_micro/python/tflite_micro in the WHEEL file. Using it in dev mode doesn't has these problems.

Adding more code into the existing init files, e.g. directly adding the directories to sys.path interferes either with the tensorflow installation signal ops or breaks the tflite_micro in dev mode, when using it from the folder directly.

[rkuester]

Thanks for adding the test, @ericheim.

I'm working on the import name issue. You're right, adding a subpackage to the public API via the __init__.py trick doesn't work the same way that adding a module works.

[ericheim]

@rkuester Thanks for taking care of the import name issue!

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[ericheim]

Resolved merge conflict. The solution still has to be pinned against a specific tensorflow version.

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