[https://nvbugs/6655359][test] Shrink the Cosmos3-Nano T2V LPIPS gate to 9 frames, relax T2V/V2V thresholds, and unwaive - #18550
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… to 9 frames, relax T2V/V2V thresholds, and unwaive The B300-cut goldens from NVIDIA#17780 fail deterministically on the B200 CI lane (t2v 0.1507, v2v 0.0749 vs 0.05): Cosmos3-Nano trajectories are not bit-stable across GPU steppings, and the divergence grows with trajectory length (0.020 / 0.075 / 0.151 at 1 / 9 / 189 frames, everything else held fixed). The 'bit-stable across B200/B300' provenance clause was an over-generalization from Edge-model measurements; corrected everywhere it appears. Per the VisualGen CI strategy these gates are severe-regression backstops, so: shrink the T2V KPI config from the 189-frame 720P default to 9 frames (2,760 video tokens vs 44,160; the test drops from ~9 min to ~71 s) with a fresh golden cut on the gating lane's own GPU; gate t2v at 0.20 and v2v at 0.15, both above the measured 9-frame cross-stepping floor (0.075) so a future CI GPU change does not force a re-cut, and both still firing on the historical genuine-regression class (0.45-0.61). Member-wise zip repack, 44 sibling members byte-identical. Both waives removed; a temporary pre-merge listing (marked REMOVE BEFORE MERGE) proves the gates on the B200 lane before merge. Validated on B200 (umb-b200-236, native, current main): t2v 0.000000, v2v 0.069536, 2 passed in 71 s. B300 cross-check of the retired 189-frame golden: bit-exact regeneration, 0.000000. Signed-off-by: Igor Shovkun <ishovkun@nvidia.com>
Requested in review. The gates' pre-merge evidence is the local run on the lane's GPU (B200, native, main @ 5fb6883): t2v 0.000000 < 0.20 against the lane-cut golden, v2v 0.069536 < 0.15, 2 passed in 71 s. The post_merge block in this file remains the tests' permanent home. Signed-off-by: Igor Shovkun <ishovkun@nvidia.com>
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Included review availability: Your plan provides up to 12 included reviews per hour; 11 remain after this review. WalkthroughCosmos3 LPIPS validation now documents GPU-stepping variability, uses dedicated T2I, T2V, and V2V thresholds, shortens Nano T2V generation to nine frames, and updates golden execution metadata. ChangesCosmos3 LPIPS validation
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: ⚪ Minimal · up to This updates Cosmos3 LPIPS baselines and thresholds for GPU-stepping variability while retaining the T2I gate. No merge-blocking risk is identified. Possibly related PRs
Suggested labels: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Description checkExplanation The description is complete and relevant. It explains the failure, root cause, fix, measured results, test coverage, and checklist status. It also documents the GPU-stepping behavior and threshold rationale.
✨ Finishing Touches🧪 Generate unit tests (beta)
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`@tests/integration/defs/examples/visual_gen/golden/visual_gen_lpips/cosmos3_edge_i2v_lpips_golden_video.json`:
- Line 29: Correct the Cosmos3 LPIPS provenance metadata in all five listed JSON
manifests: record the specific B200 score for each gate, or clearly label the
Nano 0.02–0.15 trajectory range as shared context, and align the Edge manifests’
golden-source metadata with the documented diffusers-main references instead of
self-golden claims. No test functions or media files require changes.
