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Adef2 implemented and working in an HDCG like context
This commit is contained in:
Peter Boyle
parent
6c3ade5d89
commit
0ec0de97e6
@ -33,15 +33,6 @@ Author: Peter Boyle <paboyle@ph.ed.ac.uk>
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* Script A = SolverMatrix
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* Script P = Preconditioner
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*
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* Deflation methods considered
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* -- Solve P A x = P b [ like Luscher ]
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* DEF-1 M P A x = M P b [i.e. left precon]
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* DEF-2 P^T M A x = P^T M b
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* ADEF-1 Preconditioner = M P + Q [ Q + M + M A Q]
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* ADEF-2 Preconditioner = P^T M + Q
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* BNN Preconditioner = P^T M P + Q
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* BNN2 Preconditioner = M P + P^TM +Q - M P A M
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*
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* Implement ADEF-2
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*
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* Vstart = P^Tx + Qb
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@ -49,45 +40,157 @@ Author: Peter Boyle <paboyle@ph.ed.ac.uk>
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* M2=M3=1
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* Vout = x
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*/
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NAMESPACE_BEGIN(Grid);
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// abstract base
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template<class Field, class CoarseField>
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template<class Field, class CoarseField, class Aggregation>
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class TwoLevelFlexiblePcg : public LinearFunction<Field>
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{
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public:
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int verbose;
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RealD Tolerance;
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Integer MaxIterations;
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const int mmax = 5;
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const int mmax = 1;
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GridBase *grid;
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GridBase *coarsegrid;
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LinearOperatorBase<Field> *_Linop
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OperatorFunction<Field> *_Smoother,
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LinearFunction<CoarseField> *_CoarseSolver;
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// Fine operator, Smoother, CoarseSolver
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LinearOperatorBase<Field> &_FineLinop;
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LinearFunction<Field> &_Smoother;
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LinearFunction<CoarseField> &_CoarseSolver;
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LinearFunction<CoarseField> &_CoarseSolverPrecise;
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// Need somthing that knows how to get from Coarse to fine and back again
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// Need something that knows how to get from Coarse to fine and back again
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// void ProjectToSubspace(CoarseVector &CoarseVec,const FineField &FineVec){
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// void PromoteFromSubspace(const CoarseVector &CoarseVec,FineField &FineVec){
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Aggregation &_Aggregates;
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// more most opertor functions
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TwoLevelFlexiblePcg(RealD tol,
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Integer maxit,
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LinearOperatorBase<Field> *Linop,
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LinearOperatorBase<Field> *SmootherLinop,
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OperatorFunction<Field> *Smoother,
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OperatorFunction<CoarseField> CoarseLinop
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Integer maxit,
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LinearOperatorBase<Field> &FineLinop,
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LinearFunction<Field> &Smoother,
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LinearFunction<CoarseField> &CoarseSolver,
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LinearFunction<CoarseField> &CoarseSolverPrecise,
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Aggregation &Aggregates
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) :
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Tolerance(tol),
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MaxIterations(maxit),
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_Linop(Linop),
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_PreconditionerLinop(PrecLinop),
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_Preconditioner(Preconditioner)
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{
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verbose=0;
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_FineLinop(FineLinop),
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_Smoother(Smoother),
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_CoarseSolver(CoarseSolver),
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_CoarseSolverPrecise(CoarseSolverPrecise),
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_Aggregates(Aggregates)
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{
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coarsegrid = Aggregates.CoarseGrid;
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grid = Aggregates.FineGrid;
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};
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void Inflexible(Field &src,Field &psi)
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{
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Field resid(grid);
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RealD f;
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RealD rtzp,rtz,a,d,b;
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RealD rptzp;
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Field x(grid);
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Field p(grid);
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Field z(grid);
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Field tmp(grid);
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Field mmp(grid);
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Field r (grid);
