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Pcg

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This commit is contained in:
Peter Boyle 2020-09-03 21:55:05 -04:00
parent b7b164ea24
commit 98f7b3d298
1 changed files with 101 additions and 169 deletions
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270
Grid/algorithms/iterative/AdefGeneric.h
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@ -1,4 +1,4 @@
/*************************************************************************************
/*************************************************************************************
Grid physics library, www.github.com/paboyle/Grid
@ -28,6 +28,7 @@ Author: Peter Boyle <paboyle@ph.ed.ac.uk>
#ifndef GRID_ALGORITHMS_ITERATIVE_GENERIC_PCG
#define GRID_ALGORITHMS_ITERATIVE_GENERIC_PCG
NAMESPACE_BEGIN(Grid);
/*
* Compared to Tang-2009: P=Pleft. P^T = PRight Q=MssInv.
* Script A = SolverMatrix
@ -50,53 +51,54 @@ Author: Peter Boyle <paboyle@ph.ed.ac.uk>
* Vout = x
*/
// abstract base
template<class Field, class CoarseField>
template<class Field, class CoarseField, class Aggregates>
class TwoLevelFlexiblePcg : public LinearFunction<Field>
{
public:
int verbose;
RealD Tolerance;
Integer MaxIterations;
const int mmax = 5;
GridBase *grid;
GridBase *coarsegrid;
const int mmax = 4;
GridBase *FineGrid;
GridBase *CoarseGrid;
LinearOperatorBase<Field> *_Linop
OperatorFunction<Field> *_Smoother,
LinearFunction<CoarseField> *_CoarseSolver;
// Need somthing that knows how to get from Coarse to fine and back again
LinearOperatorBase<Field> &_Linop;
LinearFunction<Field> &_Smoother;
LinearFunction<CoarseField> &_CoarseSolver;
Aggregates &_Aggregates;
// more most opertor functions
TwoLevelFlexiblePcg(RealD tol,
Integer maxit,
LinearOperatorBase<Field> *Linop,
LinearOperatorBase<Field> *SmootherLinop,
OperatorFunction<Field> *Smoother,
OperatorFunction<CoarseField> CoarseLinop
) :
Tolerance(tol),
MaxIterations(maxit),
_Linop(Linop),
_PreconditionerLinop(PrecLinop),
_Preconditioner(Preconditioner)
Integer maxit,
LinearOperatorBase<Field> *Linop,
LinearFunction<Field> *Smoother,
LinearFunction<CoarseField> *CoarseSolver,
Aggregates *AggP
) :
Tolerance(tol),
MaxIterations(maxit),
_Linop(*Linop),
_Smoother(*Smoother),
_CoarseSolver(*CoarseSolver),
_Aggregates(*AggP)
{
CoarseGrid=_Aggregates.CoarseGrid;
FineGrid=_Aggregates.FineGrid;
verbose=0;
};
// The Pcg routine is common to all, but the various matrices differ from derived
// implementation to derived implmentation
void operator() (const Field &src, Field &psi){
void operator() (const Field &src, Field &psi){
psi.Checkerboard() = src.Checkerboard();
grid = src.Grid();
RealD f;
RealD rtzp,rtz,a,d,b;
RealD rptzp;
RealD tn;
// RealD rptzp;
// RealD tn;
RealD guess = norm2(psi);
RealD ssq = norm2(src);
RealD rsq = ssq*Tolerance*Tolerance;
@ -104,15 +106,15 @@ class TwoLevelFlexiblePcg : public LinearFunction<Field>
/////////////////////////////
// Set up history vectors
/////////////////////////////
std::vector<Field> p (mmax,grid);
std::vector<Field> mmp(mmax,grid);
std::vector<Field> p (mmax,FineGrid);
std::vector<Field> mmp(mmax,FineGrid);
std::vector<RealD> pAp(mmax);
Field x (grid); x = psi;
Field z (grid);
Field tmp(grid);
Field r (grid);
Field mu (grid);
Field x (FineGrid); x = psi;
Field z (FineGrid);
Field tmp(FineGrid);
Field r (FineGrid);
Field mu (FineGrid);
//////////////////////////
// x0 = Vstart -- possibly modify guess
@ -121,13 +123,13 @@ class TwoLevelFlexiblePcg : public LinearFunction<Field>
Vstart(x,src);
// r0 = b -A x0
HermOp(x,mmp); // Shouldn't this be something else?
