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Grid/tests/lanczos/Test_compressed_lanczos_gparity.cc
Peter Boyle 677b4cc5b0 Make all tests compile
2025-04-24 20:33:26 -04:00

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/*************************************************************************************
Grid physics library, www.github.com/paboyle/Grid
Source file: ./tests/Test_compressed_lanczos_gparity.cc
Copyright (C) 2017
Author: Christopher Kelly <ckelly@bnl.gov>
Author: Leans heavily on Christoph Lehner's code
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 */
/*
* Reimplement the badly named "multigrid" lanczos as compressed Lanczos using the features
* in Grid that were intended to be used to support blocked Aggregates, from
*/
#include <Grid/Grid.h>
#include <Grid/algorithms/iterative/ImplicitlyRestartedLanczos.h>
#include <Grid/algorithms/iterative/LocalCoherenceLanczos.h>
#ifdef ENABLE_GPARITY
using namespace std;
using namespace Grid;
//For the CPS configurations we have to manually seed the RNG and deal with an incorrect factor of 2 in the plaquette metadata
void readConfiguration(LatticeGaugeFieldD &U,
const std::string &config,
bool is_cps_cfg = false){
if(is_cps_cfg) NerscIO::exitOnReadPlaquetteMismatch() = false;
typedef GaugeStatistics<ConjugateGimplD> GaugeStats;
FieldMetaData header;
NerscIO::readConfiguration<GaugeStats>(U, header, config);
if(is_cps_cfg) NerscIO::exitOnReadPlaquetteMismatch() = true;
}
//Lanczos parameters in CPS conventions
struct CPSLanczosParams : Serializable {
public:
GRID_SERIALIZABLE_CLASS_MEMBERS(CPSLanczosParams,
RealD, alpha,
RealD, beta,
int, ch_ord,
int, N_use,
int, N_get,
int, N_true_get,
RealD, stop_rsd,
int, maxits);
//Translations
ChebyParams getChebyParams() const{
ChebyParams out;
out.alpha = beta*beta; //aka lo
out.beta = alpha*alpha; //aka hi
out.Npoly = ch_ord+1;
return out;
}
int Nstop() const{ return N_true_get; }
int Nm() const{ return N_use; }
int Nk() const{ return N_get; }
};
//Maybe this class should be in the main library?
template<class Fobj,class CComplex,int nbasis>
class LocalCoherenceLanczosScidac : public LocalCoherenceLanczos<Fobj,CComplex,nbasis>
{
public:
typedef iVector<CComplex,nbasis > CoarseSiteVector;
typedef Lattice<CoarseSiteVector> CoarseField;
typedef Lattice<CComplex> CoarseScalar; // used for inner products on fine field
typedef Lattice<Fobj> FineField;
LocalCoherenceLanczosScidac(GridBase *FineGrid,GridBase *CoarseGrid,
LinearOperatorBase<FineField> &FineOp,
int checkerboard)
// Base constructor
: LocalCoherenceLanczos<Fobj,CComplex,nbasis>(FineGrid,CoarseGrid,FineOp,checkerboard)
{};
void checkpointFine(std::string evecs_file,std::string evals_file)
{
assert(this->subspace.size()==nbasis);
emptyUserRecord record;
Grid::ScidacWriter WR(this->_FineGrid->IsBoss());
WR.open(evecs_file);
for(int k=0;k<nbasis;k++) {
WR.writeScidacFieldRecord(this->subspace[k],record);
}
WR.close();
XmlWriter WRx(evals_file);
write(WRx,"evals",this->evals_fine);
}
void checkpointFineRestore(std::string evecs_file,std::string evals_file)
{
this->evals_fine.resize(nbasis);
this->subspace.resize(nbasis,this->_FineGrid);
std::cout << GridLogIRL<< "checkpointFineRestore: Reading evals from "<<evals_file<<std::endl;