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Field mu (grid);
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Field rp (grid);
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//Initial residual computation & set up
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RealD guess = norm2(psi);
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double tn;
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//////////////////////////
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// x0 = Vstart -- possibly modify guess
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//////////////////////////
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x=Zero();
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Vstart(x,src);
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// r0 = b -A x0
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_FineLinop.HermOp(x,mmp);
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axpy(r, -1.0, mmp, src); // Recomputes r=src-x0
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rp=r;
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//////////////////////////////////
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// Compute z = M1 x
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//////////////////////////////////
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PcgM1(r,z);
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rtzp =real(innerProduct(r,z));
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///////////////////////////////////////
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// Except Def2, M2 is trivial
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///////////////////////////////////////
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p=z;
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RealD ssq = norm2(src);
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RealD rsq = ssq*Tolerance*Tolerance;
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std::cout<<GridLogMessage<<"HDCG: k=0 residual "<<rtzp<<" target rsq "<<rsq<<" ssq "<<ssq<<std::endl;
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for (int k=1;k<=MaxIterations;k++){
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rtz=rtzp;
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d= PcgM3(p,mmp);
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a = rtz/d;
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axpy(x,a,p,x);
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RealD rn = axpy_norm(r,-a,mmp,r);
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PcgM1(r,z);
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rtzp =real(innerProduct(r,z));
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int ipcg=1; // almost free inexact preconditioned CG
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if (ipcg) {
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rptzp =real(innerProduct(rp,z));
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} else {
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rptzp =0;
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}
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b = (rtzp-rptzp)/rtz;
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PcgM2(z,mu); // ADEF-2 this is identity. Axpy possible to eliminate
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axpy(p,b,p,mu); // mu = A r
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RealD rrn=sqrt(rn/ssq);
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RealD rtn=sqrt(rtz/ssq);
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std::cout<<GridLogMessage<<"HDCG: Pcg k= "<<k<<" residual = "<<rrn<<std::endl;
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if ( ipcg ) {
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axpy(rp,0.0,r,r);
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}
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// Stopping condition
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if ( rn <= rsq ) {
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std::cout<<GridLogMessage<<"HDCG: Pcg converged in "<<k<<" iterations"<<std::endl;;
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_FineLinop.HermOp(x,mmp);
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axpy(tmp,-1.0,src,mmp);
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RealD mmpnorm = sqrt(norm2(mmp));
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RealD psinorm = sqrt(norm2(x));
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RealD srcnorm = sqrt(norm2(src));
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RealD tmpnorm = sqrt(norm2(tmp));
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RealD true_residual = tmpnorm/srcnorm;
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std::cout<<GridLogMessage<<"HDCG: true residual is "<<true_residual
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<<" solution "<<psinorm<<" source "<<srcnorm<<std::endl;
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return;
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}
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}
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std::cout << "HDCG: Pcg not converged"<<std::endl;
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return ;
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}
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// The Pcg routine is common to all, but the various matrices differ from derived
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// implementation to derived implmentation
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void operator() (const Field &src, Field &psi){
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void operator() (const Field &src, Field &psi){
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psi.Checkerboard() = src.Checkerboard();
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@ -108,7 +211,7 @@ class TwoLevelFlexiblePcg : public LinearFunction<Field>
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std::vector<Field> mmp(mmax,grid);
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std::vector<RealD> pAp(mmax);
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Field x (grid); x = psi;
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Field x (grid);
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Field z (grid);
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Field tmp(grid);
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Field r (grid);
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@ -117,25 +220,23 @@ class TwoLevelFlexiblePcg : public LinearFunction<Field>
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//////////////////////////
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// x0 = Vstart -- possibly modify guess
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//////////////////////////
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x=src;
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x=Zero();
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Vstart(x,src);
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// r0 = b -A x0
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HermOp(x,mmp); // Shouldn't this be something else?