_Linop.HermOp(x,mmp[0]); // Shouldn't this be something else?
axpy (r, -1.0,mmp[0], src); // Recomputes r=src-Ax0
//////////////////////////////////
// Compute z = M1 x
//////////////////////////////////
M1(r,z,tmp,mp,SmootherMirs);
M1(r,z);
rtzp =real(innerProduct(r,z));
///////////////////////////////////////
@ -143,7 +145,7 @@ class TwoLevelFlexiblePcg : public LinearFunction<Field>
int peri_kp = (k+1) % mmax;
rtz=rtzp;
d= M3(p[peri_k],mp,mmp[peri_k],tmp);
d= M3(p[peri_k],mmp[peri_k]);
a = rtz/d;
// Memorise this
@ -153,13 +155,13 @@ class TwoLevelFlexiblePcg : public LinearFunction<Field>
RealD rn = axpy_norm(r,-a,mmp[peri_k],r);
// Compute z = M x
M1(r,z,tmp,mp);
M1(r,z);
rtzp =real(innerProduct(r,z));
M2(z,mu); // ADEF-2 this is identity. Axpy possible to eliminate
p[peri_kp]=p[peri_k];
p[peri_kp]=mu;
// Standard search direction p -> z + b p ; b =
b = (rtzp)/rtz;
@ -181,7 +183,7 @@ class TwoLevelFlexiblePcg : public LinearFunction<Field>
// Stopping condition
if ( rn <= rsq ) {
HermOp(x,mmp); // Shouldn't this be something else?
_Linop.HermOp(x,mmp[0]); // Shouldn't this be something else?
axpy(tmp,-1.0,src,mmp[0]);
RealD psinorm = sqrt(norm2(x));
@ -190,7 +192,8 @@ class TwoLevelFlexiblePcg : public LinearFunction<Field>
RealD true_residual = tmpnorm/srcnorm;
std::cout<<GridLogMessage<<"TwoLevelfPcg: true residual is "<<true_residual<<std::endl;
std::cout<<GridLogMessage<<"TwoLevelfPcg: target residual was"<<Tolerance<<std::endl;
return k;
return;
}
}
// Non-convergence
@ -199,48 +202,40 @@ class TwoLevelFlexiblePcg : public LinearFunction<Field>
public:
virtual void M(Field & in,Field & out,Field & tmp) {
}
virtual void M1(Field & in, Field & out) {// the smoother
virtual void M1(Field & in, Field & out)
{// the smoother
// [PTM+Q] in = [1 - Q A] M in + Q in = Min + Q [ in -A Min]
Field tmp(grid);
Field Min(grid);
Field tmp(FineGrid);
Field Min(FineGrid);
PcgM(in,Min); // Smoother call
CoarseField PleftProj(CoarseGrid);
CoarseField PleftMss_proj(CoarseGrid);
HermOp(Min,out);
_Smoother(in,Min); // Smoother call
_Linop.HermOp(Min,out);
axpy(tmp,-1.0,out,in); // tmp = in - A Min
ProjectToSubspace(tmp,PleftProj);
ApplyInverse(PleftProj,PleftMss_proj); // Ass^{-1} [in - A Min]_s
PromoteFromSubspace(PleftMss_proj,tmp);// tmp = Q[in - A Min]
_Aggregates.ProjectToSubspace(PleftProj,tmp);
_CoarseSolver(PleftProj,PleftMss_proj); // Ass^{-1} [in - A Min]_s
_Aggregates.PromoteFromSubspace(PleftMss_proj,tmp);// tmp = Q[in - A Min]
axpy(out,1.0,Min,tmp); // Min+tmp
}
virtual void M2(const Field & in, Field & out) {
virtual void M2(const Field & in, Field & out)
{
out=in;
// Must override for Def2 only
// case PcgDef2:
// Pright(in,out);
// break;
}
virtual RealD M3(const Field & p, Field & mmp){
virtual RealD M3(const Field & p, Field & mmp)
{
double d,dd;
HermOpAndNorm(p,mmp,d,dd);
_Linop.HermOpAndNorm(p,mmp,d,dd);
return dd;
// Must override for Def1 only
// case PcgDef1:
// d=linop_d->Mprec(p,mmp,tmp,0,1);// Dag no
// linop_d->Mprec(mmp,mp,tmp,1);// Dag yes
// Pleft(mp,mmp);
// d=real(linop_d->inner(p,mmp));
}
virtual void VstartDef2(Field & xconst Field & src){
virtual void Vstart(Field & x,const Field & src)
{
//case PcgDef2:
//case PcgAdef2:
//case PcgAdef2f:
