Fix bug in dglu xfilter math

[vasunvidia]

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Affected area

Summary

Why

Related issues

API and compatibility impact

Testing

Summary by CodeRabbit

• Bug Fixes
  • Corrected gradient handling for clipped activation values in grouped GEMM operations.
  • Gradients are now preserved only within the supported ranges for both vectorized and scalar execution paths, improving consistency and numerical correctness.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: 2ce42381-2bec-4b5a-bdaa-dbeae13173c7

📥 Commits

Reviewing files that changed from the base of the PR and between c622373 and a39a71e.

📒 Files selected for processing (1)

• python/cudnn/gemm/cutedsl/grouped/dglu/moe_blockscaled_grouped_gemm_dglu_rubin.py

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📝 Walkthrough

Walkthrough

The DGeGLU vectorized and scalar gradient paths now use binary clipping masks. x1 gradients are removed above 7. x2 gradients are preserved only within the inclusive range [-7, 7].

Changes

DGeGLU gradient filtering

Layer / File(s)	Summary
Apply clipping masks python/cudnn/gemm/cutedsl/grouped/dglu/moe_blockscaled_grouped_gemm_dglu_rubin.py	The vectorized and scalar paths now use binary validity masks instead of clipped activation values when filtering x1 and x2 gradients.

Estimated code review effort: 2 (Simple) | ~10 minutes

Mergeability Score: ⚪ Minimal · up to a39a7

This localized change adjusts the dglu xfilter math behavior without any identified merge-blocking risk; it is merge-ready after normal checks and review.

Suggested reviewers: anerudhan

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description contains only the template and omits the summary, rationale, affected area, compatibility impact, and testing details.	Complete the required sections with the affected area, change summary, rationale, compatibility impact, related issues, and exact testing results.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: fixing the dglu xfilter math bug.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[Anerudhan]

@cudnn-ci-bot run oss

[cudnn-ci-bot]

🚀 Running mirror pipeline

Branch: cudnn-gh/pr-568-a39a71e
Pipeline: 63045557
Targets: oss