RooFit::TestStatistics::LikelihoodSerial Class Reference

Serial likelihood calculation strategy implementation.

This class serves as a baseline reference implementation of the LikelihoodWrapper. It reimplements the previous RooNLLVar "BulkPartition" single CPU strategy in the new RooFit::TestStatistics framework.

Note

The class is not intended for use by end-users. We recommend to either use RooMinimizer with a RooAbsL derived likelihood object, or to use a higher level entry point like RooAbsPdf::fitTo() or RooAbsPdf::createNLL().

Definition at line 24 of file LikelihoodSerial.h.

Public Member Functions
	LikelihoodSerial (std::shared_ptr< RooAbsL > _likelihood, std::shared_ptr< WrapperCalculationCleanFlags > calculation_is_clean, SharedOffset offset)
void	evaluate () override
	Triggers (possibly asynchronous) evaluation of the likelihood.
ROOT::Math::KahanSum< double >	getResult () const override
	Return the latest result of a likelihood evaluation.
void	initVars ()
	Helper function for the constructor.
Public Member Functions inherited from RooFit::TestStatistics::LikelihoodWrapper
	LikelihoodWrapper (const LikelihoodWrapper &)=delete
virtual	~LikelihoodWrapper ()=default
void	constOptimizeTestStatistic (RooAbsArg::ConstOpCode opcode, bool doAlsoTrackingOpt)
double	defaultErrorLevel () const
virtual void	enableOffsetting (bool flag)
virtual std::string	GetName () const
virtual std::string	GetTitle () const
virtual bool	isOffsetting () const
LikelihoodWrapper &	operator= (const LikelihoodWrapper &)=delete
void	setApplyWeightSquared (bool flag)
void	setOffsettingMode (OffsettingMode mode)
virtual void	synchronizeParameterSettings (const std::vector< ROOT::Fit::ParameterSettings > &parameter_settings)
virtual void	synchronizeWithMinimizer (const ROOT::Math::MinimizerOptions &options)
	Synchronize minimizer settings with calculators in child classes.
virtual void	updateMinuitExternalParameterValues (const std::vector< double > &minuit_external_x)
virtual void	updateMinuitInternalParameterValues (const std::vector< double > &minuit_internal_x)
	Minuit passes in parameter values that may not conform to RooFit internal standards (like applying range clipping), but that the specific calculator does need.

Private Attributes
RooArgList	_saveVars
	Copy of variables.
RooArgList	_vars
	Variables.
ROOT::Math::KahanSum< double >	result

Additional Inherited Members
Static Public Member Functions inherited from RooFit::TestStatistics::LikelihoodWrapper
static std::unique_ptr< LikelihoodWrapper >	create (LikelihoodMode likelihoodMode, std::shared_ptr< RooAbsL > likelihood, std::shared_ptr< WrapperCalculationCleanFlags > calculationIsClean, SharedOffset offset)
	Factory method.
Protected Member Functions inherited from RooFit::TestStatistics::LikelihoodWrapper
	LikelihoodWrapper (std::shared_ptr< RooAbsL > likelihood, std::shared_ptr< WrapperCalculationCleanFlags > calculation_is_clean, SharedOffset offset)
void	calculate_offsets ()
	(Re)calculate (on each worker) all component offsets.
Protected Attributes inherited from RooFit::TestStatistics::LikelihoodWrapper
std::shared_ptr< WrapperCalculationCleanFlags >	calculation_is_clean_
bool	do_offset_ = false
std::shared_ptr< RooAbsL >	likelihood_
LikelihoodType	likelihood_type_
OffsettingMode	offsetting_mode_ = OffsettingMode::legacy
SharedOffset	shared_offset_

#include </home/sftnight/build/workspace/root-makedoc-master/rootspi/rdoc/src/master/roofit/roofitcore/src/TestStatistics/LikelihoodSerial.h>

Inheritance diagram for RooFit::TestStatistics::LikelihoodSerial:

Constructor & Destructor Documentation

LikelihoodSerial()

RooFit::TestStatistics::LikelihoodSerial::LikelihoodSerial	(	std::shared_ptr< RooAbsL >	_likelihood,
		std::shared_ptr< WrapperCalculationCleanFlags >	calculation_is_clean,
		SharedOffset	offset
	)

Definition at line 31 of file LikelihoodSerial.cxx.

Member Function Documentation

evaluate()

void RooFit::TestStatistics::LikelihoodSerial::evaluate ( )

overridevirtual

Triggers (possibly asynchronous) evaluation of the likelihood.

In parallel strategies, it may be advantageous to allow a calling process to continue on with other tasks while the calculation is offloaded to another process or device, like a GPU. For this reason, evaluate() does not return the result, this is done in getResult().

Implements RooFit::TestStatistics::LikelihoodWrapper.

Definition at line 62 of file LikelihoodSerial.cxx.

getResult()

ROOT::Math::KahanSum< double > RooFit::TestStatistics::LikelihoodSerial::getResult ( ) const

inlineoverridevirtual

Return the latest result of a likelihood evaluation.

Returns the result that was stored after calling evaluate(). It is up to the implementer to make sure the stored value represents the most recent evaluation call, e.g. by using a mutex.

Implements RooFit::TestStatistics::LikelihoodWrapper.

Definition at line 32 of file LikelihoodSerial.h.

initVars()

void RooFit::TestStatistics::LikelihoodSerial::initVars

(

)

Helper function for the constructor.

This is a separate function (instead of just in ctor) for historical reasons. Its predecessor RooRealMPFE::initVars() was used from multiple ctors, but also from RooRealMPFE::constOptimizeTestStatistic at the end, which makes sense, because it might change the set of variables. We may at some point want to do this here as well.

Definition at line 46 of file LikelihoodSerial.cxx.

Member Data Documentation

_saveVars

RooArgList RooFit::TestStatistics::LikelihoodSerial::_saveVars

private

Copy of variables.

Definition at line 38 of file LikelihoodSerial.h.

_vars

RooArgList RooFit::TestStatistics::LikelihoodSerial::_vars

private

Variables.

Definition at line 37 of file LikelihoodSerial.h.

result

ROOT::Math::KahanSum<double> RooFit::TestStatistics::LikelihoodSerial::result

private

Definition at line 35 of file LikelihoodSerial.h.