[RF] Don't normalize over non-dependents when compiling RooFormulaVar #20772
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The `depList` list is filled already with the subset of normalization variables that the pdf depends on (see `getObservables(nset, depList)` a few lines before. Therefore, the check `dependsOn(depList)` is redundant and causes unnecessary performance overheads, as the whole compute graph of the pdf has to be traversed. We might as well check if `depList` is empty for the same logic.
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This is done to fix clang-format failures in the CI.
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Don't normalize pdfs over non-dependents in `RooFormulaVar::compileForNormSet()`. This fixes use cases where pdfs that don't depend on any observables are used for their unnormalized `RooAbsPdf::evaluate()` shape as functions. Even thought technically not allowed because evaluating pdfs without a normalization set is undefined, this pattern is used a lot in the wild, so we need to support it also in the new vectorizing evaluation backend. A unit test that covers the original user-reported problem is also added.
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Test Results 22 files 22 suites 4d 1h 46m 48s ⏱️ For more details on these failures, see this check. Results for commit 8836cc5. ♻️ This comment has been updated with latest results. |
dpiparo
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Dec 24, 2025
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Don't normalize pdfs over non-dependents in
RooFormulaVar::compileForNormSet().This fixes use cases where pdfs that don't depend on any observables are used for their unnormalized
RooAbsPdf::evaluate()shape as functions.Even thought technically not allowed because evaluating pdfs without a normalization set is undefined, this pattern is used a lot in the wild, so we need to support it also in the new vectorizing evaluation backend.
A unit test that covers the original user-reported problem is also added.