Debugging smeared HMC

lib/qcd/hmc/HmcRunner.h

@@ -94,7 +94,7 @@ public:
     // Smearing policy
     std::cout << GridLogMessage << " Creating the Stout class\n";
     double rho = 0.1; // smearing parameter
-    int Nsmear = 3;   // number of smearing levels
+    int Nsmear = 1;   // number of smearing levels
     Smear_Stout<Gimpl> Stout(rho);
     std::cout << GridLogMessage << " Creating the SmearedConfiguration class\n";
     SmearedConfiguration<Gimpl> SmearingPolicy(UGrid, Nsmear, Stout);
@@ -144,7 +144,7 @@ public:
 
     // Attach the gauge field to the smearing Policy and create the fill the smeared set
     // notice that the unit configuration is singular in this procedure
-    std::cout << GridLogMessage << " Filling the smeared set\n";
+    std::cout << GridLogMessage << "Filling the smeared set\n";
     SmearingPolicy.set_GaugeField(U);
     
     HybridMonteCarlo<GaugeField,IntegratorType>  HMC(HMCpar, MDynamics,sRNG,pRNG,U); 

lib/qcd/hmc/integrators/Integrator.h

@@ -115,10 +115,12 @@ namespace Grid{
       void update_P(GaugeField &Mom,GaugeField&U, int level,double ep){
 	for(int a=0; a<as[level].actions.size(); ++a){
 	  GaugeField force(U._grid);
-	  as[level].actions.at(a)->deriv(U,force); // deriv should not include Ta
+	  GaugeField& Us = Smearer.get_U(as[level].actions.at(a)->is_smeared);
+	  as[level].actions.at(a)->deriv(Us,force); // deriv should not include Ta
 	  std::cout<<GridLogIntegrator<< "Smearing (on/off): "<<as[level].actions.at(a)->is_smeared <<std::endl;
 	  if (as[level].actions.at(a)->is_smeared) Smearer.smeared_force(force);
 	  force = Ta(force);
+	  std::cout<<GridLogIntegrator<< "Force average: "<< norm2(force)/(U._grid->gSites()) <<std::endl;
 	  Mom = Mom - force*ep;
 	}
       }

lib/qcd/smearing/APEsmearing.h

@@ -35,6 +35,7 @@ namespace Grid {
       Smear_APE():rho(set_rho(1.0)){}
       ~Smear_APE(){}
 
+      ///////////////////////////////////////////////////////////////////////////////
       void smear(GaugeField& u_smr, const GaugeField& U)const{
 	GridBase *grid = U._grid;
 	double d_rho;
@@ -45,16 +46,19 @@ namespace Grid {
 	for(int mu=0; mu<Nd; ++mu){
 	  Cup = zero;
 	  for(int nu=0; nu<Nd; ++nu){
+	    if (nu != mu) {
 	      d_rho = rho[mu + Nd * nu];
 	      // get the staple in direction mu, nu
-	    WL.Staple(tmp_stpl, U, mu, nu);  //nb staple conventions of IroIro and Grid differ by a dag
+	      WL.Staple(tmp_stpl, U, mu, nu);  //nb staple conventions of IroIro and Grid differ by a dagger
 	      Cup += tmp_stpl*d_rho;
 	    }
+	  }
 	  // save the Cup link-field on the u_smr gauge-field
 	  pokeLorentz(u_smr, adj(Cup), mu); // u_smr[mu] = Cup^dag
 	}
       }
 
+      ////////////////////////////////////////////////////////////////////////////////
       void derivative(GaugeField& SigmaTerm,
 		      const GaugeField& iLambda,
 		      const GaugeField& U)const{

lib/qcd/smearing/GaugeConfiguration.h

@@ -48,6 +48,10 @@ namespace Grid {
 	  for(int smearLvl = 0; smearLvl < smearingLevels; ++smearLvl){
 	    StoutSmearing.smear(SmearedSet[smearLvl],previous_u);
 	    previous_u = SmearedSet[smearLvl];
+
+	    RealD impl_plaq = WilsonLoops<Gimpl>::avgPlaquette(previous_u);
+	    std::cout<< GridLogDebug << "[SmearedConfiguration] Plaq: " << impl_plaq<< std::endl;
+
 	  }
 
