test_Spectrum_4ptFunction.cpp

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#include "test.h"

#include "Field/shiftField_lex.h"

#include "Fopr/fopr_Smeared.h"

#include "IO/gaugeConfig.h"

#include "Measurements/Fermion/corr2pt_4spinor.h"
#include "Measurements/Fermion/corr4pt_4spinor.h"
#include "Measurements/Fermion/fprop_Standard_lex.h"
#include "Measurements/Fermion/source.h"
#include "Measurements/Gauge/gaugeFixing.h"

#include "Tools/filename.h"
#include "Tools/gammaMatrixSet.h"
#include "Tools/randomNumberManager.h"

//====================================================================

/*
  Description of Parameters

    Test_Spectrum:
      gauge_config_status: { Continue, Cold_start, or Hot_start }
      gauge_config_type_input: { file and I/O type }
      config_filename_input: { filename of gauge config file }

      number_of_valence_quarks: { number of valence quarks, N_quark }

      verbose_level:  { verbose level }
      expected_result:  { result value }

    Quark_{1,2,... N_quark }:
      Fopr:  { Fopr type and parameters }
      Solver: { Solver type and parameters }
      Source: { Source type and parameters }

    Projection:
    Smear:
    Director_Smear:
      { parameters for smearing }

    GaugeFixing: { gauge fixing type and parameters }
 */

namespace Test_Spectrum {
  const std::string test_name = "Spectrum.Hadron4ptFunction";

  //- test-private parameters
  namespace {
    // const std::string filename_input  = "test_Spectrum_Clover_Hadron4ptFunction.yaml";
  }

  //- prototype declaration
  int hadron_4ptFunction(const std::string&);

  //- hadron_4ptFunction for various fermions
  int hadron_4ptFunction_Clover()
  {
    return hadron_4ptFunction("test_Spectrum_Clover_Hadron4ptFunction.yaml");
  }


#ifdef USE_TESTMANAGER_AUTOREGISTER
  namespace {
#if defined(USE_GROUP_SU2)
    // Nc=2 is not available.
#else
    static const bool is_registered_Clover = TestManager::RegisterTest(
      "Spectrum.Clover.Hadron4ptFunction",
      hadron_4ptFunction_Clover
      );
#endif
  }
#endif

  //====================================================================
  int hadron_4ptFunction(const std::string& filename_input)
  {
    // ####  parameter setup  ####
    const int Nc   = CommonParameters::Nc();
    const int Nd   = CommonParameters::Nd();
    const int Ndim = CommonParameters::Ndim();
    const int Nvol = CommonParameters::Nvol();

    const Parameters params_all  = ParameterManager::read(filename_input);
    const Parameters params_test = params_all.lookup("Test_Spectrum");

    const int N_quark = params_test.get_int("number_of_valence_quarks");

    const std::string   str_gconf_status = params_test.get_string("gauge_config_status");
    const std::string   str_gconf_read   = params_test.get_string("gauge_config_type_input");
    const std::string   readfile         = params_test.get_string("config_filename_input");
    const vector<int>   Nshift_origin    = params_test.get_int_vector("shift_origin");
    const std::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 std::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 std::string str_gfix_type  = params_all.lookup("GaugeFixing").get_string("gauge_fixing_type");
    const std::string str_proj_type  = params_all.lookup("Projection").get_string("projection_type");
    const std::string str_smear_type = params_all.lookup("Smear").get_string("smear_type");
    const int Nsmear                 = params_all.lookup("Director_Smear").get_int("number_of_smearing");

    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());
    for (int mu = 0; mu < Ndim; ++mu) {
      vout.general(vl, "  shift_origin[%d] = %d\n", mu, Nshift_origin[mu]);
    }
    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, "  proj_type    = %s\n", str_proj_type.c_str());
    vout.general(vl, "  smear_type   = %s\n", str_smear_type.c_str());

    vector<Parameters> params_quark;

    for (int iq = 0; iq < N_quark; ++iq) {
      std::string qlabel = Filename("Quark_{id}").format(iq + 1);
      params_quark.push_back(params_all.lookup(qlabel));
    }