XmlReader RDx(evals_file);
read(RDx,"evals",this->evals_fine);
if(this->evals_fine.size() < nbasis) assert(0 && "Not enough fine evals to complete basis");
if(this->evals_fine.size() > nbasis){ //allow the use of precomputed evecs with a larger #evecs
std::cout << GridLogMessage << "Truncating " << this->evals_fine.size() << " evals to basis size " << nbasis << std::endl;
this->evals_fine.resize(nbasis);
}
std::cout << GridLogIRL<< "checkpointFineRestore: Reading evecs from "<<evecs_file<<std::endl;
emptyUserRecord record;
Grid::ScidacReader RD ;
RD.open(evecs_file);
for(int k=0;k<nbasis;k++) {
this->subspace[k].Checkerboard()=this->_checkerboard;
RD.readScidacFieldRecord(this->subspace[k],record);
}
RD.close();
}
void checkpointCoarse(std::string evecs_file,std::string evals_file)
{
int n = this->evec_coarse.size();
emptyUserRecord record;
Grid::ScidacWriter WR(this->_CoarseGrid->IsBoss());
WR.open(evecs_file);
for(int k=0;k<n;k++) {
WR.writeScidacFieldRecord(this->evec_coarse[k],record);
}
WR.close();
XmlWriter WRx(evals_file);
write(WRx,"evals",this->evals_coarse);
}
void checkpointCoarseRestore(std::string evecs_file,std::string evals_file,int nvec)
{
std::cout << "resizing coarse vecs to " << nvec<< std::endl;
this->evals_coarse.resize(nvec);
this->evec_coarse.resize(nvec,this->_CoarseGrid);
std::cout << GridLogIRL<< "checkpointCoarseRestore: Reading evals from "<<evals_file<<std::endl;
XmlReader RDx(evals_file);
read(RDx,"evals",this->evals_coarse);
assert(this->evals_coarse.size()==nvec);
emptyUserRecord record;
std::cout << GridLogIRL<< "checkpointCoarseRestore: Reading evecs from "<<evecs_file<<std::endl;
Grid::ScidacReader RD ;
RD.open(evecs_file);
for(int k=0;k<nvec;k++) {
RD.readScidacFieldRecord(this->evec_coarse[k],record);
}
RD.close();
}
};
struct Options{
std::vector<int> blockSize;
std::vector<int> GparityDirs;
int Ls;
RealD mass;
RealD M5;
RealD mobius_scale;
std::string config;
bool is_cps_cfg;
double coarse_relax_tol;
int smoother_ord;
CPSLanczosParams fine;
CPSLanczosParams coarse;
bool write_fine = false;
std::string write_fine_file;
bool read_fine = false;
std::string read_fine_file;
bool write_coarse = false;
std::string write_coarse_file;
bool read_coarse = false;
std::string read_coarse_file;
Options(){
blockSize = std::vector<int> ({2,2,2,2,2});
GparityDirs = std::vector<int> ({1,1,1}); //1 for each GP direction
Ls = 12;
mass = 0.01;
M5 = 1.8;
is_cps_cfg = false;
mobius_scale = 2.0;
fine.alpha = 2;
fine.beta = 0.1;
fine.ch_ord = 100;
fine.N_use = 70;
fine.N_get = 60;
fine.N_true_get = 60;
fine.stop_rsd = 1e-8;
fine.maxits = 10000;
coarse.alpha = 2;
coarse.beta = 0.1;
coarse.ch_ord = 100;
coarse.N_use = 200;
coarse.N_get = 190;
coarse.N_true_get = 190;
coarse.stop_rsd = 1e-8;
coarse.maxits = 10000;
coarse_relax_tol = 1e5;
smoother_ord = 20;
write_fine = false;
read_fine = false;
write_coarse = false;
read_coarse = false;
}
};
template<int nbasis>
void runTest(const Options &opt){
//Fine grids
GridCartesian * UGrid = SpaceTimeGrid::makeFourDimGrid(GridDefaultLatt(), GridDefaultSimd(Nd,vComplex::Nsimd()), GridDefaultMpi());
GridRedBlackCartesian * UrbGrid = SpaceTimeGrid::makeFourDimRedBlackGrid(UGrid);
GridCartesian * FGrid = SpaceTimeGrid::makeFiveDimGrid(opt.Ls,UGrid);
