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muSpectre/src/solver/solver_base.hh
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/**
* @file solver_base.hh
*
* @author Till Junge <till.junge@epfl.ch>
*
* @date 18 Dec 2017
*
* @brief Base class for solvers
*
* Copyright © 2017 Till Junge
*
* µSpectre is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3, or (at
* your option) any later version.
*
* µSpectre is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Emacs; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef SOLVER_BASE_H
#define SOLVER_BASE_H
#include "solver/solver_error.hh"
#include "common/common.hh"
#include "system/system_base.hh"
#include "common/tensor_algebra.hh"
#include <Eigen/Dense>
#include <vector>
namespace muSpectre {
/* ---------------------------------------------------------------------- */
/**
* Virtual base class for solvers. Any implementation of this interface can be used with the solver functions prototyped in solvers.hh
*/
template <Dim_t DimS, Dim_t DimM=DimS>
class SolverBase
{
public:
/**
* Enum to describe in what kind the solver relies tangent stiffnesses
*/
enum class TangentRequirement{NoNeed, NeedEffect, NeedTangents};
using Sys_t = SystemBase<DimS, DimM>; //!< Cell type
using Ccoord = Ccoord_t<DimS>; //!< cell coordinates type
//! Field collection to store temporary fields in
using Collection_t = GlobalFieldCollection<DimS, DimM>;
//! Input vector for solvers
using SolvVectorIn = Eigen::Ref<Eigen::VectorXd>;
//! Input vector for solvers
using SolvVectorInC = Eigen::Ref<const Eigen::VectorXd>;
//! Output vector for solvers
using SolvVectorOut = Eigen::VectorXd;
//! Default constructor
SolverBase() = delete;
//! Constructor with domain resolutions
SolverBase(Sys_t & sys, Real tol, Uint maxiter=0, bool verbose =false);
//! Copy constructor
SolverBase(const SolverBase &other) = delete;
//! Move constructor
SolverBase(SolverBase &&other) = default;
//! Destructor
virtual ~SolverBase() = default;
//! Copy assignment operator
SolverBase& operator=(const SolverBase &other) = delete;
//! Move assignment operator
SolverBase& operator=(SolverBase &&other) = default;
//! Allocate fields used during the solution
virtual void initialise() {this->collection.initialise(this->sys.get_resolutions());}
//! determine whether this solver requires full tangent stiffnesses
bool need_tangents() const {
return (this->get_tangent_req() == TangentRequirement::NeedTangents);}
//! determine whether this solver requires evaluation of directional tangent
bool need_effect() const {
return (this->get_tangent_req() == TangentRequirement::NeedEffect);}
//! determine whether this solver has no need for tangents
bool no_need_tangent() const {
return (this->get_tangent_req() == TangentRequirement::NoNeed);}
//! returns whether the solver has converged
virtual bool has_converged() const = 0;
//! reset the iteration counter to zero
void reset_counter();
//! get the count of how many solve steps have been executed since
//! construction of most recent counter reset
Uint get_counter() const;
//! executes the solver
virtual SolvVectorOut solve(const SolvVectorInC rhs, SolvVectorIn x_0) = 0;
//! return a reference to the cell
Sys_t & get_system() {return sys;}
//! read the current maximum number of iterations setting
Uint get_maxiter() const {return this->maxiter;}
//! set the maximum number of iterations
void set_maxiter(Uint val) {this->maxiter = val;}
//! read the current tolerance setting
Real get_tol() const {return this->tol;}
//! set the torelance setting
void set_tol(Real val) {this->tol = val;}
//! returns the name of the solver
virtual std::string name() const = 0;
protected:
//! returns the tangent requirements of this solver
virtual TangentRequirement get_tangent_req() const = 0;
Sys_t & sys; //!< reference to the cell
Real tol; //!< convergence tolerance
Uint maxiter;//!< maximum number of iterations
bool verbose;//!< whether or not to write information to the std output
Uint counter{0}; //!< iteration counter
//! storage for internal fields to avoid reallocations between calls
Collection_t collection{};
private:
};
} // muSpectre
#endif /* SOLVER_BASE_H */
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