 	}
@@ -73,14 +77,14 @@ namespace Grid {
 	  pokeLorentz(SigmaK, SigmaKPrime_mu*e_iQ + adj(Cmu)*iLambda_mu, mu);
 	  pokeLorentz(iLambda, iLambda_mu, mu);
 	}
-	StoutSmearing.derivative(SigmaK, iLambda, GaugeK);
+	StoutSmearing.derivative(SigmaK, iLambda, GaugeK);// derivative of SmearBase
 	return SigmaK;
       }
       /*! @brief Returns smeared configuration at level 'Level' */
       const GaugeField& get_smeared_conf(int Level) const{
 	return SmearedSet[Level];
       }
-      
+      //====================================================================
       void set_iLambda(GaugeLinkField& iLambda, 
 		       GaugeLinkField& e_iQ,
 		       const GaugeLinkField& iQ, 
@@ -117,8 +121,8 @@ namespace Grid {
 	w2 = w * w;
 	cosw = cos(w);
 	
-	emiu = toComplex(cos(u)) - timesI(toComplex(u));
-	e2iu = toComplex(cos(2.0*u)) + timesI(toComplex(2.0*u));
+	emiu = toComplex(cos(u)) - timesI(toComplex(sin(u)));
+	e2iu = toComplex(cos(2.0*u)) + timesI(toComplex(sin(2.0*u)));
 
 	r01 = (toComplex(2.0*u) + timesI(toComplex(2.0*(u2-w2)))) * e2iu
 	  + emiu * (toComplex(16.0*u*cosw + 2.0*u*(3.0*u2+w2)*xi0) +
@@ -174,7 +178,7 @@ namespace Grid {
 	
 		
       }
-      
+     //==================================================================== 
     public:
       GaugeField* ThinLinks;      /*!< @brief Pointer to the thin 
 				    links configuration */
@@ -201,12 +205,14 @@ namespace Grid {
       // attach the smeared routines to the thin links U and fill the smeared set
       void set_GaugeField(GaugeField& U){ fill_smearedSet(U);}
       
+      //====================================================================
       void smeared_force(GaugeField& SigmaTilde) const{
 	if (smearingLevels > 0){
-	  GaugeField force = SigmaTilde;//actually = U*SigmaTilde, check this for Grid
+	  GaugeField force = SigmaTilde;//actually = U*SigmaTilde
 	  GaugeLinkField tmp_mu(SigmaTilde._grid);
 	  
 	  for (int mu = 0; mu < Nd; mu++){
+	    // to get SigmaTilde
 	    tmp_mu = adj(peekLorentz(SmearedSet[smearingLevels-1], mu)) * peekLorentz(force,mu);
 	    pokeLorentz(force, tmp_mu, mu);
 	  }
@@ -221,6 +227,7 @@ namespace Grid {
 	  }
 	}// if smearingLevels = 0 do nothing
       }
+      //====================================================================
 
       
       GaugeField& get_SmearedU(){ 
@@ -230,10 +237,22 @@ namespace Grid {
       GaugeField& get_U(bool smeared=false) { 
 	// get the config, thin links by default
 	if (smeared){
-	  if (smearingLevels) return get_SmearedU();
-	  else                return *ThinLinks;
+	  if (smearingLevels){ 
+	    RealD impl_plaq = WilsonLoops<Gimpl>::avgPlaquette(SmearedSet[smearingLevels-1]);
+	    std::cout<< GridLogDebug << "getting U Plaq: " << impl_plaq<< std::endl;
+	    return get_SmearedU();
+	    
 	  }
-	else return *ThinLinks;
+	  else  {
+	    RealD impl_plaq = WilsonLoops<Gimpl>::avgPlaquette(*ThinLinks);
+	    std::cout<< GridLogDebug << "getting Thin Plaq: " << impl_plaq<< std::endl;
+              return *ThinLinks;
+	  }
+	}
+	else{
+	    RealD impl_plaq = WilsonLoops<Gimpl>::avgPlaquette(*ThinLinks);
+	    std::cout<< GridLogDebug << "getting Thin Plaq: " << impl_plaq<< std::endl;
+	    return *ThinLinks;}
       }
       
