test_Spectrum_Overlap_2ptFunction.cpp

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#include "test.h"
 
#include "Eigen/eigensolver_IRLanczos.h"
 
#include "Fopr/fopr_Overlap.h"
 
#include "IO/gaugeConfig.h"
 
#include "Measurements/Fermion/corr2pt_4spinor.h"
#include "Measurements/Fermion/source.h"
#include "Measurements/Gauge/gaugeFixing.h"
 
#include "Solver/solver.h"
 
#include "Tools/gammaMatrixSet.h"
#include "Tools/randomNumberManager.h"
 
//====================================================================
 
namespace Test_Spectrum_Overlap {
  const std::string test_name = "Spectrum.Overlap.Hadron2ptFunction";
 
  //- test-private parameters
  namespace {
    const std::string filename_input = "test_Spectrum_Overlap_Hadron2ptFunction.yaml";
  }
 
  //- prototype declaration
  int hadron_2ptFunction(void);
 
#ifdef USE_TESTMANAGER_AUTOREGISTER
  namespace {
#if defined(USE_GROUP_SU2)
    // Nc=2 is not available.
#else
    static const bool is_registered = TestManager::RegisterTest(
      test_name,
      hadron_2ptFunction
      );
#endif
  }
#endif
 
  //====================================================================
  int hadron_2ptFunction(void)
  {
    // ####  parameter setup  ####
    const int Ndim = CommonParameters::Ndim();
    const int Nc   = CommonParameters::Nc();
    const int Nd   = CommonParameters::Nd();
    const int Nvol = CommonParameters::Nvol();
 
    const Parameters params_all = ParameterManager::read(filename_input);
 
    const Parameters params_test      = params_all.lookup("Test_Spectrum_Overlap");
    const Parameters params_gfix      = params_all.lookup("GaugeFixing");
    const Parameters params_wilson    = params_all.lookup("Fopr_Wilson");
    const Parameters params_overlap   = params_all.lookup("Fopr_Overlap");
    const Parameters params_irlanczos = params_all.lookup("Eigensolver");
    const Parameters params_solver    = params_all.lookup("Solver");
    const Parameters params_source    = params_all.lookup("Source");
 
    const string        str_gconf_status = params_test.get_string("gauge_config_status");
    const string        str_gconf_read   = params_test.get_string("gauge_config_type_input");
    const string        readfile         = params_test.get_string("config_filename_input");
    const string        str_rand_type    = params_test.get_string("random_number_type");
    const unsigned long seed             = params_test.get_unsigned_long("seed_for_random_number");
    const string        str_vlevel       = params_test.get_string("verbose_level");
 
    const bool   do_check        = params_test.is_set("expected_result");
    const double expected_result = do_check ? params_test.get_double("expected_result") : 0.0;
 
    const string str_gfix_type = params_gfix.get_string("gauge_fixing_type");
    //const string str_gmset_type  = params_wilson.get_string("gamma_matrix_type");
    const string str_gmset_type  = params_overlap.get_string("gamma_matrix_type");
    const string str_solver_type = params_solver.get_string("solver_type");
    const string str_source_type = params_source.get_string("source_type");
 
    const Bridge::VerboseLevel vl = vout.set_verbose_level(str_vlevel);
 
    //- print input parameters
    vout.general(vl, "  gconf_status = %s\n", str_gconf_status.c_str());
    vout.general(vl, "  gconf_read   = %s\n", str_gconf_read.c_str());
    vout.general(vl, "  readfile     = %s\n", readfile.c_str());
    vout.general(vl, "  rand_type    = %s\n", str_rand_type.c_str());
    vout.general(vl, "  seed         = %lu\n", seed);
    vout.general(vl, "  vlevel       = %s\n", str_vlevel.c_str());
    vout.general(vl, "  gfix_type    = %s\n", str_gfix_type.c_str());
    vout.general(vl, "  gmset_type   = %s\n", str_gmset_type.c_str());
    vout.general(vl, "  solver_type  = %s\n", str_solver_type.c_str());
    vout.general(vl, "  source_type  = %s\n", str_source_type.c_str());
 
    //- input parameter check
    int err = 0;
    err += ParameterCheck::non_NULL(str_gconf_status);
 
    if (err) {
      vout.crucial(vl, "Error at %s: input parameters have not been set\n", test_name.c_str());
      exit(EXIT_FAILURE);
    }
 
    if (str_solver_type == "CG") {
      vout.crucial(vl, "Error at %s: CG can not be adopted. Use CGNE,CGNR, instead.\n", test_name.c_str());
      exit(EXIT_FAILURE);
    }
 
    if ((str_gfix_type == "Coulomb") || (str_gfix_type == "Landau")) {
      if (CommonParameters::Nc() != 3) {
        vout.crucial(vl, "check skipped: Nc = 3 is needed, but Nc = %d.\n\n", CommonParameters::Nc());
        return EXIT_SKIP;
      }
    }
 