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tests/integration/defs/examples/visual_gen/golden/visual_gen_lpips/cosmos3_edge_i2v_lpips_golden_video.jsontests/integration/defs/examples/visual_gen/golden/visual_gen_lpips/cosmos3_edge_t2i_lpips_golden.jsontests/integration/defs/examples/visual_gen/golden/visual_gen_lpips/cosmos3_edge_t2v_lpips_golden_video.jsontests/integration/defs/examples/visual_gen/golden/visual_gen_lpips/cosmos3_nano_fp8_blockwise_lpips_golden.jsontests/integration/defs/examples/visual_gen/golden/visual_gen_lpips/cosmos3_nano_t2i_lpips_golden.jsontests/integration/defs/examples/visual_gen/golden/visual_gen_lpips/cosmos3_nano_t2v_lpips_golden_video.jsontests/integration/defs/examples/visual_gen/golden/visual_gen_lpips/cosmos3_nano_v2v_lpips_golden_frame.jsontests/integration/defs/examples/visual_gen/test_visual_gen_cosmos3.pytests/integration/defs/examples/visual_gen/visual_gen_test_utils.pytests/integration/test_lists/test-db/l0_b200.ymltests/integration/test_lists/waives.txt
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…ance; fix stale Edge golden-source comment Review feedback: the sibling manifests repeated the Cosmos3-Nano cross-stepping ladder without labeling it as sibling-model context and claimed an unspecified B200 pass. Record each gate's own B200 score where the CI record has one (nano_t2i 0.020043, edge_i2v 0.006800), label the Nano ladder as sibling-model data in the Edge records, and state the remaining gates' post-merge pass without inventing numbers. Also fix the stale test comment still describing the Edge goldens as diffusers-main references: they became TRT-LLM self-goldens at the fp32-pin re-baseline (the manifests were already correct); only i2v_4step remains a genuine diffusers reference. Signed-off-by: Igor Shovkun <ishovkun@nvidia.com>
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Review summary - CONCERNS
Verdict: Mechanically this is mergeable (mergeable: true, mergeable_state: blocked i.e. waiting on required checks/approvals) and it does clear the failure 6655359 reports, but it is a deliberate reduction in gate sensitivity — T2V shrinks 189 -> 9 frames and the bar moves 0.05 -> 0.20 — so it wants an explicit QA sign-off on what coverage is being traded away, not just a code approval.
Issues
- [MAJOR]
tests/integration/defs/examples/visual_gen/test_visual_gen_cosmos3.py:62- long-sequence T2V shape (189 frames / 44,160 tokens) dropped with no replacement visible in the diff - [MINOR]
tests/integration/defs/examples/visual_gen/test_visual_gen_cosmos3.py:82- ~4x sensitivity drop; threshold duplicated between Python constant and JSON manifest - [MINOR]
tests/integration/test_lists/test-db/l0_b200.yml:438- TIMEOUT 15 -> 10 removes headroom the warm-cache 71 s figure does not cover - [MINOR]
tests/integration/defs/examples/visual_gen/golden/visual_gen_lpips/cosmos3_nano_t2i_lpips_golden.json:27- t2i left at 0.05 with only ~2.5x margin over its own measured cross-stepping score - [MINOR]
tests/integration/defs/examples/visual_gen/test_visual_gen_cosmos3.py:751- edge goldens re-described as self-goldens; confirm the edge manifests agree - [NIT]
tests/integration/defs/examples/visual_gen/golden/visual_gen_lpips/cosmos3_nano_t2v_lpips_golden_video.json:22-measured_lpips_at_creationstill 0.0 on freshly re-cut media
QA view
- Test coverage: partial - this is a test-only PR so the two gates are exercised by construction, but the 189-frame / 720P T2V shape is no longer generated anywhere in the diff, and both unwaived gates are
post_merge-only inl0_b200.yml, so the recalibrated bands and the re-cut golden get their first CI execution after merge.cosmos3_nano_t2iandcosmos3_nano_fp8_blockwiseare documented as sitting on the same cross-stepping hazard but are neither re-cut nor re-banded. - SM coverage: the change is fundamentally about sm100 (B200) vs sm103 (B300) — that divergence is the root cause and is now recorded in the manifests and in
_lpips_pinned_fp32_matmul_precision. Only sm100 is gated. The re-cut T2V golden is now lane-pinned to sm100, which is correct today but means nothing in CI can re-validate the cross-stepping claim that justifies the 0.20 band. - Test code: threshold duplicated in two places (constant + manifest); nothing ties the manifest
num_framestoCOSMOS3_LPIPS_T2V_NUM_FRAMES, so a one-sided future edit would compare videos of different lengths; timeout tightened on a warm-cache measurement; manifest prose carries hand-maintained CI numbers and edge thresholds that no test checks; the new 9-frame latent-math comment duplicates the V2V comment right below it. - Test time: none - the only shape change reduces work (189 -> 9 frames at the same 35 steps; archive 30,674,088 -> 28,176,933 bytes), no new test ids or parametrisations, and the two unwaived entries were already budgeted in the post_merge list. Absolute wall-clock is not measurable from a diff.