     };

lib/qcd/smearing/StoutSmearing.h

@@ -33,7 +33,7 @@ namespace Grid {
       
       void smear(GaugeField& u_smr,const GaugeField& U) const{
 	GaugeField C(U._grid);
-	GaugeLinkField tmp(U._grid), q_mu(U._grid), Umu(U._grid);
+	GaugeLinkField tmp(U._grid), iq_mu(U._grid), Umu(U._grid);
 	
 	std::cout<< GridLogDebug << "Stout smearing started\n";
 	
@@ -42,8 +42,8 @@ namespace Grid {
 	for (int mu = 0; mu<Nd; mu++){
 	  tmp = peekLorentz(C,mu);
 	  Umu = peekLorentz(U,mu);
-	  q_mu = Ta(tmp * adj(Umu)); // q_mu = Ta(Omega_mu)
-	  exponentiate_iQ(tmp, q_mu);  
+	  iq_mu = Ta(tmp * adj(Umu)); // iq_mu = Ta(Omega_mu) to match the signs with the paper
+	  exponentiate_iQ(tmp, iq_mu);  
 	  pokeLorentz(u_smr, tmp*Umu, mu);// u_smr = exp(iQ_mu)*U_mu
 	}
 	
@@ -68,6 +68,10 @@ namespace Grid {
 
 	// only one Lorentz direction at a time 
 
+	// notice that it actually computes
+	// exp ( input matrix )  
+	// the i sign is coming from outside
+	// input matrix is anti-hermitian NOT hermitian
 
 	GridBase *grid = iQ._grid;
 	GaugeLinkField unity(grid);
@@ -94,6 +98,7 @@ namespace Grid {
 	GridBase *grid = u._grid;
 	LatticeReal c0(grid), c1(grid), tmp(grid), c0max(grid), theta(grid);
 
+	// sign in c0 from the conventions on the Ta
 	c0    = - toReal(imag(trace(iQ3))) * one_over_three;
 	c1    = - toReal(real(trace(iQ2))) * one_over_two;
 	tmp   = c1 * one_over_three;
@@ -101,7 +106,7 @@ namespace Grid {
 	
 	theta = acos(c0/c0max);
 	u = sqrt(tmp) * cos( theta * one_over_three);
-	w = sqrt(c1) * sin ( theta * one_over_three);
+	w = sqrt(c1)  * sin( theta * one_over_three);
       }
 
       void set_fj(LatticeComplex& f0, LatticeComplex& f1, LatticeComplex& f2,

lib/qcd/utils/WilsonLoops.h

@@ -216,17 +216,15 @@ namespace Grid {
       //////////////////////////////////////////////////
       static void StapleUpper(GaugeMat &staple,const GaugeLorentz &Umu,int mu, int nu){
 
+	staple = zero;
+
+	if(nu != mu) {
 	  GridBase *grid = Umu._grid;
 	  
 	  std::vector<GaugeMat> U(4,grid);
 	  for(int d=0;d<Nd;d++){
 	    U[d] = PeekIndex<LorentzIndex>(Umu,d);
 	  }
-	staple = zero;
-
-
-    
-	if(nu != mu) {
 	  
 	  // mu
 	  // ^

tests/Test_hmc_EOWilsonFermionGauge.cc

@@ -66,7 +66,7 @@ public:
 
     TwoFlavourEvenOddPseudoFermionAction<ImplPolicy> Nf2(FermOp,CG,CG);
 
-    Nf2.is_smeared=false;
+    Nf2.is_smeared=true;
     
     //Collect actions
     ActionLevel<LatticeGaugeField> Level1(1);