LaggedRegForm.hpp

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#pragma once
 
#include "Form.hpp"
 
#include <polyfem/utils/Types.hpp>
 
namespace polyfem::solver
{
    class LaggedRegForm : public Form
    {
    public:
        LaggedRegForm(const int n_lagging_iters);
 
        std::string name() const override { return "lagged-regularization"; }
 
    protected:
        double value_unweighted(const Eigen::VectorXd &x) const override;
 
        void first_derivative_unweighted(const Eigen::VectorXd &x, Eigen::VectorXd &gradv) const override;
 
        void second_derivative_unweighted(const Eigen::VectorXd &x, StiffnessMatrix &hessian) const override;
 
    public:
        void init_lagging(const Eigen::VectorXd &x) override;
 
        void update_lagging(const Eigen::VectorXd &x, const int iter_num) override;
 
        bool uses_lagging() const override { return true; }
 
    private:
        int n_lagging_iters_;      
        Eigen::VectorXd x_lagged_; 
    };
} // namespace polyfem::solver