- Needs
/qa-verify: yes - waives are being removed and the shared golden archive is re-packed. QA should confirm the non-T2V zip members are unchanged, that both gates pass on the real DGX_B200 lane with the new golden and bands, thatTIMEOUT (10)holds cold, and should explicitly sign off on the sensitivity trade.
Does this actually fix nvbugs/6655359?
Yes for the reported signature. NVBugs resolved the id (synopsis truncated at examples/visual_gen/test_visual_gen_cosmos3.py:..., disposition still "Open issue"), and the PR pins it to test_cosmos3_nano_t2v_lpips_against_golden at 0.150697 and test_cosmos3_nano_v2v_lpips_against_golden at 0.074898, both against 0.05. Tracing through the diff: T2V now asserts against COSMOS3_LPIPS_T2V_THRESHOLD = 0.20 (line 383) and its golden was re-cut at the new 9-frame shape on the gating lane (num_frames 9 in both the manifest and COSMOS3_LPIPS_T2V_NUM_FRAMES, new sha256, new zip oid, environment now B200/sm100), so that red is removed on two independent axes. V2V asserts against COSMOS3_LPIPS_V2V_THRESHOLD = 0.15 (line 403) versus the reported 0.0749, so it clears too. Both waives are dropped. The residual: V2V media is still B300-cut and judged on B200 with only ~2x margin, so the failure mode is absorbed rather than removed for that gate — a stepping change that moves the 9-frame floor upward re-opens it.
Possible new issues
- A mid-magnitude accuracy regression landing between the new floor (~0.075) and the new bars (0.20 / 0.15) on a 9-frame trajectory now passes silently; the comment's own justification only claims the 0.45-0.61 class of historical reds still fires.
- Long-sequence-only defects (temporal attention past 3 latent frames, VANILLA-backend tiling, allocator pressure at 720P/189 frames) produce no red anywhere in this suite after the shrink.
- The shared
visual_gen_lpips_golden_media.zipoid changed wholesale. The PR states all 44 sibling members are byte-identical by sha256; if any non-T2V member did shift, unrelated Cosmos3/Wan/GLM/Flux LPIPS gates reading the same archive move on the next post-merge build. - Because both tests are post_merge-only, any miscalibration (band or timeout) lands as a post-merge red on main rather than pre-merge.
What I could not verify
- Every measured number in this PR — 0.000000 / 0.069536 / 0.0749 / 0.020043 / 0.006800, the 2x2 B200-vs-B300 table, builds 2922-2924, host
umb-b200-236, commit5fb68830c9, the "44 sibling members byte-identical" claim. The diff records these as prose; none of them is machine-checked by a test. - Whether any test outside this diff still exercises the 189-frame 720P T2V shape, and whether the "component tests are the catch-net" claim is backed by an existing test id.
- The edge gates' actual thresholds (0.05 / 0.1 / 0.13 are quoted in the manifests but the constants are not in the diff) and the edge manifests' golden-source fields, which the rewritten comment at line 751 makes a claim about.
- CI state:
mergeable_state: blockedis reported here, but I cannot see which required check or approval is outstanding.
Automated review by NVCortex Lite, run by @crazydemo.
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Review summary - Approve (non-blocking)
Approving so this is not blocked on me. The points raised in my review comment above are non-blocking — please read them and address what you agree with before merging.
