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
// OPEN SOURCE LICENSE (MIT)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
 
#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;
 
  virtual void prepare(const NonlinearSystem & system, const Tensor & x) override;
 
  virtual void update(NonlinearSystem & system, Tensor & x) override;
 
  virtual Tensor solve_direction(const NonlinearSystem & system) override;
 
  Scalar merit_function_reduction(const NonlinearSystem & system, const Tensor & 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