TrustRegionSubProblem.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/NonlinearSystem.h"
#include "neml2/tensors/Scalar.h"
 
namespace neml2
{
class TrustRegionSubProblem : public NonlinearSystem
{
public:
  TrustRegionSubProblem(const OptionSet & options);
 
  void reinit(const Res<true> & r, const Jac<true> & J, const Scalar & delta);
 
  Tensor preconditioned_direction(const Scalar & s) const;
 
protected:
  void set_guess(const Sol<false> & x) override;
 
  void assemble(Res<false> * residual, Jac<false> * Jacobian) override;
 
  Tensor preconditioned_solve(const Scalar & s, const Tensor & v) const;
 
private:
  Scalar _s;
 
  Scalar _delta;
 
  Tensor _JJ;
 
  Tensor _Jr;
};
} // namespace neml2