Worth doing before this is relied on: Two waives are removed and the golden media archive is re-packed, and both are things QA should confirm rather than take on assertion. Specifically: (1) confirm the re-packed visual_gen_lpips_golden_media.zip leaves all non-T2V members byte-identical, since every other Cosmos3/Wan/GLM/Flux LPIPS gate reads the same archive; (2) confirm the two unwaived gates pass on the actual DGX_B200 lane with the new 9-frame golden and the 0.20/0.15 bands, since these tests are post_merge-gated and get no pre-merge CI execution; (3) confirm the reduced TIMEOUT (10) holds on a cold lane; (4) get QA sign-off on the deliberate sensitivity reduction (189 -> 9 frames plus 0.05 -> 0.20) and on whether the 189-frame shape should be preserved in a lower-cadence list.
Automated review by NVCortex Lite, run by @crazydemo.
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PR_Github #71047 [ run ] triggered by Bot. Commit: |
…from the touched Cosmos3 goldens Review feedback: the field duplicated the Python constant with no reader, so the two could diverge silently and a reader could not tell which one the assertion honours. Nothing loads these manifests at runtime - every lpips_threshold in Python is a dataclass field fed from a module constant, the same pattern across the cosmos3, qwenimage, wan, glm and flux suites - so the JSON copy was dead data. Removed from the seven manifests this PR already touches; nvfp4 and i2v_4step keep theirs since this PR does not otherwise open them, and the same cleanup applies to the other models' manifests as a standalone change. Signed-off-by: Igor Shovkun <ishovkun@nvidia.com>
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PR_Github #71047 [ run ] completed with state
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Review feedback: the 71 s figure behind the tightening is a warm-cache local run on a dedicated B200 and does not cover checkpoint staging, _visual_gen_deps setup, LPIPS weight download, or a shared node. These gates are post_merge-only, so a too-tight budget would surface as a red on main with no pre-merge signal - the same class of non-model red this PR exists to remove. Keeping the existing budget costs nothing, since the generation cost is already down ~7 min; it can be tightened once post-merge builds have shown the real wall time. Signed-off-by: Igor Shovkun <ishovkun@nvidia.com>
…nd correct the regression figure Two fixes to the same sentences. The T2V rationale said self-distance was ~0, which is indistinguishable from a value carried over from the old media; it now records that the re-cut was re-measured on its own cutting host at 0.000000. The bars were also justified against 'historical reds 0.45-0.61'. The lower figure is nvbugs/6437341 at 0.449779, whose own record labels it a flaky test alternating pass/fail on unchanged main - a stale golden, not a regression, and evidence for relaxing rather than against it. Only nvbugs/6418815 at 0.608404 was a code-caused output change, bisected to a pipeline commit. The comment and both manifests now cite that single measured figure. Signed-off-by: Igor Shovkun <ishovkun@nvidia.com>
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PR_Github #71167 [ run ] completed with state |
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LGTM for infra part.
…OS3_LPIPS_T2I_THRESHOLD Review feedback: once T2V and V2V moved to their own constants, this one was left with a single user - the T2I gate - while its generic name still read like a shared default. Renamed to match its scope, so the three gates are named consistently, and documented why T2I keeps the tight 0.05 bar: the 1-frame shape has the smallest cross-stepping exposure in the family (0.020 measured on the B200 lane), so it needs no relaxed band. Value unchanged. Signed-off-by: Igor Shovkun <ishovkun@nvidia.com>
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PR_Github #71307 [ run ] triggered by Bot. Commit: |
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PR_Github #71307 [ run ] completed with state |
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Dev Engineer Review
0.05for T2I,0.20for T2V, and0.15for V2V.#58304.QA Engineer Review
Modified test code:
COSMOS3_LPIPS_T2V_NUM_FRAMESfrom189to9.COSMOS3_LPIPS_T2I_THRESHOLD.Modified test configuration:
tests/integration/test_lists/waives.txt.The modified LPIPS tests remain covered by the existing test-list configuration. B200 validation passed with T2V LPIPS
0.000000and V2V LPIPS0.069536.Verdict: sufficient
Description
Fixes nvbugs/6655359: post-merge builds 2922-2924 fail
test_cosmos3_nano_t2v_lpips_against_golden(0.150697 vs 0.05) andtest_cosmos3_nano_v2v_lpips_against_golden(0.074898 vs 0.05) on theDGX_B200 lane, deterministically — the same digits across three builds.
