RooMinimizerFcn.h

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/// \cond ROOFIT_INTERNAL
 
/*****************************************************************************
 * Project: RooFit                                                           *
 * Package: RooFitCore                                                       *
 * @(#)root/roofitcore:$Id$
 * Authors:                                                                  *
 *   AL, Alfio Lazzaro,   INFN Milan,        alfio.lazzaro@mi.infn.it        *
 *   PB, Patrick Bos, Netherlands eScience Center, p.bos@esciencecenter.nl   *
 *                                                                           *
 *                                                                           *
 * Redistribution and use in source and binary forms,                        *
 * with or without modification, are permitted according to the terms        *
 * listed in LICENSE (http://roofit.sourceforge.net/license.txt)             *
 *****************************************************************************/
 
#ifndef ROO_MINIMIZER_FCN
#define ROO_MINIMIZER_FCN
 
#include "Math/IFunction.h"
 
#include "RooAbsReal.h"
#include "RooArgList.h"
 
#include <fstream>
#include <mutex>
#include <vector>
 
#include "RooAbsMinimizerFcn.h"
 
// forward declaration
class RooMinimizer;
 
class RooMinimizerFcn : public RooAbsMinimizerFcn {
 
public:
   RooMinimizerFcn(RooAbsReal *funct, RooMinimizer *context);
 
   void initMinimizer(ROOT::Math::Minimizer &, RooMinimizer *context) override;
 
   std::string getFunctionName() const override;
   std::string getFunctionTitle() const override;
 
   void setOffsetting(bool flag) override;
 
   double operator()(const double *x) const;
   void evaluateGradient(const double *x, double *out) const;
   bool evaluateHessian(std::span<const double> x, double *out) const;
 
   RooArgSet freezeDisconnectedParameters() const override;
 
   bool secondDerivativeAlwaysVanishes(unsigned int i, unsigned int j) const;
 
private:
   void buildSecondDerivMask() const;
 
   RooAbsReal *_funct = nullptr;
   std::unique_ptr<ROOT::Math::IBaseFunctionMultiDim> _multiGenFcn;
   mutable std::vector<double> _gradientOutput;
   mutable std::vector<double> _hessianOutput;
   mutable std::vector<bool> _secondDerivMask; ///< Lazily built, see buildSecondDerivMask().
   mutable std::once_flag _secondDerivMaskOnce;
};
 
#endif
 
/// \endcond