GridRedBlackCartesian * FrbGrid = SpaceTimeGrid::makeFiveDimRedBlackGrid(opt.Ls,UGrid);
//Setup G-parity BCs
assert(Nd == 4);
std::vector<int> dirs4(4);
for(int i=0;i<3;i++) dirs4[i] = opt.GparityDirs[i];
dirs4[3] = 0; //periodic gauge BC in time
std::cout << GridLogMessage << "Gauge BCs: " << dirs4 << std::endl;
ConjugateGimplD::setDirections(dirs4); //gauge BC
GparityWilsonImplD::ImplParams Params;
for(int i=0;i<Nd-1;i++) Params.twists[i] = opt.GparityDirs[i]; //G-parity directions
Params.twists[Nd-1] = 1; //APBC in time direction
std::cout << GridLogMessage << "Fermion BCs: " << Params.twists << std::endl;
//Read the gauge field
LatticeGaugeField Umu(UGrid);
readConfiguration(Umu, opt.config, opt.is_cps_cfg);
//Setup the coarse grids
auto fineLatt = GridDefaultLatt();
Coordinate coarseLatt(4);
for (int d=0;d<4;d++){
coarseLatt[d] = fineLatt[d]/opt.blockSize[d]; assert(coarseLatt[d]*opt.blockSize[d]==fineLatt[d]);
}
std::cout << GridLogMessage<< " 5d coarse lattice is ";
for (int i=0;i<4;i++){
std::cout << coarseLatt[i]<<"x";
}
int cLs = opt.Ls/opt.blockSize[4]; assert(cLs*opt.blockSize[4]==opt.Ls);
std::cout << cLs<<std::endl;
GridCartesian * CoarseGrid4 = SpaceTimeGrid::makeFourDimGrid(coarseLatt, GridDefaultSimd(Nd,vComplex::Nsimd()),GridDefaultMpi());
GridRedBlackCartesian * CoarseGrid4rb = SpaceTimeGrid::makeFourDimRedBlackGrid(CoarseGrid4);
GridCartesian * CoarseGrid5 = SpaceTimeGrid::makeFiveDimGrid(cLs,CoarseGrid4);
//Dirac operator
double bmc = 1.;
double b = (opt.mobius_scale + bmc)/2.; // b = 1/2 [ (b+c) + (b-c) ]
double c = (opt.mobius_scale - bmc)/2.; // c = 1/2 [ (b+c) - (b-c) ]
GparityMobiusFermionD action(Umu, *FGrid, *FrbGrid, *UGrid, *UrbGrid, opt.mass, opt.M5, b,c,Params);
typedef GparityMobiusFermionD::FermionField FermionField;
SchurDiagTwoOperator<GparityMobiusFermionD, FermionField> SchurOp(action);
typedef GparityWilsonImplD::SiteSpinor SiteSpinor;
const CPSLanczosParams &fine = opt.fine;
const CPSLanczosParams &coarse = opt.coarse;
std::cout << GridLogMessage << "Keep " << fine.N_true_get << " fine vectors" << std::endl;
std::cout << GridLogMessage << "Keep " << coarse.N_true_get << " coarse vectors" << std::endl;
assert(coarse.N_true_get >= fine.N_true_get);
assert(nbasis<=fine.N_true_get);
LocalCoherenceLanczosScidac<SiteSpinor,vTComplex,nbasis> _LocalCoherenceLanczos(FrbGrid,CoarseGrid5,SchurOp,Odd);
std::cout << GridLogMessage << "Constructed LocalCoherenceLanczos" << std::endl;
//Compute and/or read fine evecs
if(opt.read_fine){
_LocalCoherenceLanczos.checkpointFineRestore(opt.read_fine_file + "_evecs.scidac", opt.read_fine_file + "_evals.xml");
}else{
std::cout << GridLogMessage << "Performing fine grid IRL" << std::endl;
std::cout << GridLogMessage << "Using Chebyshev alpha=" << fine.alpha << " beta=" << fine.beta << " ord=" << fine.ch_ord << std::endl;
_LocalCoherenceLanczos.calcFine(fine.getChebyParams(),
fine.Nstop(),fine.Nk(),fine.Nm(),
fine.stop_rsd,fine.maxits,0,0);
if(opt.write_fine){
std::cout << GridLogIRL<<"Checkpointing Fine evecs"<<std::endl;
_LocalCoherenceLanczos.checkpointFine(opt.write_fine_file + "_evecs.scidac", opt.write_fine_file + "_evals.xml");
}
}
//Block orthonormalise (this should be part of calcFine?)
