ROL_DouglasRachfordProjection.hpp

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// @HEADER
// *****************************************************************************
//               Rapid Optimization Library (ROL) Package
//
// Copyright 2014 NTESS and the ROL contributors.
// SPDX-License-Identifier: BSD-3-Clause
// *****************************************************************************
// @HEADER
 
#ifndef ROL_DOUGLASRACHFORDPROJECTION_H
#define ROL_DOUGLASRACHFORDPROJECTION_H
 
#include "ROL_PolyhedralProjection.hpp"
#include "ROL_ParameterList.hpp"
 
namespace ROL {
 
template<typename Real>
class DouglasRachfordProjection : public PolyhedralProjection<Real> {
private:
  int dim_;
  Ptr<Vector<Real>> tmp_, p_, q_, y_, z_;
  Real b_, cdot_;
 
  Real DEFAULT_atol_, DEFAULT_rtol_;
  int DEFAULT_maxit_, DEFAULT_verbosity_;
  Real DEFAULT_alpha1_, DEFAULT_gamma_, DEFAULT_t0_;
 
  Real atol_, rtol_;
  int maxit_, verbosity_;
  Real alpha1_, alpha2_, gamma_, t0_;
 
  using PolyhedralProjection<Real>::bnd_;
  using PolyhedralProjection<Real>::con_;
  using PolyhedralProjection<Real>::xprim_;
  using PolyhedralProjection<Real>::xdual_;
  using PolyhedralProjection<Real>::mul_;
  using PolyhedralProjection<Real>::res_;
 
public:
 
  DouglasRachfordProjection(const Vector<Real>               &xprim,
                    const Vector<Real>               &xdual,
                    const Ptr<BoundConstraint<Real>> &bnd,
                    const Ptr<Constraint<Real>>      &con,
                    const Vector<Real>               &mul,
                    const Vector<Real>               &res);
 
  DouglasRachfordProjection(const Vector<Real>               &xprim,
                    const Vector<Real>               &xdual,
                    const Ptr<BoundConstraint<Real>> &bnd,
                    const Ptr<Constraint<Real>>      &con,
                    const Vector<Real>               &mul,
                    const Vector<Real>               &res,
                    ParameterList                    &list);
 
  void project(Vector<Real> &x, std::ostream &stream = std::cout) override;
 
private:
 
  Real residual_1d(const Vector<Real> &x) const;
 
  void residual_nd(Vector<Real> &r, const Vector<Real> &y) const;
 
  void project_bnd(Vector<Real> &x, const Vector<Real> &y) const;
 
  void project_con(Vector<Real> &x, const Vector<Real> &y) const;
 
  void project_DouglasRachford(Vector<Real> &x, std::ostream &stream = std::cout) const;
 
}; // class DouglasRachfordProjection
 
} // namespace ROL
 
#include "ROL_DouglasRachfordProjection_Def.hpp"
 
#endif