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_FineLinop.HermOp(x,mmp[0]); // Fine operator
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axpy (r, -1.0,mmp[0], src); // Recomputes r=src-Ax0
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//////////////////////////////////
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// Compute z = M1 x
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// Compute z = M1 r
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//////////////////////////////////
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M1(r,z,tmp,mp,SmootherMirs);
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PcgM1(r,z);
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rtzp =real(innerProduct(r,z));
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///////////////////////////////////////
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// Solve for Mss mu = P A z and set p = z-mu
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// Def2: p = 1 - Q Az = Pright z
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// Other algos M2 is trivial
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///////////////////////////////////////
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M2(z,p[0]);
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PcgM2(z,p[0]);
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for (int k=0;k<=MaxIterations;k++){
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@ -143,26 +244,38 @@ class TwoLevelFlexiblePcg : public LinearFunction<Field>
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int peri_kp = (k+1) % mmax;
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rtz=rtzp;
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d= M3(p[peri_k],mp,mmp[peri_k],tmp);
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d= PcgM3(p[peri_k],mmp[peri_k]);
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a = rtz/d;
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// Memorise this
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pAp[peri_k] = d;
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std::cout << GridLogMessage << " pCG d "<< d<<std::endl;
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axpy(x,a,p[peri_k],x);
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// std::cout << GridLogMessage << " pCG x "<< norm2(x)<<std::endl;
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RealD rn = axpy_norm(r,-a,mmp[peri_k],r);
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std::cout << GridLogMessage << " pCG rn "<< rn<<std::endl;
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// Compute z = M x
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M1(r,z,tmp,mp);
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PcgM1(r,z);
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// std::cout << GridLogMessage << " pCG z "<< norm2(z)<<std::endl;
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rtzp =real(innerProduct(r,z));
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std::cout << GridLogMessage << " pCG rtzp "<<rtzp<<std::endl;
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// std::cout << GridLogMessage << " pCG r "<<norm2(r)<<std::endl;
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M2(z,mu); // ADEF-2 this is identity. Axpy possible to eliminate
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PcgM2(z,mu); // ADEF-2 this is identity. Axpy possible to eliminate
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p[peri_kp]=p[peri_k];
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// std::cout << GridLogMessage << " pCG mu "<<norm2(mu)<<std::endl;
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p[peri_kp]=mu;
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// Standard search direction p -> z + b p ; b =
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// std::cout << GridLogMessage << " pCG p[peri_kp] "<<norm2(p[peri_kp])<<std::endl;
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// Standard search direction p -> z + b p
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b = (rtzp)/rtz;
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std::cout << GridLogMessage << " pCG b "<< b<<std::endl;
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int northog;
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// northog = (peri_kp==0)?1:peri_kp; // This is the fCG(mmax) algorithm
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@ -174,6 +287,7 @@ class TwoLevelFlexiblePcg : public LinearFunction<Field>
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RealD beta = -pbApk/pAp[peri_back];
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axpy(p[peri_kp],beta,p[peri_back],p[peri_kp]);
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}
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// std::cout << GridLogMessage << " pCG p[peri_kp] orthog "<< norm2(p[peri_kp])<<std::endl;
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RealD rrn=sqrt(rn/ssq);
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std::cout<<GridLogMessage<<"TwoLevelfPcg: k= "<<k<<" residual = "<<rrn<<std::endl;
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@ -181,7 +295,7 @@ class TwoLevelFlexiblePcg : public LinearFunction<Field>
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// Stopping condition
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if ( rn <= rsq ) {
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HermOp(x,mmp); // Shouldn't this be something else?
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_FineLinop.HermOp(x,mmp[0]); // Shouldn't this be something else?
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axpy(tmp,-1.0,src,mmp[0]);
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RealD psinorm = sqrt(norm2(x));
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@ -190,7 +304,7 @@ class TwoLevelFlexiblePcg : public LinearFunction<Field>
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RealD true_residual = tmpnorm/srcnorm;
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std::cout<<GridLogMessage<<"TwoLevelfPcg: true residual is "<<true_residual<<std::endl;
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std::cout<<GridLogMessage<<"TwoLevelfPcg: target residual was"<<Tolerance<<std::endl;
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return k;
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return;
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}
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}
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// Non-convergence
