mirror of
https://github.com/paboyle/Grid.git
synced 2024-11-10 15:55:37 +00:00
253 lines
8.2 KiB
C++
253 lines
8.2 KiB
C++
/*************************************************************************************
|
|
|
|
Grid physics library, www.github.com/paboyle/Grid
|
|
|
|
Source file: ./lib/qcd/hmc/HMC.h
|
|
|
|
Copyright (C) 2015
|
|
|
|
Author: Azusa Yamaguchi <ayamaguc@staffmail.ed.ac.uk>
|
|
Author: Peter Boyle <paboyle@ph.ed.ac.uk>
|
|
Author: neo <cossu@post.kek.jp>
|
|
Author: paboyle <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 */
|
|
//--------------------------------------------------------------------
|
|
/*! @file HMC.h
|
|
* @brief Classes for Hybrid Monte Carlo update
|
|
*
|
|
* @author Guido Cossu
|
|
*/
|
|
//--------------------------------------------------------------------
|
|
#ifndef HMC_INCLUDED
|
|
#define HMC_INCLUDED
|
|
|
|
#include <string>
|
|
|
|
namespace Grid {
|
|
namespace QCD {
|
|
|
|
struct HMCparameters {
|
|
Integer StartTrajectory;
|
|
Integer Trajectories; /* @brief Number of sweeps in this run */
|
|
bool MetropolisTest;
|
|
Integer NoMetropolisUntil;
|
|
|
|
HMCparameters() {
|
|
////////////////////////////// Default values
|
|
MetropolisTest = true;
|
|
NoMetropolisUntil = 10;
|
|
StartTrajectory = 0;
|
|
Trajectories = 10;
|
|
/////////////////////////////////
|
|
}
|
|
|
|
void print_parameters() const {
|
|
std::cout << GridLogMessage << "[HMC parameters] Trajectories : " << Trajectories << "\n";
|
|
std::cout << GridLogMessage << "[HMC parameters] Start trajectory : " << StartTrajectory << "\n";
|
|
std::cout << GridLogMessage << "[HMC parameters] Metropolis test (on/off): " << std::boolalpha << MetropolisTest << "\n";
|
|
std::cout << GridLogMessage << "[HMC parameters] Thermalization trajs : " << NoMetropolisUntil << "\n";
|
|
}
|
|
|
|
};
|
|
|
|
template <class Field>
|
|
class HmcObservable {
|
|
public:
|
|
virtual void TrajectoryComplete(int traj, Field &U, GridSerialRNG &sRNG,
|
|
GridParallelRNG &pRNG) = 0;
|
|
};
|
|
|
|
// this is only defined for a gauge theory
|
|
template <class Gimpl>
|
|
class PlaquetteLogger : public HmcObservable<typename Gimpl::Field> {
|
|
private:
|
|
std::string Stem;
|
|
|
|
public:
|
|
INHERIT_GIMPL_TYPES(Gimpl);
|
|
PlaquetteLogger(std::string cf) { Stem = cf; };
|
|
|
|
void TrajectoryComplete(int traj, GaugeField &U, GridSerialRNG &sRNG,
|
|
GridParallelRNG &pRNG) {
|
|
std::string file;
|
|
{
|
|
std::ostringstream os;
|
|
os << Stem << "." << traj;
|
|
file = os.str();
|
|
}
|
|
std::ofstream of(file);
|
|
|
|
RealD peri_plaq = WilsonLoops<PeriodicGimplR>::avgPlaquette(U);
|
|
RealD peri_rect = WilsonLoops<PeriodicGimplR>::avgRectangle(U);
|
|
|
|
RealD impl_plaq = WilsonLoops<Gimpl>::avgPlaquette(U);
|
|
RealD impl_rect = WilsonLoops<Gimpl>::avgRectangle(U);
|
|
|
|
of << traj << " " << impl_plaq << " " << impl_rect << " " << peri_plaq
|
|
<< " " << peri_rect << std::endl;
|
|
std::cout << GridLogMessage << "traj"
|
|
<< " "
|
|
<< "plaq "
|
|
<< " "
|
|
<< " rect "
|
|
<< " "
|
|
<< "peri_plaq"
|
|
<< " "
|
|
<< "peri_rect" << std::endl;
|
|
std::cout << GridLogMessage << traj << " " << impl_plaq << " " << impl_rect
|
|
<< " " << peri_plaq << " " << peri_rect << std::endl;
|
|
}
|
|
};
|
|
|
|
template <class IntegratorType>
|
|
class HybridMonteCarlo {
|
|
private:
|
|
const HMCparameters Params;
|
|
|
|
typedef typename IntegratorType::Field Field;
|
|
|
|
GridSerialRNG &sRNG; // Fixme: need a RNG management strategy.
|
|
GridParallelRNG &pRNG; // Fixme: need a RNG management strategy.