    // NB. all str_gmset_type are supposed to be the same.
    std::string str_gmset_type = params_quark[0].lookup("Fopr").get_string("gamma_matrix_type");
    vout.general(vl, "  gmset_type  = %s\n", str_gmset_type.c_str());


    for (int iq = 0; iq < N_quark; ++iq) {
      vout.general(vl, "  Quark_%d:\n", iq + 1);
      vout.general(vl, "    solver_type = %s\n",
                   params_quark[iq].lookup("Solver").get_string("solver_type").c_str());
      vout.general(vl, "    source_type = %s\n",
                   params_quark[iq].lookup("Source").get_string("source_type").c_str());

      vector<int> source_position = params_quark[iq].lookup("Source").get_int_vector("source_position");
      for (int mu = 0; mu < Ndim; ++mu) {
        vout.general(vl, "    source_position[%d] = %d\n", mu, source_position[mu]);
      }
    }
    vout.general(vl, "\n");


    //- 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);
    }

    for (int iq = 0; iq < N_quark; ++iq) {
      std::string str_solver_type = params_quark[iq].lookup("Solver").get_string("solver_type");

      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 (N_quark < 2) {
      vout.crucial(vl, "Error at %s: N_quark = %d, which must be > 1\n", test_name.c_str(), N_quark);
      exit(EXIT_FAILURE);
    }

    if ( (Nsmear > 0) && (str_proj_type == "Stout_SU3") ) {
      if (CommonParameters::Nc() != 3) {
        vout.crucial(vl, "check skipped: Nc = 3 is needed, but Nc = %d.\n\n", CommonParameters::Nc());
        return EXIT_SKIP;
      }
    }

    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  ####
    unique_ptr<Field_G> U(new Field_G(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);
    }

    //- shift the origin of U
    {
      ShiftField_lex shift;
      for (int i_dir = 0; i_dir < Ndim; ++i_dir) {
        for (int i_shift = 0; i_shift < Nshift_origin[i_dir]; ++i_shift) {
          unique_ptr<Field_G> Ushift(new Field_G(Nvol, Ndim));
          shift.backward(*Ushift, *U, i_dir);
          copy(*U, *Ushift);
        }
      }
    }

    //- smear U
    if (Nsmear > 0) {
      unique_ptr<Projection> proj(Projection::New(str_proj_type));
      proj->set_parameters(params_all.lookup("Projection"));

      unique_ptr<Smear> smear(Smear::New(str_smear_type, proj));
      smear->set_parameters(params_all.lookup("Smear"));

      const unique_ptr<Director_Smear> dr_smear(new Director_Smear(smear));
      dr_smear->set_parameters(params_all.lookup("Director_Smear"));
      dr_smear->set_config(U);

      const Field_G *Usmear = (Field_G *)dr_smear->getptr_smearedConfig(Nsmear);
      copy(*U, *Usmear);
    }

    // ####  Gauge fixing  ####
    {
      unique_ptr<Field_G> Ufix(new Field_G(Nvol, Ndim));

      const unique_ptr<GaugeFixing> gfix(GaugeFixing::New(str_gfix_type));
      gfix->set_parameters(params_all.lookup("GaugeFixing"));

      gfix->fix(*Ufix, *U);

      copy(*U, *Ufix);
    }

    // ####  object setup  #####
    unique_ptr<GammaMatrixSet> gmset(GammaMatrixSet::New(str_gmset_type));

#ifdef LIB_CPP11
    std::vector<unique_ptr<Fopr> >   fopr(N_quark);
    std::vector<unique_ptr<Solver> > solver(N_quark);
    std::vector<unique_ptr<Fprop> >  fprop_lex(N_quark);
    std::vector<unique_ptr<Source> > source(N_quark);

    for (int iq = 0; iq < N_quark; ++iq) {
      std::string str_fopr_type = params_quark[iq].lookup("Fopr").get_string("fermion_type");
      fopr[iq].reset(Fopr::New(str_fopr_type, str_gmset_type));
      fopr[iq]->set_parameters(params_quark[iq].lookup("Fopr"));
      fopr[iq]->set_config(U);

      std::string str_solver_type = params_quark[iq].lookup("Solver").get_string("solver_type");
      solver[iq].reset(Solver::New(str_solver_type, fopr[iq]));
      solver[iq]->set_parameters(params_quark[iq].lookup("Solver"));

      fprop_lex[iq].reset(new Fprop_Standard_lex(solver[iq]));

      std::string str_source_type = params_quark[iq].lookup("Source").get_string("source_type");
      source[iq].reset(Source::New(str_source_type));
      source[iq]->set_parameters(params_quark[iq].lookup("Source"));
    }
#else
    std::vector<Fopr *>   fopr(N_quark);
    std::vector<Solver *> solver(N_quark);
    std::vector<Fprop *>  fprop_lex(N_quark);
    std::vector<Source *> source(N_quark);

