Newton.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/NonlinearSolver.h"
#include "neml2/misc/math.h"
 
namespace neml2
{
class Newton : public NonlinearSolver
{
public:
  static OptionSet expected_options();
 
  Newton(const OptionSet & options);
 
  virtual std::tuple<bool, size_t> solve(NonlinearSystem & system, Tensor & x) override;
 
protected:
  virtual void prepare(const NonlinearSystem & /*system*/, const Tensor & /*x*/) {}
 
  virtual bool converged(size_t itr, const torch::Tensor & nR, const torch::Tensor & nR0) const;
 
  virtual void update(NonlinearSystem & system, Tensor & x);
 
  virtual void final_update(NonlinearSystem & system, Tensor & x);
 
  virtual Tensor solve_direction(const NonlinearSystem & system);
};
} // namespace neml2