Add global flag to set NLL evaluation backend #1018
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guitargeek
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* In case the value is `"combine"`, it will use combines caching NLL
classes
* In any other case, it will RooFits default `createNLL()`, setting
the RooFit::EvalBackend to the value on the global flag.
See: https://root.cern.ch/doc/master/classRooAbsPdf.html#a24b1afec4fd149e08967eac4285800de
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Example: # To use the evaluation backends of RooFit
ROOT.gInterpreter.Declare("#include <HiggsAnalysis/CombinedLimit/interface/Combine.h>")
# Do any of:
ROOT.Combine.nllBackend_ = "combine" # the combine caching NLL
ROOT.Combine.nllBackend_ = "cpu" # the default in RooFit
ROOT.Combine.nllBackend_ = "legacy" # the old backend of RooFit, very slow
ROOT.Combine.nllBackend_ = "codegen" # do the code generation to get analytic gradients |
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In case the value is
"combine", it will use combines caching NLL classesIn any other case, it will RooFits default
createNLL(), setting the RooFit::EvalBackend to the value on the global flag. See: https://root.cern.ch/doc/master/classRooAbsPdf.html#a24b1afec4fd149e08967eac4285800de