The ingested VariationalRegistration module's CLI-driven registration tests compare produced output against baselines inherited from the archived ITKVariationalRegistration remote module. Those baselines do not match ITK-proper's output and their original source is unrecoverable (the module's ExternalData URLs are dead; Curvature3D is already disabled for the same reason). 13 tests are therefore disabled pending a cross-platform baseline review.
Investigation summary (built & reproduced locally, macOS, ITK PR #6276 branch)
- Deterministic: each test yields an identical ImageError on every run (e.g. SSD2D=2973, Gaussian3D=23657 across 3 runs) — no threading race.
- Environment matches CI:
ITK_USE_FFTWD=OFF/ITK_USE_FFTWF=OFF (ITK default Pixi); FFTW-dependent elastic/curvature tests are already gated out, so FFTW is not the cause.
- Not a crash / wrong algorithm: stable accumulated numerical divergence vs the inherited baselines; 3D (94×70×56, 3 levels) diverges more than 2D.
- Cross-platform hazard: these are floating-point registration outputs — deterministic per platform but not bit-identical across macOS-clang / Linux-gcc / Windows-MSVC. Regenerating baselines from one platform would move the failure to the other CI lanes (the
pr-fixture-and-expected-values anti-pattern). Plain comparison tolerance is infeasible (max pixel Δ 7→149, many differing pixels).
| Test |
ImageError |
Max pixel Δ |
| Diffusive2D |
140 |
9 |
| SymmetricDemons2D |
161 |
8 |
| SymDiff2D |
253 |
7 |
| PassiveDemons2D |
306 |
17 |
| NCC2D |
338 |
25 |
| SSD3D |
722 |
28 |
| Gaussian2D |
2729 |
50 |
| SSD2D |
2973 |
37 |
| SymDiff3D |
4962 |
36 |
| Diffeomorph3D |
13950 |
122 |
| Diffusive3D |
14137 |
140 |
| Gaussian3D |
23657 |
149 |
| NCC3D |
35693 |
136 |
(Diffeomorph2D passes and remains enabled. A separate harness bug — a bare trailing -O — was fixed in PR #6276 commit 49b8b83.)
Resolution options for the reviewer
- Regenerate baselines from a verified build and validate them across all CI lanes (Linux/Windows/macOS) before publishing to ITKTestingData.
- Per-test intensity + pixel-count tolerances sized from cross-platform deltas (only viable for the small-delta subset).
- Keep disabled if the upstream algorithm is not intended to be baseline-locked under ITK-proper.
The ingested
VariationalRegistrationmodule's CLI-driven registration tests compare produced output against baselines inherited from the archivedITKVariationalRegistrationremote module. Those baselines do not match ITK-proper's output and their original source is unrecoverable (the module's ExternalData URLs are dead;Curvature3Dis already disabled for the same reason). 13 tests are therefore disabled pending a cross-platform baseline review.Investigation summary (built & reproduced locally, macOS, ITK PR #6276 branch)
ITK_USE_FFTWD=OFF/ITK_USE_FFTWF=OFF(ITK default Pixi); FFTW-dependent elastic/curvature tests are already gated out, so FFTW is not the cause.pr-fixture-and-expected-valuesanti-pattern). Plain comparison tolerance is infeasible (max pixel Δ 7→149, many differing pixels).(
Diffeomorph2Dpasses and remains enabled. A separate harness bug — a bare trailing-O— was fixed in PR #6276 commit 49b8b83.)Resolution options for the reviewer