[https://nvbugs/5721907][fix] AutoDeploy: improve numerical stability of flashinfer attention test

[lucaslie]

Summary by CodeRabbit

• Tests
  • Enabled a previously skipped test for FlashInfer attention operations.
  • Updated KV cache initialization logic in context input testing to include prefill data when applicable.

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Description

Test Coverage

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[lucaslie]

/bot run

[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request removes a test skip annotation and adds KV cache initialization logic to a FlashInfer attention operator test. The changes enable a previously skipped test variant to run with proper prefilled KV cache setup before workspace initialization.

Changes

Cohort / File(s)	Summary
Test Skip Removal tests/integration/test_lists/waives.txt	Removed SKIP annotation for test_flashinfer_attention_op_context_input_pos[cuda-dtype0-4-8-seq6], enabling this test variant to run.
KV Cache Initialization tests/unittest/_torch/auto_deploy/unit/singlegpu/custom_ops/test_flashinfer_attention_op.py	Added prefilled KV cache initialization logic that fills k_cache and v_cache for the first PREFILL_SEQ_LEN tokens with random data before workspace initialization, conditioning on PREFILL_SEQ_LEN > 0.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Pre-merge checks and finishing touches

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	You can run @coderabbitai generate docstrings to improve docstring coverage.
Description check	⚠️ Warning	The pull request description contains only the template and GitHub bot help text with no actual content provided by the author.	Add a clear description of the issue, the solution, relevant test coverage, and confirm checklist items. The PR title mentions improving numerical stability but the body lacks explanation of what changed and why.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly indicates a fix to improve numerical stability of the flashinfer attention test, directly relating to the code changes.

✨ Finishing touches

• 📝 Generate docstrings

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[tensorrt-cicd]

PR_Github #30785 [ run ] triggered by Bot. Commit: c0d448b

[tensorrt-cicd]

PR_Github #30785 [ run ] completed with state SUCCESS. Commit: c0d448b
/LLM/main/L0_MergeRequest_PR pipeline #23767 completed with status: 'SUCCESS'