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https://github.com/paboyle/Grid.git
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49b0af2c95
Audited the code conventions (again) with the CPS momentum denominator and added anti periodic in time to the Test_mobius_force.cc and tested the Test_dwf_gpforce. Promoted thesee to test full HMC hamiltonian, tr P^2/2 + phidag MdagM phi with the same pdot and Udot as audited in the Integrator.h etc... With full comments and sources for factors.
240 lines
8.8 KiB
C++
240 lines
8.8 KiB
C++
/*************************************************************************************
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Grid physics library, www.github.com/paboyle/Grid
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Source file: ./tests/Test_dwf_force.cc
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Copyright (C) 2015
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Author: Peter Boyle <paboyle@ph.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 directory
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*************************************************************************************/
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/* END LEGAL */
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#include <Grid/Grid.h>
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using namespace std;
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using namespace Grid;
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;
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int main (int argc, char ** argv)
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{
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Grid_init(&argc,&argv);
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Coordinate latt_size = GridDefaultLatt();
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Coordinate simd_layout = GridDefaultSimd(Nd,vComplex::Nsimd());
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Coordinate mpi_layout = GridDefaultMpi();
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const int Ls=8;
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GridCartesian * UGrid = SpaceTimeGrid::makeFourDimGrid(GridDefaultLatt(), GridDefaultSimd(Nd,vComplex::Nsimd()),GridDefaultMpi());
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GridRedBlackCartesian * UrbGrid = SpaceTimeGrid::makeFourDimRedBlackGrid(UGrid);
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GridCartesian * FGrid = SpaceTimeGrid::makeFiveDimGrid(Ls,UGrid);
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GridRedBlackCartesian * FrbGrid = SpaceTimeGrid::makeFiveDimRedBlackGrid(Ls,UGrid);
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std::vector<int> seeds4({1,2,3,4});
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std::vector<int> seeds5({5,6,7,8});
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GridParallelRNG RNG5(FGrid); RNG5.SeedFixedIntegers(seeds5);
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GridParallelRNG RNG4(UGrid); RNG4.SeedFixedIntegers(seeds4);
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int threads = GridThread::GetThreads();
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std::cout<<GridLogMessage << "Grid is setup to use "<<threads<<" threads"<<std::endl;
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LatticeFermion phi (FGrid); gaussian(RNG5,phi);
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LatticeFermion Mphi (FGrid);
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LatticeFermion MphiPrime (FGrid);
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LatticeGaugeField U(UGrid);
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SU<Nc>::HotConfiguration(RNG4,U);
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////////////////////////////////////
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// Unmodified matrix element
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////////////////////////////////////
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RealD mass=0.01;
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RealD M5=1.8;
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RealD b=0.5;
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RealD c=0.5;
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WilsonImplParams p;
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p.boundary_phases[0] = 1.0;
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p.boundary_phases[1] = 1.0;
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p.boundary_phases[2] = 1.0;
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p.boundary_phases[3] =- 1.0;
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MobiusFermionR Ddwf(U,*FGrid,*FrbGrid,*UGrid,*UrbGrid,mass,M5,b,c,p);
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Ddwf.M (phi,Mphi);
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ComplexD S = innerProduct(Mphi,Mphi); // pdag MdagM p
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// get the deriv of phidag MdagM phi with respect to "U"
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LatticeGaugeField UdSdU(UGrid);
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LatticeGaugeField tmp(UGrid);
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Ddwf.MDeriv(tmp , Mphi, phi,DaggerNo ); UdSdU=tmp;
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Ddwf.MDeriv(tmp , phi, Mphi,DaggerYes ); UdSdU=(UdSdU+tmp);
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// *****************************************************************************************
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// *** There is a funny negative sign in all derivatives. This is - UdSdU. ***
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// *** ***
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// *** Deriv in both Wilson gauge action and the TwoFlavour.h seems to miss a minus sign ***
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// *** UdSdU is negated relative to what I think - call what is returned mUdSdU, ***
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// *** and insert minus sign ***
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// *****************************************************************************************
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UdSdU = - UdSdU ; // Follow sign convention of actions in Grid. Seems crazy.