std::cout << GridLogIRL<<"Orthogonalising"<<std::endl;
_LocalCoherenceLanczos.Orthogonalise();
std::cout << GridLogIRL<<"Orthogonaled"<<std::endl;
ChebyParams smoother = fine.getChebyParams();
smoother.Npoly = opt.smoother_ord+1;
if(opt.read_coarse){
_LocalCoherenceLanczos.checkpointCoarseRestore(opt.read_coarse_file + "_evecs.scidac", opt.read_coarse_file + "_evals.xml",coarse.Nstop());
}else{
std::cout << GridLogMessage << "Performing coarse grid IRL" << std::endl;
std::cout << GridLogMessage << "Using Chebyshev alpha=" << coarse.alpha << " beta=" << coarse.beta << " ord=" << coarse.ch_ord << std::endl;
_LocalCoherenceLanczos.calcCoarse(coarse.getChebyParams(), smoother, opt.coarse_relax_tol,
coarse.Nstop(), coarse.Nk() ,coarse.Nm(),
coarse.stop_rsd, coarse.maxits,
0,0);
if(opt.write_coarse){
std::cout << GridLogIRL<<"Checkpointing Coarse evecs"<<std::endl;
_LocalCoherenceLanczos.checkpointCoarse(opt.write_coarse_file + "_evecs.scidac", opt.write_coarse_file + "_evals.xml");
}
}
//Test the eigenvectors
//To remove high-frequency noise we apply a Chebyshev smoothing
Chebyshev<FermionField> cheb_smoother(smoother);
FermionField evec(FrbGrid);
FermionField evec_sm(FrbGrid); //smoothed
FermionField tmp(FrbGrid);
RealD eval;
for(int i=0;i<coarse.N_true_get;i++){
_LocalCoherenceLanczos.getFineEvecEval(evec, eval, i);
//Check unsmoothed evec
SchurOp.HermOp(evec, tmp);
tmp = tmp - eval*evec;
RealD norm_unsmoothed = sqrt(norm2(tmp));
//Check smoothed evec
cheb_smoother(SchurOp, evec, evec_sm);
SchurOp.HermOp(evec_sm, tmp);
tmp = tmp - eval*evec_sm;
RealD norm_smoothed = sqrt(norm2(tmp));
std::cout << GridLogMessage << "Eval " << eval << " unsmoothed resid " << norm_unsmoothed << " smoothed resid " << norm_smoothed << std::endl;
}
}
//Note: because we rely upon physical properties we must use a "real" gauge configuration
int main (int argc, char ** argv)
{
Grid_init(&argc,&argv);
GridLogIRL.TimingMode(1);
Options opt;
int basis_size = 100;
if(argc < 3){
std::cout << GridLogMessage << "Usage: <exe> <config> <gparity dirs> <options>" << std::endl;
std::cout << GridLogMessage << "<gparity dirs> should have the format a.b.c where a,b,c are 0,1 depending on whether there are G-parity BCs in that direction" << std::endl;
std::cout << GridLogMessage << "Options:" << std::endl;
std::cout << GridLogMessage << "--Ls <value> : Set Ls (default 12)" << std::endl;
std::cout << GridLogMessage << "--mass <value> : Set the mass (default 0.01)" << std::endl;
std::cout << GridLogMessage << "--block <value> : Set the block size. Format should be a.b.c.d.e where a-e are the block extents (default 2.2.2.2.2)" << std::endl;
std::cout << GridLogMessage << "--is_cps_cfg : Indicate that the configuration was generated with CPS where until recently the stored plaquette was wrong by a factor of 2" << std::endl;
std::cout << GridLogMessage << "--write_irl_templ: Write a template for the parameters file of the Lanczos to \"irl_templ.xml\"" << std::endl;
std::cout << GridLogMessage << "--read_irl_fine <filename>: Real the parameters file for the fine Lanczos" << std::endl;
std::cout << GridLogMessage << "--read_irl_coarse <filename>: Real the parameters file for the coarse Lanczos" << std::endl;
std::cout << GridLogMessage << "--write_fine <filename stub>: Write fine evecs/evals to filename starting with the stub" << std::endl;
std::cout << GridLogMessage << "--read_fine <filename stub>: Read fine evecs/evals from filename starting with the stub" << std::endl;
