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Grid/tests/debug/Test_general_coarse_wilson_svd.cc

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/*************************************************************************************
Grid physics library, www.github.com/paboyle/Grid
Source file: ./tests/Test_padded_cell.cc
Copyright (C) 2023
Author: Peter Boyle <paboyle@ph.ed.ac.uk>
This program 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 2 of the License, or
(at your option) any later version.
This program 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 this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
See the full license in the file "LICENSE" in the top level distribution directory
*************************************************************************************/
/* END LEGAL */
#include <Grid/Grid.h>
#include <Grid/lattice/PaddedCell.h>
#include <Grid/stencil/GeneralLocalStencil.h>
#include <Grid/algorithms/iterative/PrecGeneralisedConjugateResidual.h>
#include <Grid/algorithms/iterative/PrecGeneralisedConjugateResidualNonHermitian.h>
#include <Grid/algorithms/iterative/BiCGSTAB.h>
using namespace std;
using namespace Grid;
template<class Fobj,class CComplex,int nbasis>
class MGPreconditioner : public LinearFunction< Lattice<Fobj> > {
public:
using LinearFunction<Lattice<Fobj> >::operator();
typedef Aggregation<Fobj,CComplex,nbasis> Aggregates;
typedef typename Aggregation<Fobj,CComplex,nbasis>::FineField FineField;
typedef typename Aggregation<Fobj,CComplex,nbasis>::CoarseVector CoarseVector;
typedef typename Aggregation<Fobj,CComplex,nbasis>::CoarseMatrix CoarseMatrix;
typedef LinearOperatorBase<FineField> FineOperator;
typedef LinearFunction <FineField> FineSmoother;
typedef LinearOperatorBase<CoarseVector> CoarseOperator;
typedef LinearFunction <CoarseVector> CoarseSolver;
Aggregates & _Aggregates;
FineOperator & _FineOperator;
FineSmoother & _PreSmoother;
FineSmoother & _PostSmoother;
CoarseOperator & _CoarseOperator;
CoarseSolver & _CoarseSolve;
int level; void Level(int lv) {level = lv; };
MGPreconditioner(Aggregates &Agg,
FineOperator &Fine,
FineSmoother &PreSmoother,
FineSmoother &PostSmoother,
CoarseOperator &CoarseOperator_,
CoarseSolver &CoarseSolve_)
: _Aggregates(Agg),
_FineOperator(Fine),
_PreSmoother(PreSmoother),
_PostSmoother(PostSmoother),
_CoarseOperator(CoarseOperator_),
_CoarseSolve(CoarseSolve_),
level(1) { }
virtual void operator()(const FineField &in, FineField & out)
{
GridBase *CoarseGrid = _Aggregates.CoarseGrid;
// auto CoarseGrid = _CoarseOperator.Grid();
CoarseVector Csrc(CoarseGrid);
CoarseVector Csol(CoarseGrid);
FineField vec1(in.Grid());
FineField vec2(in.Grid());
std::cout<<GridLogMessage << "Calling PreSmoother " <<std::endl;
// std::cout<<GridLogMessage << "Calling PreSmoother input residual "<<norm2(in) <<std::endl;
double t;
// Fine Smoother
// out = in;
out = Zero();
t=-usecond();
_PreSmoother(in,out);
t+=usecond();
std::cout<<GridLogMessage << "PreSmoother took "<< t/1000.0<< "ms" <<std::endl;
// Update the residual
_FineOperator.Op(out,vec1); sub(vec1, in ,vec1);
// std::cout<<GridLogMessage <<"Residual-1 now " <<norm2(vec1)<<std::endl;
// Fine to Coarse
t=-usecond();
_Aggregates.ProjectToSubspace (Csrc,vec1);
t+=usecond();
std::cout<<GridLogMessage << "Project to coarse took "<< t/1000.0<< "ms" <<std::endl;
// Coarse correction
t=-usecond();
Csol = Zero();
_CoarseSolve(Csrc,Csol);
//Csol=Zero();
t+=usecond();
std::cout<<GridLogMessage << "Coarse solve took "<< t/1000.0<< "ms" <<std::endl;
// Coarse to Fine
t=-usecond();
// _CoarseOperator.PromoteFromSubspace(_Aggregates,Csol,vec1);
