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November 12, 2026 21:36
Signed-off-by: Kaustubh Tangsali <ktangsali@nvidia.com>
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Show how CFD workflows can reduce ensemble members while retaining spatial partitions, then feed final summaries into existing metrics. The executable example checks GP total variance, a pressure-force observable, unequal member counts, uneven spatial partitions, an empty final contribution, and isolation between independent cases.
Validation: all three CPU/Gloo layouts passed on PyTorch 2.15 (two ranks with member-only or domain-only parallelism, and four ranks combining both). Pre-commit passed. GPU validation: all three layouts also passed with NCCL on H200, including the four-GPU 2-member-group × 2-domain-partition case (NRT job 844008, commit 8c4f385). The full CFD suite passed all 197 tests. Integrated GP uncertainty still requires joint samples or cross-point covariance.
Second of two stacked PRs; targets codex/cfd-uq-01-statistics so the diff contains only the example, its documentation, and CI execution.
Before merging (after #52 merges):
main."codex/cfd-uq-*"and its explanatory comments from.github/workflows/ci-tests.yml, restoringbranches: [main, master]. Keep the filter while this PR still targets CFD UQ Integration [1/2]: Add shared streaming statistics backend #52's branch so CI continues to run.mainafter the cleanup, including the distributed layouts.