`from executorch.exir import CaptureConfig` fails with ExecuTorch pip installed in editable mode

[swolchok]

🐛 Describe the bug

python -c 'from executorch.exir import CaptureConfig' works with ExecuTorch installed via ./install_executorch.sh, but fails with ExecuTorch installed by pip install -e .:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
    from executorch.exir import CaptureConfig
ImportError: cannot import name 'CaptureConfig' from 'executorch.exir' (unknown location)

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[JacobSzwejbka]

@larryliu0820 @GregoryComer have you guys worked on the pip build before?

[larryliu0820]

According to https://stackoverflow.com/questions/64838393/package-dir-in-setup-py-not-working-as-expected our current pattern cannot be supported in editable mode.

Basically our file structure stopped us from doing from executorch.exir import CaptureConfig because editable mode can't take __init__.py under exir/. Like you can do from executorch.backends import apple because there's no __init__.py under backends/.

I think this can't be fixed until we have an executorch/ like mentioned in #8699

[swolchok]

@larryliu0820 re: prioritization as backlog, note that this blocks building ExecuTorch through CMake with the pip installed in editable mode.

[larryliu0820]

@swolchok yeah to work around I think you can do from executorch.exir.capture import CaptureConfig