Root cause
The golden media was generated on a different GPU stepping than the one
that judges it, and Cosmos3-Nano's denoising trajectory is not bit-stable
across steppings. The goldens were cut on B300 (sm103); the CI gate runs on
B200 (sm100). Different steppings select different kernels, whose
floating-point reduction orders differ, and the 35-step denoising loop
amplifies that into a perceptible trajectory divergence that grows with
sequence length: LPIPS 0.020 / 0.075 / 0.151 at 1 / 9 / 189 frames, with
everything else held fixed. The old 0.05 threshold sits below that floor, so
the gate failed on GPU physics with no model change. The enabling defect was a
provenance claim of cross-stepping bit-stability that had never been measured
on this model.
Established by a complete 2×2 measurement (same commit, same torch
2.12.0+cu130, same diffusers 0.39.0, sha256-verified golden bytes, native
builds on both sides):
For scale, the other candidate axes measure: container-vs-native torch stack
~1e-4..5e-3, 250 commits of code drift ~4e-5 — both negligible against 0.15.
Fix
Full-step LPIPS gates are severe-regression backstops; component tests are
the catch-net for subtle drift. Accordingly:
(3 latent frames, 2,760 video tokens vs 44,160). The default costs ~7 min of
generation per CI run and adds no gate value; the T2V+V2V pair drops from
~9.5 min to 71 s. Test-list timeouts are unchanged (the t2v entry
was briefly tightened to 10 min and restored to 15 at review request).
current main). Member-wise zip repack — all 44 sibling members verified
byte-identical by sha256.
COSMOS3_LPIPS_T2V_THRESHOLD = 0.20,COSMOS3_LPIPS_V2V_THRESHOLD = 0.15:both sit ≥2× above the measured 9-frame cross-stepping floor (0.075), so a
future CI GPU change does not force a re-cut, and well below the one
code-caused regression these gates have caught: 0.608404 (nvbugs/6418815,
bisected to a pipeline change). The other historical red, 0.449779
(nvbugs/6437341), was a stale golden failing on unchanged main — evidence
for relaxing, not a regression the gate caught.
rationale on the gated records; the unmeasured cross-stepping portability
claim replaced with per-gate measured facts on all seven Cosmos3 records
carrying it. The unread
lpips_thresholdfield is dropped from thoseseven manifests: nothing loads it, and it duplicated the Python constant
the assertion actually honours.
_lpips_pinned_fp32_matmul_precisiondocstring scoped to what was measured(torch stacks), with an explicit statement that it does not cover GPU
steppings.
Pre-merge evidence
CI on the final head
715ae6b0: L0 #58304 SUCCESS — x86_64-Single-GPU6023 passed / 0 failed / 63 skipped, SBSA-Single-GPU 6012 / 0 / 59. Among
other things this exercises every other LPIPS gate that reads the repacked
shared archive.
Local validation on the lane's GPU (B200, native, main @ 5fb6883):
t2v 0.000000 < 0.20 against the lane-cut golden, v2v 0.069536 < 0.15 —
2 passed in 71 s. A temporary pre-merge listing was included to demonstrate
the gates on the CI lane and removed at reviewer request (641384f); these
tests are post_merge-gated, so their first CI execution is the first
post-merge build after merge. B300 cross-check: the retired 189-frame golden
regenerates bit-exactly (0.000000), confirming the root cause is the stepping,
not the media.
Supersedes #18243 (re-cut on B200 at the old tight threshold): a lane-pinned
golden alone re-breaks on the next CI GPU change; the relaxed band is what
retires that failure mode.
Test Coverage
examples/visual_gen/test_visual_gen_cosmos3.py::test_cosmos3_nano_t2v_lpips_against_goldenexamples/visual_gen/test_visual_gen_cosmos3.py::test_cosmos3_nano_v2v_lpips_against_goldenl0_b200.yml, so CI exercises them on the first post-merge build.PR Checklist
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