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305 lines
11 KiB
C++
305 lines
11 KiB
C++
/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: ./tests/Test_general_coarse_hdcg.cc
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Copyright (C) 2023
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Author: Peter Boyle <pboyle@bnl.gov>
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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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#include <Grid/Grid.h>
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#include <Grid/algorithms/iterative/ImplicitlyRestartedBlockLanczos.h>
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#include <Grid/algorithms/iterative/ImplicitlyRestartedBlockLanczosCoarse.h>
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#include <Grid/algorithms/iterative/AdefMrhs.h>
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using namespace std;
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using namespace Grid;
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// Want Op in CoarsenOp to call MatPcDagMatPc
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template<class Field>
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class HermOpAdaptor : public LinearOperatorBase<Field>
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{
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LinearOperatorBase<Field> & wrapped;
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public:
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HermOpAdaptor(LinearOperatorBase<Field> &wrapme) : wrapped(wrapme) {};
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void Op (const Field &in, Field &out) { wrapped.HermOp(in,out); }
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void HermOp(const Field &in, Field &out) { wrapped.HermOp(in,out); }
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void AdjOp (const Field &in, Field &out){ wrapped.HermOp(in,out); }
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void OpDiag (const Field &in, Field &out) { assert(0); }
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void OpDir (const Field &in, Field &out,int dir,int disp) { assert(0); }
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void OpDirAll (const Field &in, std::vector<Field> &out) { assert(0); };
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void HermOpAndNorm(const Field &in, Field &out,RealD &n1,RealD &n2){ assert(0); }
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};
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template<class Field> class CGSmoother : public LinearFunction<Field>
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{
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public:
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using LinearFunction<Field>::operator();
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typedef LinearOperatorBase<Field> FineOperator;
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FineOperator & _SmootherOperator;
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int iters;
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CGSmoother(int _iters, FineOperator &SmootherOperator) :
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_SmootherOperator(SmootherOperator),
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iters(_iters)
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{
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std::cout << GridLogMessage<<" Mirs smoother order "<<iters<<std::endl;
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};
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void operator() (const Field &in, Field &out)
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{
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ConjugateGradient<Field> CG(0.0,iters,false); // non-converge is just fine in a smoother
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out=Zero();
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CG(_SmootherOperator,in,out);
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}
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};
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int main (int argc, char ** argv)
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{
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Grid_init(&argc,&argv);
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const int Ls=24;
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const int nbasis = 60;
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const int cb = 0 ;
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RealD mass=0.00078;
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RealD M5=1.8;
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RealD b=1.5;
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RealD c=0.5;
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GridCartesian * UGrid = SpaceTimeGrid::makeFourDimGrid(GridDefaultLatt(),
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GridDefaultSimd(Nd,vComplex::Nsimd()),
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GridDefaultMpi());
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GridRedBlackCartesian * UrbGrid = SpaceTimeGrid::makeFourDimRedBlackGrid(UGrid);
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GridCartesian * FGrid = SpaceTimeGrid::makeFiveDimGrid(Ls,UGrid);
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GridRedBlackCartesian * FrbGrid = SpaceTimeGrid::makeFiveDimRedBlackGrid(Ls,UGrid);
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// Construct a coarsened grid with 4^4 cell
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Coordinate Block({4,4,4,4});
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Coordinate clatt = GridDefaultLatt();
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for(int d=0;d<clatt.size();d++){
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clatt[d] = clatt[d]/Block[d];
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}
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GridCartesian *Coarse4d = SpaceTimeGrid::makeFourDimGrid(clatt,
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GridDefaultSimd(Nd,vComplex::Nsimd()),
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GridDefaultMpi());;
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GridCartesian *Coarse5d = SpaceTimeGrid::makeFiveDimGrid(1,Coarse4d);
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///////////////////////// RNGs /////////////////////////////////
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std::vector<int> seeds4({1,2,3,4});
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std::vector<int> seeds5({5,6,7,8});
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std::vector<int> cseeds({5,6,7,8});
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GridParallelRNG RNG5(FGrid); RNG5.SeedFixedIntegers(seeds5);
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GridParallelRNG RNG4(UGrid); RNG4.SeedFixedIntegers(seeds4);
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GridParallelRNG CRNG(Coarse5d);CRNG.SeedFixedIntegers(cseeds);
