Qualcomm AI Engine Direct - HF LLM lm_eval lazy import

[winskuo-quic]

Summary

When importing HF LLM lowering flow from QNN, Optimum-ExecuTorch will run into lm_eval import error. To resolve this issue, we need to make lm_eval lazily imported, meaning we only import when we actually use the library.

Test plan

NA

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/20413

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❌ 1 New Failure, 35 Pending

As of commit 0a47ed8 with merge base 05b977d ():

NEW FAILURE - The following job has failed:

• pull / unittest-editable / macos / macos-job (gh)
  export/tests/test_target_recipes.py::TestTargetRecipes::test_resnet18_model

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