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LatticeFermion Ftmp (FGrid);
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////////////////////////////////////
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// Modify the gauge field a little
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////////////////////////////////////
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RealD dt = 0.001;
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RealD Hmom = 0.0;
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RealD Hmomprime = 0.0;
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LatticeColourMatrix mommu(UGrid);
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LatticeColourMatrix mUdSdUmu(UGrid);
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LatticeGaugeField mom(UGrid);
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LatticeGaugeField Uprime(UGrid);
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for(int mu=0;mu<Nd;mu++){
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SU<Nc>::GaussianFundamentalLieAlgebraMatrix(RNG4, mommu); // Traceless antihermitian momentum; gaussian in lie alg
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PokeIndex<LorentzIndex>(mom,mommu,mu);
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// Momentum Hamiltonian is - trace(p^2)/HMC_MOM_DENOMINATOR
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//
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// Integrator.h: RealD H = - FieldImplementation::FieldSquareNorm(P)/HMC_MOMENTUM_DENOMINATOR; // - trace (P*P)/denom // GaugeImplTypes.h: Hloc += trace(Pmu * Pmu);
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// Sign comes from a sneaky multiply by "i" in GaussianFundemantalLie algebra
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// P is i P^a_\mu T^a, not Pa Ta
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//
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// Integrator.h: H = Hmom + sum S(action)
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Hmom -= real(sum(trace(mommu*mommu)))/ HMC_MOMENTUM_DENOMINATOR;
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// fourth order exponential approx
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autoView( U_v , U, CpuRead);
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autoView( mom_v, mom, CpuRead);
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autoView(Uprime_v, Uprime, CpuWrite);
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thread_foreach(i,mom_v,{
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Uprime_v[i](mu) = U_v[i](mu)
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+ mom_v[i](mu)*U_v[i](mu)*dt
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+ mom_v[i](mu) *mom_v[i](mu) *U_v[i](mu)*(dt*dt/2.0)
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+ mom_v[i](mu) *mom_v[i](mu) *mom_v[i](mu) *U_v[i](mu)*(dt*dt*dt/6.0)
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+ mom_v[i](mu) *mom_v[i](mu) *mom_v[i](mu) *mom_v[i](mu) *U_v[i](mu)*(dt*dt*dt*dt/24.0)
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+ mom_v[i](mu) *mom_v[i](mu) *mom_v[i](mu) *mom_v[i](mu) *mom_v[i](mu) *U_v[i](mu)*(dt*dt*dt*dt*dt/120.0)
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+ mom_v[i](mu) *mom_v[i](mu) *mom_v[i](mu) *mom_v[i](mu) *mom_v[i](mu) *mom_v[i](mu) *U_v[i](mu)*(dt*dt*dt*dt*dt*dt/720.0)
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;
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});
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}
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std::cout << GridLogMessage <<"Initial mom hamiltonian is "<< Hmom <<std::endl;
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Ddwf.ImportGauge(Uprime);
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Ddwf.M (phi,MphiPrime);
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ComplexD Sprime = innerProduct(MphiPrime ,MphiPrime);
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//////////////////////////////////////////////
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// Use derivative to estimate dS
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//////////////////////////////////////////////
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LatticeComplex dS(UGrid); dS = Zero();
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LatticeComplex dSmom(UGrid); dSmom = Zero();
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LatticeComplex dSmom2(UGrid); dSmom2 = Zero();
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for(int mu=0;mu<Nd;mu++){
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mommu = PeekIndex<LorentzIndex>(UdSdU,mu);
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mommu=Ta(mommu);
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PokeIndex<LorentzIndex>(UdSdU,mommu,mu);
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}
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for(int mu=0;mu<Nd;mu++){
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mUdSdUmu= PeekIndex<LorentzIndex>(UdSdU,mu);
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mommu = PeekIndex<LorentzIndex>(mom,mu);
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//
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// Derive HMC eom:
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//
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// Sdot = - 2 trace( p p^dot ) / D - trace( p [ mUdSdU - h.c. ] ) = 0
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//
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//
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// Sdot = 0 = - 2 trace( p p^dot ) / D - 2 trace( p Ta( mUdSdU ) = 0
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//
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// EOM:
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//
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// pdot = - D Ta( mUdSdU ) -- source of sign is the "funny sign" above
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//
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// dSqcd_dt = - 2.0*trace(mommu* Ta(mUdSdU) )*dt -- i.e. mUdSdU with adjoint term -> force has a 2x implicit
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//
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// dH_mom/dt = - 2 trace (p pdot)/Denom
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//
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// dH_tot / dt = 0 <= pdot = - Denom * mUdSdU
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//
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// dH_mom/dt = 2 trace (p mUdSdU )
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//
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// True Momentum delta H has a dt^2 piece
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//
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// dSmom = [ trace mom*mom - trace ( (mom-Denom*f*dt)(mom-Denom*f*dt) ) ] / Denom
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// = 2*trace(mom*f) dt - Denom*dt*dt * trace(f*f).
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// = dSmom + dSmom2
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//
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dS = dS - 2.0*trace(mommu*mUdSdUmu)*dt; // U and Udagger derivs hence 2x.
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dSmom = dSmom + 2.0*trace(mommu*mUdSdUmu) * dt; // this 2.0 coms from derivative of p^2
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dSmom2 = dSmom2 - trace(mUdSdUmu*mUdSdUmu) * dt*dt* HMC_MOMENTUM_DENOMINATOR; // Remnant
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mommu = mommu - mUdSdUmu * dt* HMC_MOMENTUM_DENOMINATOR;;
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Hmomprime -= real(sum(trace(mommu*mommu))) / HMC_MOMENTUM_DENOMINATOR;
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}
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ComplexD dSpred = sum(dS);
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ComplexD dSm = sum(dSmom);
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ComplexD dSm2 = sum(dSmom2);
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std::cout << GridLogMessage <<"dSm "<< dSm<<std::endl;
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std::cout << GridLogMessage <<"dSm2 "<< dSm2<<std::endl;
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std::cout << GridLogMessage <<"Initial mom hamiltonian is "<< Hmom <<std::endl;
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std::cout << GridLogMessage <<"Final mom hamiltonian is "<< Hmomprime <<std::endl;
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std::cout << GridLogMessage <<"Delta mom hamiltonian is "<< Hmomprime-Hmom <<std::endl;
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std::cout << GridLogMessage <<"predict Delta mom hamiltonian is "<< dSm+dSm2 <<std::endl;
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std::cout << GridLogMessage << "Initial S "<<S<<std::endl;
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std::cout << GridLogMessage << "Final S "<<Sprime<<std::endl;
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std::cout << GridLogMessage << "Delta S "<<Sprime-S<<std::endl;
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std::cout << GridLogMessage << "predict delta S"<< dSpred <<std::endl;
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std::cout << GridLogMessage << "defect "<< Sprime-S-dSpred <<std::endl;
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std::cout << GridLogMessage << "Total dS "<< Hmomprime - Hmom + Sprime - S <<std::endl;
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std::cout << GridLogMessage << "dS - dt^2 term "<< Hmomprime - Hmom + Sprime - S - dSm2 <<std::endl;
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assert( fabs(real(Sprime-S-dSpred)) < 1.0 ) ;
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std::cout<< GridLogMessage << "Done" <<std::endl;
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Grid_finalize();
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}
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