NewtonWithTrustRegion.h

// Copyright 2024, UChicago Argonne, LLC
// All Rights Reserved
// Software Name: NEML2 -- the New Engineering material Model Library, version 2
// By: Argonne National Laboratory
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#pragma once
 
#include "neml2/solvers/Newton.h"
#include "neml2/solvers/TrustRegionSubProblem.h"
 
namespace neml2
{
class NewtonWithTrustRegion : public Newton
{
public:
  static OptionSet expected_options();
 
  NewtonWithTrustRegion(const OptionSet & options);
 
protected:
  OptionSet subproblem_options(const OptionSet &) const;
 
  OptionSet subproblem_solver_options(const OptionSet &) const;
 
  void prepare(const NonlinearSystem & system, const NonlinearSystem::Sol<true> & x) override;
 
  void update(NonlinearSystem & system,
              NonlinearSystem::Sol<true> & x,
              const NonlinearSystem::Res<true> & r,
              const NonlinearSystem::Jac<true> & J) override;
 
  NonlinearSystem::Sol<true> solve_direction(const NonlinearSystem::Res<true> & r,
                                             const NonlinearSystem::Jac<true> & J) override;
 
  Scalar merit_function_reduction(const NonlinearSystem::Res<true> & r,
                                  const NonlinearSystem::Jac<true> & J,
                                  const NonlinearSystem::Sol<true> & p) const;
 
  TrustRegionSubProblem _subproblem;
 
  Newton _subproblem_solver;
 
  Scalar _delta;
 
  Real _delta_0;
 
  Real _delta_max;
 
  Real _reduce_criteria;
 
  Real _expand_criteria;
 
  Real _reduce_factor;
 
  Real _expand_factor;
 
  Real _accept_criteria;
};
} // namespace neml2