[https://nvbugs/6422299][fix] Setup dependency for Cosmos3 nano t2v LPIPS test

[yibinl-nvidia]

Description

Fix the Cosmos3-Nano T2V LPIPS test dependency wiring so the _visual_gen_deps fixture runs before the test writes an MP4 file.

The test uses _save_lpips_video_mp4(), which intentionally fails when ffmpeg is unavailable to avoid comparing codec artifacts against the golden video. Without this fixture, isolated or sharded runs can skip the ffmpeg install path and fail before LPIPS is evaluated.

Testing

• git diff --check
• python3 -m py_compile tests/integration/defs/examples/visual_gen/test_visual_gen.py

Summary by CodeRabbit

• Tests
  • Updated a visual generation integration test to use the shared VisualGen setup fixture.
  • Adjusted a waived test entry to match the current visual generation variant under test.

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📥 Commits

Reviewing files that changed from the base of the PR and between 5ce293f and f87578b.

📒 Files selected for processing (2)

• tests/integration/defs/examples/visual_gen/test_visual_gen.py
• tests/integration/test_lists/waives.txt

💤 Files with no reviewable changes (1)

• tests/integration/test_lists/waives.txt

---

📝 Walkthrough

Walkthrough

Adds the _visual_gen_deps fixture parameter to test_cosmos3_nano_t2v_lpips_against_golden and replaces the waived t2v entry with a t2i entry (different nvbugs link) for the same test pattern in waives.txt.

Changes

VisualGen Test Fixture and Waiver Update

Layer / File(s)	Summary
Test fixture and waiver update tests/integration/defs/examples/visual_gen/test_visual_gen.py, tests/integration/test_lists/waives.txt	Adds _visual_gen_deps fixture parameter to the golden LPIPS test and updates the waiver entry from the t2v to t2i variant with a different nvbugs link.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Possibly related PRs

• NVIDIA/TensorRT-LLM#15195: Also modifies the Cosmos3 VisualGen waiver entries in the same waives.txt list.

Suggested reviewers: dongxuy04, pcastonguay

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title uses a valid NVBugs ticket, fix type, and clearly summarizes the Cosmos3 Nano T2V LPIPS dependency fix.
Description check	✅ Passed	The description covers the issue, solution, and testing, but it omits the PR checklist section from the template.
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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