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198 lines
7.5 KiB
C++
198 lines
7.5 KiB
C++
/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: Hadrons/Modules/MSolver/MixedPrecisionRBPrecCG.hpp
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Copyright (C) 2015-2018
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Author: Antonin Portelli <antonin.portelli@me.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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See the full license in the file "LICENSE" in the top level distribution directory
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*************************************************************************************/
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/* END LEGAL */
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#ifndef Hadrons_MSolver_MixedPrecisionRBPrecCG_hpp_
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#define Hadrons_MSolver_MixedPrecisionRBPrecCG_hpp_
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#include <Hadrons/Global.hpp>
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#include <Hadrons/Module.hpp>
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#include <Hadrons/ModuleFactory.hpp>
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#include <Hadrons/Solver.hpp>
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#include <Hadrons/EigenPack.hpp>
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#include <Hadrons/Modules/MSolver/Guesser.hpp>
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BEGIN_HADRONS_NAMESPACE
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/******************************************************************************
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* Mixed precision schur red-black preconditioned CG *
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******************************************************************************/
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BEGIN_MODULE_NAMESPACE(MSolver)
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class MixedPrecisionRBPrecCGPar: Serializable
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{
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public:
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GRID_SERIALIZABLE_CLASS_MEMBERS(MixedPrecisionRBPrecCGPar,
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std::string , innerAction,
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std::string , outerAction,
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unsigned int, maxInnerIteration,
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unsigned int, maxOuterIteration,
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double , residual,
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std::string , eigenPack);
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};
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template <typename FImplInner, typename FImplOuter, int nBasis>
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class TMixedPrecisionRBPrecCG: public Module<MixedPrecisionRBPrecCGPar>
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{
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public:
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FERM_TYPE_ALIASES(FImplInner, Inner);
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FERM_TYPE_ALIASES(FImplOuter, Outer);
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SOLVER_TYPE_ALIASES(FImplOuter,);
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typedef HADRONS_DEFAULT_SCHUR_OP<FMatInner, FermionFieldInner> SchurFMatInner;
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typedef HADRONS_DEFAULT_SCHUR_OP<FMatOuter, FermionFieldOuter> SchurFMatOuter;
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private:
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template <typename Field>
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class OperatorFunctionWrapper: public OperatorFunction<Field>
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{
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public:
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OperatorFunctionWrapper(LinearFunction<Field> &fn): fn_(fn) {};
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virtual ~OperatorFunctionWrapper(void) = default;
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virtual void operator()(LinearOperatorBase<Field> &op,
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const Field &in, Field &out)
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{
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fn_(in, out);
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}
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private:
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LinearFunction<Field> &fn_;
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};
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public:
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// constructor
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TMixedPrecisionRBPrecCG(const std::string name);
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// destructor
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virtual ~TMixedPrecisionRBPrecCG(void) {};
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// dependency relation
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virtual std::vector<std::string> getInput(void);
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virtual std::vector<std::string> getReference(void);
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virtual std::vector<std::string> getOutput(void);
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// setup
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virtual void setup(void);
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// execution
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virtual void execute(void);
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};
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MODULE_REGISTER_TMP(MixedPrecisionRBPrecCG,
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ARG(TMixedPrecisionRBPrecCG<FIMPLF, FIMPLD, HADRONS_DEFAULT_LANCZOS_NBASIS>), MSolver);
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MODULE_REGISTER_TMP(ZMixedPrecisionRBPrecCG,
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ARG(TMixedPrecisionRBPrecCG<ZFIMPLF, ZFIMPLD, HADRONS_DEFAULT_LANCZOS_NBASIS>), MSolver);
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/******************************************************************************
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* TMixedPrecisionRBPrecCG implementation *
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******************************************************************************/
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// constructor /////////////////////////////////////////////////////////////////
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template <typename FImplInner, typename FImplOuter, int nBasis>
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TMixedPrecisionRBPrecCG<FImplInner, FImplOuter, nBasis>
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::TMixedPrecisionRBPrecCG(const std::string name)
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: Module<MixedPrecisionRBPrecCGPar>(name)
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{}
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// dependencies/products ///////////////////////////////////////////////////////
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template <typename FImplInner, typename FImplOuter, int nBasis>
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std::vector<std::string> TMixedPrecisionRBPrecCG<FImplInner, FImplOuter, nBasis>
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::getInput(void)
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{
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std::vector<std::string> in;
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return in;
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}
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template <typename FImplInner, typename FImplOuter, int nBasis>
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std::vector<std::string> TMixedPrecisionRBPrecCG<FImplInner, FImplOuter, nBasis>
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::getReference(void)
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{
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std::vector<std::string> ref = {par().innerAction, par().outerAction};
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if (!par().eigenPack.empty())
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{
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ref.push_back(par().eigenPack);
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}
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return ref;
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}
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template <typename FImplInner, typename FImplOuter, int nBasis>
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std::vector<std::string> TMixedPrecisionRBPrecCG<FImplInner, FImplOuter, nBasis>
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::getOutput(void)
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{
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std::vector<std::string> out = {getName(), getName() + "_subtract"};
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return out;
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}
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// setup ///////////////////////////////////////////////////////////////////////
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template <typename FImplInner, typename FImplOuter, int nBasis>
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void TMixedPrecisionRBPrecCG<FImplInner, FImplOuter, nBasis>
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::setup(void)
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{
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LOG(Message) << "Setting up Schur red-black preconditioned mixed-precision "
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<< "CG for inner/outer action '" << par().innerAction
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<< "'/'" << par().outerAction << "', residual "
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<< par().residual << ", and maximum inner/outer iteration "
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<< par().maxInnerIteration << "/" << par().maxOuterIteration
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<< std::endl;
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auto Ls = env().getObjectLs(par().innerAction);
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auto &imat = envGet(FMatInner, par().innerAction);
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auto &omat = envGet(FMatOuter, par().outerAction);
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auto guesserPt = makeGuesser<FImplOuter, nBasis>(par().eigenPack);
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auto makeSolver = [&imat, &omat, guesserPt, Ls, this](bool subGuess)
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{
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return [&imat, &omat, guesserPt, subGuess, Ls, this]
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(FermionFieldOuter &sol, const FermionFieldOuter &source)
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{
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typedef typename FermionFieldInner::vector_type VTypeInner;
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SchurFMatInner simat(imat);
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SchurFMatOuter somat(omat);
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MixedPrecisionConjugateGradient<FermionFieldOuter, FermionFieldInner>
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mpcg(par().residual, par().maxInnerIteration,
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par().maxOuterIteration,
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env().template getRbGrid<VTypeInner>(Ls),
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simat, somat);
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OperatorFunctionWrapper<FermionFieldOuter> wmpcg(mpcg);
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HADRONS_DEFAULT_SCHUR_SOLVE<FermionFieldOuter> schurSolver(wmpcg);
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schurSolver.subtractGuess(subGuess);
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schurSolver(omat, source, sol, *guesserPt);
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};
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};
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auto solver = makeSolver(false);
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envCreate(Solver, getName(), Ls, solver, omat);
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auto solver_subtract = makeSolver(true);
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envCreate(Solver, getName() + "_subtract", Ls, solver_subtract, omat);
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}
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// execution ///////////////////////////////////////////////////////////////////
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template <typename FImplInner, typename FImplOuter, int nBasis>
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void TMixedPrecisionRBPrecCG<FImplInner, FImplOuter, nBasis>
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::execute(void)
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{}
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END_MODULE_NAMESPACE
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END_HADRONS_NAMESPACE
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#endif // Hadrons_MSolver_MixedPrecisionRBPrecCG_hpp_
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