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[RF] Bring vectorizing EvalBackends to createChi2 / chi2FitTo#22036

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[RF] Bring vectorizing EvalBackends to createChi2 / chi2FitTo#22036
guitargeek wants to merge 1 commit intoroot-project:masterfrom
guitargeek:chi2_cpu

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The createChi2() / chi2FitTo() so far always went through the legacy RooChi2Var. This commit wires them up to the same evaluation pipeline that createNLL() uses, so all of Cpu, Cuda, Codegen and CodegenNoGrad backend now work for chi-squared fits.

@guitargeek guitargeek self-assigned this Apr 23, 2026
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github-actions Bot commented Apr 24, 2026

Test Results

    22 files      22 suites   3d 9h 39m 4s ⏱️
 3 847 tests  3 846 ✅  1 💤 0 ❌
76 868 runs  76 850 ✅ 18 💤 0 ❌

Results for commit 6c46d4c.

♻️ This comment has been updated with latest results.

The `createChi2()` / `chi2FitTo()` so far always went through the legacy
`RooChi2Var`. This commit wires them up to the same evaluation pipeline
that `createNLL()` uses, so all of Cpu, Cuda, Codegen and CodegenNoGrad
backend now work for chi-squared fits.
@guitargeek guitargeek marked this pull request as ready for review April 24, 2026 14:30
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