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///////////////////////// Configuration /////////////////////////////////
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LatticeGaugeField Umu(UGrid);
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FieldMetaData header;
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std::string file("ckpoint_EODWF_lat.125");
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NerscIO::readConfiguration(Umu,header,file);
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//////////////////////// Fermion action //////////////////////////////////
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MobiusFermionD Ddwf(Umu,*FGrid,*FrbGrid,*UGrid,*UrbGrid,mass,M5,b,c);
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SchurDiagMooeeOperator<MobiusFermionD, LatticeFermion> HermOpEO(Ddwf);
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typedef HermOpAdaptor<LatticeFermionD> HermFineMatrix;
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HermFineMatrix FineHermOp(HermOpEO);
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////////////////////////////////////////////////////////////
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///////////// Coarse basis and Little Dirac Operator ///////
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////////////////////////////////////////////////////////////
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typedef GeneralCoarsenedMatrix<vSpinColourVector,vTComplex,nbasis> LittleDiracOperator;
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typedef LittleDiracOperator::CoarseVector CoarseVector;
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NextToNextToNextToNearestStencilGeometry5D geom(Coarse5d);
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typedef Aggregation<vSpinColourVector,vTComplex,nbasis> Subspace;
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Subspace Aggregates(Coarse5d,FrbGrid,cb);
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////////////////////////////////////////////////////////////
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// Need to check about red-black grid coarsening
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////////////////////////////////////////////////////////////
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int refine=1;
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// Aggregates.CreateSubspaceMultishift(RNG5,HermOpEO,
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// 0.0003,1.0e-5,2000); // Lo, tol, maxit
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// Aggregates.CreateSubspaceChebyshev(RNG5,HermOpEO,nbasis,95.,0.01,1500);// <== last run
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std::cout << "**************************************"<<std::endl;
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std::cout << "Create Subspace"<<std::endl;
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std::cout << "**************************************"<<std::endl;
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Aggregates.CreateSubspaceChebyshevNew(RNG5,HermOpEO,95.);
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std::cout << "**************************************"<<std::endl;
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std::cout << "Refine Subspace"<<std::endl;
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std::cout << "**************************************"<<std::endl;
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Aggregates.RefineSubspace(HermOpEO,0.001,1.0e-3,3000); // 172 iters
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std::cout << "**************************************"<<std::endl;
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std::cout << "Coarsen after refine"<<std::endl;
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std::cout << "**************************************"<<std::endl;
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Aggregates.Orthogonalise();
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std::cout << "**************************************"<<std::endl;
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std::cout << "Building MultiRHS Coarse operator"<<std::endl;
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std::cout << "**************************************"<<std::endl;
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ConjugateGradient<CoarseVector> coarseCG(4.0e-2,20000,true);
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const int nrhs=12;
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Coordinate mpi=GridDefaultMpi();
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Coordinate rhMpi ({1,1,mpi[0],mpi[1],mpi[2],mpi[3]});
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Coordinate rhLatt({nrhs,1,clatt[0],clatt[1],clatt[2],clatt[3]});
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Coordinate rhSimd({vComplex::Nsimd(),1, 1,1,1,1});
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GridCartesian *CoarseMrhs = new GridCartesian(rhLatt,rhSimd,rhMpi);
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typedef MultiGeneralCoarsenedMatrix<vSpinColourVector,vTComplex,nbasis> MultiGeneralCoarsenedMatrix_t;
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MultiGeneralCoarsenedMatrix_t mrhs(geom,CoarseMrhs);
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mrhs.CoarsenOperator(FineHermOp,Aggregates,Coarse5d);
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std::cout << "**************************************"<<std::endl;
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std::cout << " Coarse Lanczos "<<std::endl;
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std::cout << "**************************************"<<std::endl;
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typedef HermitianLinearOperator<MultiGeneralCoarsenedMatrix_t,CoarseVector> MrhsHermMatrix;
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Chebyshev<CoarseVector> IRLCheby(0.01,42.0,301); // 1 iter
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MrhsHermMatrix MrhsCoarseOp (mrhs);
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CoarseVector pm_src(CoarseMrhs);
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pm_src = ComplexD(1.0);
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PowerMethod<CoarseVector> cPM;
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cPM(MrhsCoarseOp,pm_src);
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int Nk=192;
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int Nm=384;
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int Nstop=Nk;
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int Nconv_test_interval=1;
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ImplicitlyRestartedBlockLanczosCoarse<CoarseVector> IRL(MrhsCoarseOp,
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Coarse5d,
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CoarseMrhs,
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nrhs,
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IRLCheby,