_Aggregates.PromoteFromSubspace(Csol,vec1);
add(out,out,vec1);
t+=usecond();
std::cout<<GridLogMessage << "Promote to this level took "<< t/1000.0<< "ms" <<std::endl;
// Residual
_FineOperator.Op(out,vec1); sub(vec1 ,in , vec1);
// std::cout<<GridLogMessage <<"Residual-2 now " <<norm2(vec1)<<std::endl;
// Fine Smoother
t=-usecond();
// vec2=vec1;
vec2=Zero();
_PostSmoother(vec1,vec2);
t+=usecond();
std::cout<<GridLogMessage << "PostSmoother took "<< t/1000.0<< "ms" <<std::endl;
add( out,out,vec2);
std::cout<<GridLogMessage << "Done " <<std::endl;
}
};
int main (int argc, char ** argv)
{
Grid_init(&argc,&argv);
const int Ls=16;
GridCartesian * UGrid = SpaceTimeGrid::makeFourDimGrid(GridDefaultLatt(), GridDefaultSimd(Nd,vComplex::Nsimd()),GridDefaultMpi());
GridRedBlackCartesian * UrbGrid = SpaceTimeGrid::makeFourDimRedBlackGrid(UGrid);
GridCartesian * FGrid = UGrid;
GridRedBlackCartesian * FrbGrid = UrbGrid;
// Construct a coarsened grid
Coordinate clatt = GridDefaultLatt();
for(int d=0;d<clatt.size();d++){
clatt[d] = clatt[d]/2;
// clatt[d] = clatt[d]/4;
}
GridCartesian *Coarse4d = SpaceTimeGrid::makeFourDimGrid(clatt, GridDefaultSimd(Nd,vComplex::Nsimd()),GridDefaultMpi());;
std::vector<int> seeds4({1,2,3,4});
std::vector<int> cseeds({5,6,7,8});
GridParallelRNG RNG4(UGrid); RNG4.SeedFixedIntegers(seeds4);
GridParallelRNG CRNG(Coarse4d);CRNG.SeedFixedIntegers(cseeds);
LatticeFermion src(FGrid); random(RNG4,src);
LatticeFermion result(FGrid); result=Zero();
LatticeFermion ref(FGrid); ref=Zero();
LatticeFermion tmp(FGrid);
LatticeFermion err(FGrid);
LatticeGaugeField Umu(UGrid);
FieldMetaData header;
std::string file("ckpoint_lat.1000");
NerscIO::readConfiguration(Umu,header,file);
RealD csw =1.0;
RealD mass=-0.6222;
WilsonCloverFermionD Dw(Umu,*UGrid,*UrbGrid,mass,csw,csw);
const int nbasis = 20;
const int cb = 0 ;
LatticeFermion prom(FGrid);
typedef GeneralCoarsenedMatrix<vSpinColourVector,vTComplex,2*nbasis> LittleDiracOperator;
typedef LittleDiracOperator::CoarseVector CoarseVector;
NearestStencilGeometry4D geom(Coarse4d);
std::cout<<GridLogMessage<<std::endl;
std::cout<<GridLogMessage<<"*******************************************"<<std::endl;
std::cout<<GridLogMessage<<std::endl;
// Warning: This routine calls Linop.Op, not LinOpo.HermOp
typedef Aggregation<vSpinColourVector,vTComplex,nbasis> Subspace;
Subspace Aggregates(Coarse4d,FGrid,cb);
MdagMLinearOperator<WilsonCloverFermionD,LatticeFermion> MdagMOpDw(Dw);
NonHermitianLinearOperator<WilsonCloverFermionD,LatticeFermion> LinOpDw(Dw);
ShiftedNonHermitianLinearOperator<WilsonCloverFermionD,LatticeFermion> ShiftedLinOpDw(Dw,0.5);
// Aggregates.CreateSubspaceGCR(RNG4,
// LinOpDw,
// nbasis);
Aggregates.CreateSubspace(RNG4,MdagMOpDw,nbasis);
typedef Aggregation<vSpinColourVector,vTComplex,2*nbasis> CombinedSubspace;
CombinedSubspace CombinedUV(Coarse4d,UGrid,cb);
for(int b=0;b<nbasis;b++){
Gamma G5(Gamma::Algebra::Gamma5);
CombinedUV.subspace[b] = Aggregates.subspace[b];
CombinedUV.subspace[b+nbasis] = G5*Aggregates.subspace[b];
}
LittleDiracOperator LittleDiracOp(geom,FGrid,Coarse4d);
LittleDiracOp.CoarsenOperator(LinOpDw,CombinedUV);
std::cout<<GridLogMessage<<std::endl;
std::cout<<GridLogMessage<<"*******************************************"<<std::endl;
std::cout<<GridLogMessage<<std::endl;
std::cout<<GridLogMessage<<"Testing coarsened operator "<<std::endl;
CoarseVector c_src (Coarse4d);
CoarseVector c_res (Coarse4d);
CoarseVector c_proj(Coarse4d);
std::vector<LatticeFermion> subspace(2*nbasis,FGrid);
subspace=CombinedUV.subspace;
Complex one(1.0);
c_src = one; // 1 in every element for vector 1.