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@ -199,52 +313,42 @@ class TwoLevelFlexiblePcg : public LinearFunction<Field>
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public:
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virtual void M(Field & in,Field & out,Field & tmp) {
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}
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virtual void M1(Field & in, Field & out) {// the smoother
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virtual void PcgM1(Field & in, Field & out)
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{
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// [PTM+Q] in = [1 - Q A] M in + Q in = Min + Q [ in -A Min]
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Field tmp(grid);
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Field Min(grid);
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CoarseField PleftProj(coarsegrid);
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CoarseField PleftMss_proj(coarsegrid);
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PcgM(in,Min); // Smoother call
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_Smoother(in,Min);
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HermOp(Min,out);
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_FineLinop.HermOp(Min,out);
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axpy(tmp,-1.0,out,in); // tmp = in - A Min
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ProjectToSubspace(tmp,PleftProj);
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ApplyInverse(PleftProj,PleftMss_proj); // Ass^{-1} [in - A Min]_s
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PromoteFromSubspace(PleftMss_proj,tmp);// tmp = Q[in - A Min]
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_Aggregates.ProjectToSubspace(PleftProj,tmp);
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_CoarseSolver(PleftProj,PleftMss_proj); // Ass^{-1} [in - A Min]_s
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_Aggregates.PromoteFromSubspace(PleftMss_proj,tmp);// tmp = Q[in - A Min]
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axpy(out,1.0,Min,tmp); // Min+tmp
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}
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virtual void M2(const Field & in, Field & out) {
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virtual void PcgM2(const Field & in, Field & out) {
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out=in;
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// Must override for Def2 only
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// case PcgDef2:
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// Pright(in,out);
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// break;
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}
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virtual RealD M3(const Field & p, Field & mmp){
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double d,dd;
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HermOpAndNorm(p,mmp,d,dd);
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virtual RealD PcgM3(const Field & p, Field & mmp){
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RealD dd;
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_FineLinop.HermOp(p,mmp);
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ComplexD dot = innerProduct(p,mmp);
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dd=real(dot);
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return dd;
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// Must override for Def1 only
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// case PcgDef1:
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// d=linop_d->Mprec(p,mmp,tmp,0,1);// Dag no
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// linop_d->Mprec(mmp,mp,tmp,1);// Dag yes
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// Pleft(mp,mmp);
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// d=real(linop_d->inner(p,mmp));
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}
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virtual void VstartDef2(Field & xconst Field & src){
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//case PcgDef2:
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//case PcgAdef2:
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//case PcgAdef2f:
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//case PcgV11f:
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virtual void Vstart(Field & x,const Field & src)
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{
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///////////////////////////////////
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// Choose x_0 such that
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// x_0 = guess + (A_ss^inv) r_s = guess + Ass_inv [src -Aguess]
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@ -258,140 +362,22 @@ class TwoLevelFlexiblePcg : public LinearFunction<Field>
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///////////////////////////////////
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Field r(grid);
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Field mmp(grid);
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HermOp(x,mmp);
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axpy (r, -1.0, mmp, src); // r_{-1} = src - A x
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ProjectToSubspace(r,PleftProj);
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ApplyInverseCG(PleftProj,PleftMss_proj); // Ass^{-1} r_s
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PromoteFromSubspace(PleftMss_proj,mmp);
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x=x+mmp;
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CoarseField PleftProj(coarsegrid);
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CoarseField PleftMss_proj(coarsegrid);
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}
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_Aggregates.ProjectToSubspace(PleftProj,src);
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_CoarseSolverPrecise(PleftProj,PleftMss_proj); // Ass^{-1} r_s
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_Aggregates.PromoteFromSubspace(PleftMss_proj,x);
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virtual void Vstart(Field & x,const Field & src){
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return;
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}
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/////////////////////////////////////////////////////////////////////