|
|
Field &Ucur;
|
|
|
|
IntegratorType &TheIntegrator;
|
|
std::vector<HmcObservable<Field> *> Observables;
|
|
|
|
/////////////////////////////////////////////////////////
|
|
// Metropolis step
|
|
/////////////////////////////////////////////////////////
|
|
bool metropolis_test(const RealD DeltaH) {
|
|
RealD rn_test;
|
|
|
|
RealD prob = std::exp(-DeltaH);
|
|
|
|
random(sRNG, rn_test);
|
|
|
|
std::cout << GridLogMessage
|
|
<< "--------------------------------------------------\n";
|
|
std::cout << GridLogMessage << "exp(-dH) = " << prob
|
|
<< " Random = " << rn_test << "\n";
|
|
std::cout << GridLogMessage
|
|
<< "Acc. Probability = " << ((prob < 1.0) ? prob : 1.0) << "\n";
|
|
|
|
if ((prob > 1.0) || (rn_test <= prob)) { // accepted
|
|
std::cout << GridLogMessage << "Metropolis_test -- ACCEPTED\n";
|
|
std::cout << GridLogMessage
|
|
<< "--------------------------------------------------\n";
|
|
return true;
|
|
} else { // rejected
|
|
std::cout << GridLogMessage << "Metropolis_test -- REJECTED\n";
|
|
std::cout << GridLogMessage
|
|
<< "--------------------------------------------------\n";
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/////////////////////////////////////////////////////////
|
|
// Evolution
|
|
/////////////////////////////////////////////////////////
|
|
RealD evolve_step(Field &U) {
|
|
TheIntegrator.refresh(U, pRNG); // set U and initialize P and phi's
|
|
|
|
RealD H0 = TheIntegrator.S(U); // initial state action
|
|
|
|
std::streamsize current_precision = std::cout.precision();
|
|
std::cout.precision(17);
|
|
std::cout << GridLogMessage << "Total H before trajectory = " << H0 << "\n";
|
|
std::cout.precision(current_precision);
|
|
|
|
TheIntegrator.integrate(U);
|
|
|
|
RealD H1 = TheIntegrator.S(U); // updated state action
|
|
|
|
std::cout.precision(17);
|
|
std::cout << GridLogMessage << "Total H after trajectory = " << H1
|
|
<< " dH = " << H1 - H0 << "\n";
|
|
std::cout.precision(current_precision);
|
|
|
|
return (H1 - H0);
|
|
}
|
|
|
|
public:
|
|
/////////////////////////////////////////
|
|
// Constructor
|
|
/////////////////////////////////////////
|
|
HybridMonteCarlo(HMCparameters Pams, IntegratorType &_Int,
|
|
GridSerialRNG &_sRNG, GridParallelRNG &_pRNG, Field &_U)
|
|
: Params(Pams), TheIntegrator(_Int), sRNG(_sRNG), pRNG(_pRNG), Ucur(_U) {}
|
|
~HybridMonteCarlo(){};
|
|
|
|
void AddObservable(HmcObservable<Field> *obs) {
|
|
Observables.push_back(obs);
|
|
}
|
|
|
|
void evolve(void) {
|
|
Real DeltaH;
|
|
|
|
Field Ucopy(Ucur._grid);
|
|
|
|
Params.print_parameters();
|
|
TheIntegrator.print_parameters();
|
|
TheIntegrator.print_actions();
|
|
|
|
// Actual updates (evolve a copy Ucopy then copy back eventually)
|
|
unsigned int FinalTrajectory = Params.Trajectories + Params.NoMetropolisUntil + Params.StartTrajectory;
|
|
for (int traj = Params.StartTrajectory; traj < FinalTrajectory; ++traj) {
|
|
std::cout << GridLogMessage << "-- # Trajectory = " << traj << "\n";
|
|
if (traj < Params.StartTrajectory + Params.NoMetropolisUntil) {
|
|
std::cout << GridLogMessage << "-- Thermalization" << std::endl;
|
|
}
|
|
|
|
double t0=usecond();
|
|
Ucopy = Ucur;
|
|
|
|
DeltaH = evolve_step(Ucopy);
|
|
|
|
bool accept = true;
|
|
if (traj >= Params.StartTrajectory + Params.NoMetropolisUntil) {
|
|
accept = metropolis_test(DeltaH);
|
|
} else {
|
|
std::cout << GridLogMessage << "Skipping Metropolis test" << std::endl;
|
|
}
|
|
|
|
if (accept) {
|
|
Ucur = Ucopy;
|
|
}
|
|
double t1=usecond();
|
|
std::cout << GridLogMessage << "Total time for trajectory (s): " << (t1-t0)/1e6 << std::endl;
|
|
|
|
|
|
for (int obs = 0; obs < Observables.size(); obs++) {
|
|
std::cout << GridLogDebug << "Observables # " << obs << std::endl;
|
|
std::cout << GridLogDebug << "Observables total " << Observables.size() << std::endl;
|
|
std::cout << GridLogDebug << "Observables pointer " << Observables[obs] << std::endl;
|
|
Observables[obs]->TrajectoryComplete(traj + 1, Ucur, sRNG, pRNG);
|
|
}
|
|
std::cout << GridLogMessage << ":::::::::::::::::::::::::::::::::::::::::::" << std::endl;
|
|
}
|
|
}
|
|
};
|
|
|
|
} // QCD
|
|
} // Grid
|
|
|
|
#endif
|