IterativeIdentitiesHessianModifier.hpp

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// This file is part of GQCG-GQCP.
//
// Copyright (C) 2017-2020  the GQCG developers
//
// GQCG-GQCP is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// GQCG-GQCP is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with GQCG-GQCP.  If not, see <http://www.gnu.org/licenses/>.
 
#pragma once
 
 
#include "Mathematical/Optimization/Minimization/BaseHessianModifier.hpp"
 
 
namespace GQCP {
 
 
class IterativeIdentitiesHessianModifier: public BaseHessianModifier {
private:
    double alpha;  // the scaling factor used to obtain the next scaler tau
    double beta;   // the heuristic increment
    double tau;    // the scaling scalar (the 'scaler')
 
 
public:
    // CONSTRUCTORS
 
    IterativeIdentitiesHessianModifier(const double alpha = 2.0, const double beta = 1.0e-03);
 
 
    // PUBLIC OVERRIDDEN METHODS
 
    SquareMatrix<double> operator()(const SquareMatrix<double>& hessian) override;
};
 
 
}  // namespace GQCP