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// Only Def1 has non-trivial Vout. Override in Def1
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// Only Def1 has non-trivial Vout.
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/////////////////////////////////////////////////////////////////////
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virtual void Vout (Field & in, Field & out,Field & src){
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out = in;
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//case PcgDef1:
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// //Qb + PT x
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// ProjectToSubspace(src,PleftProj);
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// ApplyInverse(PleftProj,PleftMss_proj); // Ass^{-1} r_s
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// PromoteFromSubspace(PleftMss_proj,tmp);
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//
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// Pright(in,out);
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//
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// linop_d->axpy(out,tmp,out,1.0);
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// break;
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}
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};
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////////////////////////////////////////////////////////////////////////////////////////////////
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// Pright and Pleft are common to all implementations
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////////////////////////////////////////////////////////////////////////////////////////////////
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virtual void Pright(Field & in,Field & out){
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// P_R = [ 1 0 ]
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// [ -Mss^-1 Msb 0 ]
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Field in_sbar(grid);
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ProjectToSubspace(in,PleftProj);
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PromoteFromSubspace(PleftProj,out);
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axpy(in_sbar,-1.0,out,in); // in_sbar = in - in_s
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HermOp(in_sbar,out);
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ProjectToSubspace(out,PleftProj); // Mssbar in_sbar (project)
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ApplyInverse (PleftProj,PleftMss_proj); // Mss^{-1} Mssbar
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PromoteFromSubspace(PleftMss_proj,out); //
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axpy(out,-1.0,out,in_sbar); // in_sbar - Mss^{-1} Mssbar in_sbar
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}
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virtual void Pleft (Field & in,Field & out){
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// P_L = [ 1 -Mbs Mss^-1]
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// [ 0 0 ]
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Field in_sbar(grid);
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Field tmp2(grid);
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Field Mtmp(grid);
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||||
ProjectToSubspace(in,PleftProj);
|
||||
PromoteFromSubspace(PleftProj,out);
|
||||
axpy(in_sbar,-1.0,out,in); // in_sbar = in - in_s
|
||||
|
||||
ApplyInverse(PleftProj,PleftMss_proj); // Mss^{-1} in_s
|
||||
PromoteFromSubspace(PleftMss_proj,out);
|
||||
|
||||
HermOp(out,Mtmp);
|
||||
|
||||
ProjectToSubspace(Mtmp,PleftProj); // Msbar s Mss^{-1}
|
||||
PromoteFromSubspace(PleftProj,tmp2);
|
||||
|
||||
axpy(out,-1.0,tmp2,Mtmp);
|
||||
axpy(out,-1.0,out,in_sbar); // in_sbar - Msbars Mss^{-1} in_s
|
||||
}
|
||||
}
|
||||
|
||||
template<class Field>
|
||||
class TwoLevelFlexiblePcgADef2 : public TwoLevelFlexiblePcg<Field> {
|
||||
public:
|
||||
virtual void M(Field & in,Field & out,Field & tmp){
|
||||
|
||||
}
|
||||
virtual void M1(Field & in, Field & out,Field & tmp,Field & mp){
|
||||
|
||||
}
|
||||
virtual void M2(Field & in, Field & out){
|
||||
|
||||
}
|
||||
virtual RealD M3(Field & p, Field & mp,Field & mmp, Field & tmp){
|
||||
|
||||
}
|
||||
virtual void Vstart(Field & in, Field & src, Field & r, Field & mp, Field & mmp, Field & tmp){
|
||||
|
||||
}
|
||||
}
|
||||
/*
|
||||
template<class Field>
|
||||
class TwoLevelFlexiblePcgAD : public TwoLevelFlexiblePcg<Field> {
|
||||
public:
|
||||
virtual void M(Field & in,Field & out,Field & tmp);
|
||||
virtual void M1(Field & in, Field & out,Field & tmp,Field & mp);
|
||||
virtual void M2(Field & in, Field & out);
|
||||
virtual RealD M3(Field & p, Field & mp,Field & mmp, Field & tmp);
|
||||
virtual void Vstart(Field & in, Field & src, Field & r, Field & mp, Field & mmp, Field & tmp);
|
||||
}
|
||||
|
||||
template<class Field>
|
||||
class TwoLevelFlexiblePcgDef1 : public TwoLevelFlexiblePcg<Field> {
|
||||
public:
|
||||
virtual void M(Field & in,Field & out,Field & tmp);
|
||||
virtual void M1(Field & in, Field & out,Field & tmp,Field & mp);
|
||||
virtual void M2(Field & in, Field & out);
|
||||
virtual RealD M3(Field & p, Field & mp,Field & mmp, Field & tmp);
|
||||
virtual void Vstart(Field & in, Field & src, Field & r, Field & mp, Field & mmp, Field & tmp);
|
||||
virtual void Vout (Field & in, Field & out,Field & src,Field & tmp);
|
||||
}
|
||||
|
||||
template<class Field>
|
||||
class TwoLevelFlexiblePcgDef2 : public TwoLevelFlexiblePcg<Field> {
|
||||
public:
|
||||
virtual void M(Field & in,Field & out,Field & tmp);
|
||||
virtual void M1(Field & in, Field & out,Field & tmp,Field & mp);
|
||||
virtual void M2(Field & in, Field & out);
|
||||
virtual RealD M3(Field & p, Field & mp,Field & mmp, Field & tmp);
|
||||
virtual void Vstart(Field & in, Field & src, Field & r, Field & mp, Field & mmp, Field & tmp);
|
||||
}
|
||||
|
||||
template<class Field>
|
||||
class TwoLevelFlexiblePcgV11: public TwoLevelFlexiblePcg<Field> {
|
||||
public:
|
||||
virtual void M(Field & in,Field & out,Field & tmp);
|
||||
virtual void M1(Field & in, Field & out,Field & tmp,Field & mp);
|
||||
virtual void M2(Field & in, Field & out);
|
||||
virtual RealD M3(Field & p, Field & mp,Field & mmp, Field & tmp);
|
||||
virtual void Vstart(Field & in, Field & src, Field & r, Field & mp, Field & mmp, Field & tmp);
|
||||
}
|
||||
*/
|
||||
NAMESPACE_END(Grid);
|
||||
#endif
|
||||
|
||||
Loading…
Reference in New Issue
Block a user