 
    RandomNumberManager::initialize(str_rand_type, seed);
 
 
    // ####  Set up a gauge configuration  ####
    Field_G U(Nvol, Ndim);
 
    if (str_gconf_status == "Continue") {
      GaugeConfig(str_gconf_read).read(U, readfile);
    } else if (str_gconf_status == "Cold_start") {
      GaugeConfig("Unit").read(U);
    } else if (str_gconf_status == "Hot_start") {
      GaugeConfig("Random").read(U);
    } else {
      vout.crucial(vl, "Error at %s: unsupported gconf status \"%s\"\n", test_name.c_str(), str_gconf_status.c_str());
      exit(EXIT_FAILURE);
    }
 
 
    // ####  Gauge fixing  ####
    {
      Field_G                 Ufix(Nvol, Ndim);
      unique_ptr<GaugeFixing> gfix(GaugeFixing::New(str_gfix_type, params_gfix));
 
      gfix->fix(Ufix, U);
      copy(U, Ufix);
    }
 
 
    // ####  object setup  ####
    unique_ptr<GammaMatrixSet> gmset(GammaMatrixSet::New(str_gmset_type));
 
    // unique_ptr<Fopr> fopr_w(Fopr::New("Wilson", params_wilson));
    // fopr_w->set_config(&U);
 
    //-  with low-mode subtraction
    // int Nsbt = 0;
    // std::vector<double> TDa;
    // std::vector<Field>  vk;
    // calc_lowmodes(params_irlanczos, Nsbt, TDa, vk, fopr_w);
 
    // unique_ptr<Fopr> fopr_overlap(Fopr::New("Overlap", fopr_w.get(), params_overlap));
    unique_ptr<Fopr> fopr_overlap(Fopr::New("Overlap", params_overlap));
    fopr_overlap->set_config(&U);
    // fopr_overlap->set_lowmodes(Nsbt, &TDa, &vk);
 
    unique_ptr<Solver> solver(Solver::New(str_solver_type, fopr_overlap.get(), params_solver));
 
    unique_ptr<Source> source(Source::New(str_source_type, params_source));
 
    Corr2pt_4spinor corr(gmset.get(), params_all.lookup("Corr2pt_4spinor"));
 
    Timer timer(test_name);
 
 
    // ####  Execution main part  ####
    timer.start();
 
    std::vector<Field_F> sq(Nc * Nd);
    for (int i_cd = 0; i_cd < Nc * Nd; ++i_cd) {
      sq[i_cd].set(0.0);
    }
 
    vout.general(vl, "\n");
    vout.general(vl, "Solving quark propagator:\n");
    vout.general(vl, "  color spin   Nconv      diff           diff2\n");
 
    int Nin = fopr_overlap->field_nin();
    int Nex = fopr_overlap->field_nex();
 
    Field b(Nin, Nvol, Nex);
    Field y(Nin, Nvol, Nex);
 
#pragma omp parallel
    {
      for (int ispin = 0; ispin < Nd; ++ispin) {
        for (int icolor = 0; icolor < Nc; ++icolor) {
          int icd = icolor + Nc * ispin;
 
          source->set(b, icd);
 
          int    Nconv;
          double diff;
          fopr_overlap->set_mode("D");
          solver->solve(sq[icd], b, Nconv, diff);
 
          fopr_overlap->set_mode("D");
          fopr_overlap->mult(y, sq[icd]);
          axpy(y, -1.0, b); // y -= b;
          double diff2 = y.norm2() / b.norm2();
 
          vout.general(vl, "   %2d   %2d   %6d   %12.4e   %12.4e\n",
                       icolor, ispin, Nconv, diff, diff2);
        }
      }
    }
 
    //- meson correlators
    vout.general(vl, "\n");
    vout.general(vl, "2-point correlator:\n");
 
    const double result = corr.meson_all(sq, sq);
 
 
    timer.report();
 
    RandomNumberManager::finalize();
 
 
    if (do_check) {
      return Test::verify(result, expected_result);
    } else {
      vout.detailed(vl, "check skipped: expected_result not set.\n\n");
      return EXIT_SKIP;
    }
  }
} // namespace Test_Spectrum_Overlap