Install ET nightly and bump up ET version to 20241101

[larryliu0820]

Summary:

Change the way we install ExecuTorch python library. We read et-pin.txt and get back a string looks like 2024-11-01. Then we process it and download nightly version 0.5.0.dev20241101. We also infer the commit hash from this nightly version and use it to pull ET sources.

Test Plan: Rely on CI jobs.

Reviewers:

Subscribers:

Tasks:

Tags:

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/torchchat/1312

• 📄 Preview Python docs built from this PR

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❌ 2 New Failures

As of commit f6a3033 with merge base 74584d9 ():

NEW FAILURES - The following jobs have failed:

• pull / test-cpu-aoti (aarch64, stories15M) (gh)
  .ci/scripts/check_gibberish: line 31: aspell: command not found
• pull / test-cpu-aoti (x86_64, stories15M) (gh)
  .ci/scripts/validate.sh: line 130: 2855 Segmentation fault (core dumped) python3 -W ignore torchchat.py generate --dtype ${DTYPE} --checkpoint-path "$CHECKPOINT_PATH" --temperature 0 --aoti-package-path ${MODEL_DIR}/${MODEL_NAME}.pt2 --device "$TARGET_DEVICE" > "$MODEL_DIR/output_aoti"

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[larryliu0820]

Waiting for a new ET nightly