    for (int iq = 0; iq < N_quark; ++iq) {
      std::string str_fopr_type = params_quark[iq].lookup("Fopr").get_string("fermion_type");
      fopr[iq] = Fopr::New(str_fopr_type, str_gmset_type);
      fopr[iq]->set_parameters(params_quark[iq].lookup("Fopr"));
      fopr[iq]->set_config(U);

      std::string str_solver_type = params_quark[iq].lookup("Solver").get_string("solver_type");
      solver[iq] = Solver::New(str_solver_type, fopr[iq]);
      solver[iq]->set_parameters(params_quark[iq].lookup("Solver"));

      fprop_lex[iq] = new Fprop_Standard_lex(solver[iq]);

      std::string str_source_type = params_quark[iq].lookup("Source").get_string("source_type");
      source[iq] = Source::New(str_source_type);
      source[iq]->set_parameters(params_quark[iq].lookup("Source"));
    }
#endif

    Corr4pt_4spinor corr_4pt(gmset);
    corr_4pt.set_parameters(params_all.lookup("Corr4pt_4spinor"));

    Corr2pt_4spinor corr_2pt(gmset);
    corr_2pt.set_parameters(params_all.lookup("Corr2pt_4spinor"));

    const unique_ptr<Timer> timer(new Timer(test_name));


    // ####  Execution main part  ####
    timer->start();

    typedef std::vector<Field_F> PropagatorSet;
    std::vector<PropagatorSet> sq(N_quark);
    for (int iq = 0; iq < N_quark; ++iq) {
      sq[iq].resize(Nc * Nd);

      for (int i = 0; i < Nc * Nd; ++i) {
        sq[iq][i].set(0.0);
      }
    }


    for (int iq = 0; iq < N_quark; ++iq) {
      vout.general(vl, "Solving quark propagator, flavor = %d:\n", iq + 1);
      vout.general(vl, "  color spin   Nconv      diff           diff2\n");

      for (int ispin = 0; ispin < Nd; ++ispin) {
        for (int icolor = 0; icolor < Nc; ++icolor) {
          int idx = icolor + Nc * ispin;

          Field_F b;  // b.set(0.0);
          source[iq]->set(b, idx);

          int    Nconv;
          double diff;
          fprop_lex[iq]->invert_D(sq[iq][idx], b, Nconv, diff);

          Field_F y(b);
          fopr[iq]->set_mode("D");
          fopr[iq]->mult(y, sq[iq][idx]);  // y  = fopr[iq]->mult(sq[iq][idx]);
          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);
        }
      }

      vout.general(vl, "\n");
    }


    //- meson correlators
    std::vector<double> result(N_quark / 2);

    vout.general(vl, "4-point correlator:\n");

    //- NB. corr_4pt requires src(iq) != src(jq) due to Fierz rearrangement
    for (int iq = 0; iq < N_quark; ++iq) {
      for (int jq = iq + 1; jq < N_quark; ++jq) {
        vout.general(vl, "Flavor combination = %d, %d\n", iq + 1, jq + 1);
        result[iq] = corr_4pt.meson_all(sq[iq], sq[iq], sq[jq], sq[jq]);
        vout.general(vl, "\n");
      }
    }


    vout.general(vl, "2-point correlator:\n");

    //- case(iq_1 == iq_2)
    for (int iq = 0; iq < N_quark; ++iq) {
      vout.general(vl, "Flavor combination = %d, %d\n", iq + 1, iq + 1);
      double result_1 = corr_2pt.meson_all(sq[iq], sq[iq]);
      vout.general(vl, "\n");
    }

    //- case(iq_1 < iq_2)
    for (int iq = 0; iq < N_quark; ++iq) {
      for (int jq = iq + 1; jq < N_quark; ++jq) {
        vout.general(vl, "Flavor combination = %d, %d\n", iq + 1, jq + 1);
        double result_2 = corr_2pt.meson_all(sq[iq], sq[jq]);
        vout.general(vl, "\n");
      }
    }


    timer->report();

    RandomNumberManager::finalize();

#ifdef LIB_CPP11
    // do nothing
#else
    // tidy-up
    for (int iq = 0; iq < N_quark; ++iq) {
      delete fopr[iq];
      delete solver[iq];
      delete fprop_lex[iq];
      delete source[iq];
    }
#endif

    if (do_check) {
      return Test::verify(result[0], expected_result);
    } else {
      vout.detailed(vl, "check skipped: expected_result not set.\n\n");
      return EXIT_SKIP;
    }
  }
} // namespace Test_Spectrum