std::cout << GridLogMessage << "--write_coarse <filename stub>: Write coarse evecs/evals to filename starting with the stub" << std::endl;
std::cout << GridLogMessage << "--read_coarse <filename stub>: Read coarse evecs/evals from filename starting with the stub" << std::endl;
std::cout << GridLogMessage << "--smoother_ord : Set the Chebyshev order of the smoother (default 20)" << std::endl;
std::cout << GridLogMessage << "--coarse_relax_tol : Set the relaxation parameter for evaluating the residual of the reconstructed eigenvectors outside of the basis (default 1e5)" << std::endl;
std::cout << GridLogMessage << "--basis_size : Select the basis size from 100,200,300,350 (default 100)" << std::endl;
Grid_finalize();
return 1;
}
opt.config = argv[1];
GridCmdOptionIntVector(argv[2], opt.GparityDirs);
assert(opt.GparityDirs.size() == 3);
for(int i=3;i<argc;i++){
std::string sarg = argv[i];
if(sarg == "--Ls"){
opt.Ls = std::stoi(argv[i+1]);
std::cout << GridLogMessage << "Set Ls to " << opt.Ls << std::endl;
}else if(sarg == "--mass"){
std::istringstream ss(argv[i+1]); ss >> opt.mass;
std::cout << GridLogMessage << "Set quark mass to " << opt.mass << std::endl;
}else if(sarg == "--block"){
GridCmdOptionIntVector(argv[i+1], opt.blockSize);
assert(opt.blockSize.size() == 5);
std::cout << GridLogMessage << "Set block size to ";
for(int q=0;q<5;q++) std::cout << opt.blockSize[q] << " ";
std::cout << std::endl;
}else if(sarg == "--is_cps_cfg"){
opt.is_cps_cfg = true;
}else if(sarg == "--write_irl_templ"){
XmlWriter writer("irl_templ.xml");
write(writer,"Params", opt.fine);
Grid_finalize();
return 0;
}else if(sarg == "--read_irl_fine"){
std::cout << GridLogMessage << "Reading fine IRL params from " << argv[i+1] << std::endl;
XmlReader reader(argv[i+1]);
read(reader, "Params", opt.fine);
}else if(sarg == "--read_irl_coarse"){
std::cout << GridLogMessage << "Reading coarse IRL params from " << argv[i+1] << std::endl;
XmlReader reader(argv[i+1]);
read(reader, "Params", opt.coarse);
}else if(sarg == "--write_fine"){
opt.write_fine = true;
opt.write_fine_file = argv[i+1];
}else if(sarg == "--read_fine"){
opt.read_fine = true;
opt.read_fine_file = argv[i+1];
}else if(sarg == "--write_coarse"){
opt.write_coarse = true;
opt.write_coarse_file = argv[i+1];
}else if(sarg == "--read_coarse"){
opt.read_coarse = true;
opt.read_coarse_file = argv[i+1];
}else if(sarg == "--smoother_ord"){
std::istringstream ss(argv[i+1]); ss >> opt.smoother_ord;
std::cout << GridLogMessage << "Set smoother order to " << opt.smoother_ord << std::endl;
}else if(sarg == "--coarse_relax_tol"){
std::istringstream ss(argv[i+1]); ss >> opt.coarse_relax_tol;
std::cout << GridLogMessage << "Set coarse IRL relaxation parameter to " << opt.coarse_relax_tol << std::endl;
}else if(sarg == "--mobius_scale"){
std::istringstream ss(argv[i+1]); ss >> opt.mobius_scale;
std::cout << GridLogMessage << "Set Mobius scale to " << opt.mobius_scale << std::endl;
}else if(sarg == "--basis_size"){
basis_size = std::stoi(argv[i+1]);
std::cout << GridLogMessage << "Set basis size to " << basis_size << std::endl;
}
}
switch(basis_size){
case 100:
runTest<100>(opt); break;
case 200:
runTest<200>(opt); break;
case 300:
runTest<300>(opt); break;
case 350:
runTest<350>(opt); break;
default:
std::cout << GridLogMessage << "Unsupported basis size " << basis_size << std::endl;
assert(0);
}
Grid_finalize();
}
#else
int main(int argc, char **argv){};
#endif
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