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116 lines
5.1 KiB
C++
116 lines
5.1 KiB
C++
/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: ./lib/qcd/action/pseudofermion/GeneralEvenOddRationalRatioMixedPrec.h
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Copyright (C) 2015
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Author: Christopher Kelly <ckelly@bnl.gov>
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Author: Peter Boyle <paboyle@ph.ed.ac.uk>
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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 QCD_PSEUDOFERMION_GENERAL_EVEN_ODD_RATIONAL_RATIO_MIXED_PREC_H
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#define QCD_PSEUDOFERMION_GENERAL_EVEN_ODD_RATIONAL_RATIO_MIXED_PREC_H
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#include <Grid/algorithms/iterative/ConjugateGradientMultiShiftCleanup.h>
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NAMESPACE_BEGIN(Grid);
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/////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// Generic rational approximation for ratios of operators utilizing the mixed precision multishift algorithm
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// cf. GeneralEvenOddRational.h for details
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/////////////////////////////////////////////////////////////////////////////////////////////////////////////
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template<class ImplD, class ImplF>
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class GeneralEvenOddRatioRationalMixedPrecPseudoFermionAction : public GeneralEvenOddRatioRationalPseudoFermionAction<ImplD> {
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private:
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typedef typename ImplD::FermionField FermionFieldD;
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typedef typename ImplF::FermionField FermionFieldF;
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FermionOperator<ImplD> & NumOpD;
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FermionOperator<ImplD> & DenOpD;
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FermionOperator<ImplF> & NumOpF;
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FermionOperator<ImplF> & DenOpF;
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Integer ReliableUpdateFreq;
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protected:
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//Action evaluation
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//Allow derived classes to override the multishift CG
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virtual void multiShiftInverse(bool numerator, const MultiShiftFunction &approx, const Integer MaxIter, const FermionFieldD &in, FermionFieldD &out){
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#if 1
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SchurDifferentiableOperator<ImplD> schurOp(numerator ? NumOpD : DenOpD);
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ConjugateGradientMultiShift<FermionFieldD> msCG(MaxIter, approx);
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msCG(schurOp,in, out);
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#else
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SchurDifferentiableOperator<ImplD> schurOpD(numerator ? NumOpD : DenOpD);
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SchurDifferentiableOperator<ImplF> schurOpF(numerator ? NumOpF : DenOpF);
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FermionFieldD inD(NumOpD.FermionRedBlackGrid());
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FermionFieldD outD(NumOpD.FermionRedBlackGrid());
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// Action better with higher precision?
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ConjugateGradientMultiShiftMixedPrec<FermionFieldD, FermionFieldF> msCG(MaxIter, approx, NumOpF.FermionRedBlackGrid(), schurOpF, ReliableUpdateFreq);
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msCG(schurOpD, in, out);
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#endif
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}
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//Force evaluation
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virtual void multiShiftInverse(bool numerator, const MultiShiftFunction &approx, const Integer MaxIter, const FermionFieldD &in, std::vector<FermionFieldD> &out_elems, FermionFieldD &out){
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SchurDifferentiableOperator<ImplD> schurOpD(numerator ? NumOpD : DenOpD);
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SchurDifferentiableOperator<ImplF> schurOpF(numerator ? NumOpF : DenOpF);
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FermionFieldD inD(NumOpD.FermionRedBlackGrid());
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FermionFieldD outD(NumOpD.FermionRedBlackGrid());
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std::vector<FermionFieldD> out_elemsD(out_elems.size(),NumOpD.FermionRedBlackGrid());
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ConjugateGradientMultiShiftMixedPrecCleanup<FermionFieldD, FermionFieldF> msCG(MaxIter, approx, NumOpF.FermionRedBlackGrid(), schurOpF, ReliableUpdateFreq);
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msCG(schurOpD, in, out_elems, out);
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}
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//Allow derived classes to override the gauge import
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virtual void ImportGauge(const typename ImplD::GaugeField &Ud){
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typename ImplF::GaugeField Uf(NumOpF.GaugeGrid());
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precisionChange(Uf, Ud);
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std::cout << "Importing "<<norm2(Ud)<<" "<< norm2(Uf)<<" " <<std::endl;
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NumOpD.ImportGauge(Ud);
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DenOpD.ImportGauge(Ud);
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NumOpF.ImportGauge(Uf);
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DenOpF.ImportGauge(Uf);
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}
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public:
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GeneralEvenOddRatioRationalMixedPrecPseudoFermionAction(FermionOperator<ImplD> &_NumOpD, FermionOperator<ImplD> &_DenOpD,
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FermionOperator<ImplF> &_NumOpF, FermionOperator<ImplF> &_DenOpF,
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const RationalActionParams & p, Integer _ReliableUpdateFreq
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) : GeneralEvenOddRatioRationalPseudoFermionAction<ImplD>(_NumOpD, _DenOpD, p),
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ReliableUpdateFreq(_ReliableUpdateFreq),
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NumOpD(_NumOpD), DenOpD(_DenOpD),
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NumOpF(_NumOpF), DenOpF(_DenOpF)
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{}
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virtual std::string action_name(){return "GeneralEvenOddRatioRationalMixedPrecPseudoFermionAction";}
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};
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NAMESPACE_END(Grid);
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#endif
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