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Nstop,
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Nconv_test_interval,
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nrhs,
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Nk,
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Nm,
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1e-5,10);
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int Nconv;
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std::vector<RealD> eval(Nm);
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std::vector<CoarseVector> evec(Nm,Coarse5d);
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std::vector<CoarseVector> c_src(nrhs,Coarse5d);
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//////////////////////////////////////////
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// Block projector for coarse/fine
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//////////////////////////////////////////
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std::cout << "**************************************"<<std::endl;
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std::cout << "Calling mRHS HDCG"<<std::endl;
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std::cout << "**************************************"<<std::endl;
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MultiRHSBlockProject<LatticeFermionD> MrhsProjector;
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MrhsProjector.Allocate(nbasis,FrbGrid,Coarse5d);
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MrhsProjector.ImportBasis(Aggregates.subspace);
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std::cout << "**************************************"<<std::endl;
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std::cout << " Recompute coarse evecs "<<std::endl;
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std::cout << "**************************************"<<std::endl;
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evec.resize(Nm,Coarse5d);
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eval.resize(Nm);
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for(int r=0;r<nrhs;r++){
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random(CRNG,c_src[r]);
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}
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IRL.calc(eval,evec,c_src,Nconv,LanczosType::irbl);
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///////////////////////
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// Deflation guesser object
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///////////////////////
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std::cout << "**************************************"<<std::endl;
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std::cout << " Reimport coarse evecs "<<std::endl;
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std::cout << "**************************************"<<std::endl;
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MultiRHSDeflation<CoarseVector> MrhsGuesser;
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MrhsGuesser.ImportEigenBasis(evec,eval);
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//////////////////////////
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// Extra HDCG parameters
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//////////////////////////
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int maxit=3000;
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ConjugateGradient<CoarseVector> CG(5.0e-2,maxit,false);
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RealD lo=2.0;
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int ord = 7;
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DoNothingGuesser<CoarseVector> DoNothing;
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HPDSolver<CoarseVector> HPDSolveMrhs(MrhsCoarseOp,CG,DoNothing);
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/////////////////////////////////////////////////
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// Mirs smoother
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/////////////////////////////////////////////////
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RealD MirsShift = lo;
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ShiftedHermOpLinearOperator<LatticeFermionD> ShiftedFineHermOp(HermOpEO,MirsShift);
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CGSmoother<LatticeFermionD> CGsmooth(ord,ShiftedFineHermOp) ;
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TwoLevelADEF2mrhs<LatticeFermion,CoarseVector>
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HDCGmrhs(1.0e-8, 500,
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FineHermOp,
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CGsmooth,
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HPDSolveMrhs, // Used in M1
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HPDSolveMrhs, // Used in Vstart
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MrhsProjector,
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MrhsGuesser,
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CoarseMrhs);
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std::vector<LatticeFermionD> src_mrhs(nrhs,FrbGrid);
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std::vector<LatticeFermionD> res_mrhs(nrhs,FrbGrid);
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for(int r=0;r<nrhs;r++){
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random(RNG5,src_mrhs[r]);
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res_mrhs[r]=Zero();
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}
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HDCGmrhs(src_mrhs,res_mrhs);
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// Standard CG
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#if 1
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{
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std::cout << "**************************************"<<std::endl;
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std::cout << "Calling red black CG"<<std::endl;
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std::cout << "**************************************"<<std::endl;
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LatticeFermion result(FrbGrid); result=Zero();
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LatticeFermion src(FrbGrid); random(RNG5,src);
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result=Zero();
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ConjugateGradient<LatticeFermionD> CGfine(1.0e-8,30000,false);
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CGfine(HermOpEO, src, result);
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}
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#endif
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Grid_finalize();
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return 0;
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}
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