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66d001ec9e
Modified the Wilson flow adaptive smearing step size update to implement the original Ramos definition of the distance, where previously it used the norm of a difference which scales with the volume and so would choose too coarse or too fine steps depending on the volume. This is based on Chulwoo's code. Added a test comparing adaptive (with tuneable tolerance) to iterative Wilson flow smearing on a random gauge configuration.
122 lines
3.7 KiB
C++
122 lines
3.7 KiB
C++
/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: ./lib/qcd/modules/topological_charge.h
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Copyright (C) 2017
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Author: Guido Cossu <guido.cossu@ed.ac.uk>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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See the full license in the file "LICENSE" in the top level distribution
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directory
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*************************************************************************************/
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/* END LEGAL */
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#pragma once
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NAMESPACE_BEGIN(Grid);
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struct TopologySmearingParameters : Serializable {
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GRID_SERIALIZABLE_CLASS_MEMBERS(TopologySmearingParameters,
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int, meas_interval,
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float, init_step_size,
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float, maxTau,
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float, tolerance);
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TopologySmearingParameters(float ss = 0.0f, int mi = 0, float mT = 0.0f, float tol = 1e-4):
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init_step_size(ss), meas_interval(mi), maxTau(mT), tolerance(tol){}
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template < class ReaderClass >
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TopologySmearingParameters(Reader<ReaderClass>& Reader){
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read(Reader, "Smearing", *this);
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}
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};
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struct TopologyObsParameters : Serializable {
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GRID_SERIALIZABLE_CLASS_MEMBERS(TopologyObsParameters,
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int, interval,
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bool, do_smearing,
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TopologySmearingParameters, Smearing);
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TopologyObsParameters(int interval = 1, bool smearing = false):
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interval(interval), Smearing(smearing){}
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template <class ReaderClass >
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TopologyObsParameters(Reader<ReaderClass>& Reader){
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read(Reader, "TopologyMeasurement", *this);
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}
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};
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// this is only defined for a gauge theory
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template <class Impl>
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class TopologicalCharge : public HmcObservable<typename Impl::Field> {
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TopologyObsParameters Pars;
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public:
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// here forces the Impl to be of gauge fields
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// if not the compiler will complain
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INHERIT_GIMPL_TYPES(Impl);
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// necessary for HmcObservable compatibility
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typedef typename Impl::Field Field;
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TopologicalCharge(int interval = 1, bool do_smearing = false):
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Pars(interval, do_smearing){}
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TopologicalCharge(TopologyObsParameters P):Pars(P){
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std::cout << GridLogDebug << "Creating TopologicalCharge " << std::endl;
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}
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void TrajectoryComplete(int traj,
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Field &U,
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GridSerialRNG &sRNG,
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GridParallelRNG &pRNG) {
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if (traj%Pars.interval == 0){
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// Smearing
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Field Usmear = U;
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int def_prec = std::cout.precision();
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if (Pars.do_smearing){
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// using wilson flow by default here
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WilsonFlowAdaptive<PeriodicGimplR> WF(Pars.Smearing.init_step_size, Pars.Smearing.maxTau, Pars.Smearing.tolerance, Pars.Smearing.meas_interval);
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WF.smear(Usmear, U);
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Real T0 = WF.energyDensityPlaquette(Pars.Smearing.maxTau, Usmear);
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std::cout << GridLogMessage << std::setprecision(std::numeric_limits<Real>::digits10 + 1)
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<< "T0 : [ " << traj << " ] "<< T0 << std::endl;
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}
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Real q = WilsonLoops<Impl>::TopologicalCharge(Usmear);
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std::cout << GridLogMessage
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<< std::setprecision(std::numeric_limits<Real>::digits10 + 1)
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<< "Topological Charge: [ " << traj << " ] "<< q << std::endl;
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std::cout.precision(def_prec);
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}
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}
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};
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NAMESPACE_END(Grid);
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