blockPromote(c_src,err,subspace);
prom=Zero();
for(int b=0;b<2*nbasis;b++){
prom=prom+subspace[b];
}
err=err-prom;
std::cout<<GridLogMessage<<"Promoted back from subspace: err "<<norm2(err)<<std::endl;
std::cout<<GridLogMessage<<"c_src "<<norm2(c_src)<<std::endl;
std::cout<<GridLogMessage<<"prom "<<norm2(prom)<<std::endl;
LinOpDw.Op(prom,tmp);
blockProject(c_proj,tmp,subspace);
std::cout<<GridLogMessage<<" Called Big Dirac Op "<<norm2(tmp)<<std::endl;
LittleDiracOp.M(c_src,c_res);
std::cout<<GridLogMessage<<" Called Little Dirac Op c_src "<< norm2(c_src) << " c_res "<< norm2(c_res) <<std::endl;
std::cout<<GridLogMessage<<"Little dop : "<<norm2(c_res)<<std::endl;
// std::cout<<GridLogMessage<<" Little "<< c_res<<std::endl;
std::cout<<GridLogMessage<<"Big dop in subspace : "<<norm2(c_proj)<<std::endl;
// std::cout<<GridLogMessage<<" Big "<< c_proj<<std::endl;
c_proj = c_proj - c_res;
std::cout<<GridLogMessage<<" ldop error: "<<norm2(c_proj)<<std::endl;
// std::cout<<GridLogMessage<<" error "<< c_proj<<std::endl;
/**********
* Some solvers
**********
*/
///////////////////////////////////////
// Coarse grid solver test
///////////////////////////////////////
std::cout<<GridLogMessage<<"******************* "<<std::endl;
std::cout<<GridLogMessage<<" Coarse Grid Solve -- Level 3 "<<std::endl;
std::cout<<GridLogMessage<<"******************* "<<std::endl;
TrivialPrecon<CoarseVector> simple;
NonHermitianLinearOperator<LittleDiracOperator,CoarseVector> LinOpCoarse(LittleDiracOp);
// PrecGeneralisedConjugateResidualNonHermitian<CoarseVector> L2PGCR(1.0e-4, 100, LinOpCoarse,simple,10,10);
PrecGeneralisedConjugateResidualNonHermitian<CoarseVector> L2PGCR(3.0e-2, 100, LinOpCoarse,simple,10,10);
L2PGCR.Level(3);
c_res=Zero();
L2PGCR(c_src,c_res);
////////////////////////////////////////
// Fine grid smoother
////////////////////////////////////////
std::cout<<GridLogMessage<<"******************* "<<std::endl;
std::cout<<GridLogMessage<<" Fine Grid Smoother -- Level 2 "<<std::endl;
std::cout<<GridLogMessage<<"******************* "<<std::endl;
TrivialPrecon<LatticeFermionD> simple_fine;
PrecGeneralisedConjugateResidualNonHermitian<LatticeFermionD> SmootherGCR(0.01,1,ShiftedLinOpDw,simple_fine,16,16);
SmootherGCR.Level(2);
LatticeFermionD f_src(FGrid);
LatticeFermionD f_res(FGrid);
f_src = one; // 1 in every element for vector 1.
f_res=Zero();
SmootherGCR(f_src,f_res);
typedef MGPreconditioner<vSpinColourVector, vTComplex,2*nbasis> TwoLevelMG;
TwoLevelMG TwoLevelPrecon(CombinedUV,
LinOpDw,
simple_fine,
SmootherGCR,
LinOpCoarse,
L2PGCR);
PrecGeneralisedConjugateResidualNonHermitian<LatticeFermion> L1PGCR(1.0e-8,1000,LinOpDw,TwoLevelPrecon,16,16);
L1PGCR.Level(1);
f_res=Zero();
L1PGCR(f_src,f_res);
std::cout<<GridLogMessage<<std::endl;
std::cout<<GridLogMessage<<"*******************************************"<<std::endl;
std::cout<<GridLogMessage<<std::endl;
std::cout<<GridLogMessage << "Done "<< std::endl;
Grid_finalize();
return 0;
}