@ -256,142 +251,79 @@ class TwoLevelFlexiblePcg : public LinearFunction<Field>
// = src_s - (A guess)_s - src_s + (A guess)_s
// = 0
///////////////////////////////////
Field r(grid);
Field mmp(grid);
Field r(FineGrid);
Field mmp(FineGrid);
HermOp(x,mmp);
CoarseField PleftProj(CoarseGrid);
CoarseField PleftMss_proj(CoarseGrid);
_Linop.HermOp(x,mmp);
axpy (r, -1.0, mmp, src); // r_{-1} = src - A x
ProjectToSubspace(r,PleftProj);
ApplyInverseCG(PleftProj,PleftMss_proj); // Ass^{-1} r_s
PromoteFromSubspace(PleftMss_proj,mmp);
_Aggregates.ProjectToSubspace(PleftProj,r);
_CoarseSolver(PleftProj,PleftMss_proj); // Ass^{-1} r_s
_Aggregates.PromoteFromSubspace(PleftMss_proj,mmp);
x=x+mmp;
}
virtual void Vstart(Field & x,const Field & src){
return;
}
/////////////////////////////////////////////////////////////////////
// Only Def1 has non-trivial Vout. Override in Def1
/////////////////////////////////////////////////////////////////////
virtual void Vout (Field & in, Field & out,Field & src){
out = in;
//case PcgDef1:
// //Qb + PT x
// ProjectToSubspace(src,PleftProj);
// ApplyInverse(PleftProj,PleftMss_proj); // Ass^{-1} r_s
// PromoteFromSubspace(PleftMss_proj,tmp);
//
// Pright(in,out);
//
// linop_d->axpy(out,tmp,out,1.0);
// break;
}
////////////////////////////////////////////////////////////////////////////////////////////////
// Pright and Pleft are common to all implementations
////////////////////////////////////////////////////////////////////////////////////////////////
virtual void Pright(Field & in,Field & out){
virtual void Pright(Field & in,Field & out)
{
// P_R = [ 1 0 ]
// [ -Mss^-1 Msb 0 ]
Field in_sbar(grid);
Field in_sbar(FineGrid);
ProjectToSubspace(in,PleftProj);
PromoteFromSubspace(PleftProj,out);
CoarseField PleftProj(CoarseGrid);
CoarseField PleftMss_proj(CoarseGrid);
_Aggregates.ProjectToSubspace(PleftProj,in);
_Aggregates.PromoteFromSubspace(PleftProj,out);
axpy(in_sbar,-1.0,out,in); // in_sbar = in - in_s
HermOp(in_sbar,out);
ProjectToSubspace(out,PleftProj); // Mssbar in_sbar (project)
_Linop.HermOp(in_sbar,out);
_Aggregates.ProjectToSubspace(PleftProj,out); // Mssbar in_sbar (project)
ApplyInverse (PleftProj,PleftMss_proj); // Mss^{-1} Mssbar
PromoteFromSubspace(PleftMss_proj,out); //
_CoarseSolver(PleftProj,PleftMss_proj); // Mss^{-1} Mssbar
_Aggregates.PromoteFromSubspace(PleftMss_proj,out); //
axpy(out,-1.0,out,in_sbar); // in_sbar - Mss^{-1} Mssbar in_sbar
}
virtual void Pleft (Field & in,Field & out){
virtual void Pleft (Field & in,Field & out)
{
// P_L = [ 1 -Mbs Mss^-1]
// [ 0 0 ]
Field in_sbar(grid);
Field tmp2(grid);
Field Mtmp(grid);
Field in_sbar(FineGrid);
Field tmp2(FineGrid);
Field Mtmp(FineGrid);
ProjectToSubspace(in,PleftProj);
PromoteFromSubspace(PleftProj,out);
CoarseField PleftProj(CoarseGrid);
CoarseField PleftMss_proj(CoarseGrid);
_Aggregates.ProjectToSubspace(PleftProj,in);
_Aggregates.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);
_CoarseSolver(PleftProj,PleftMss_proj); // Mss^{-1} in_s
_Aggregates.PromoteFromSubspace(PleftMss_proj,out);
HermOp(out,Mtmp);
_Linop.HermOp(out,Mtmp);
ProjectToSubspace(Mtmp,PleftProj); // Msbar s Mss^{-1}
PromoteFromSubspace(PleftProj,tmp2);
_Aggregates.ProjectToSubspace(PleftProj,Mtmp); // Msbar s Mss^{-1}
_Aggregates.PromoteFromSubspace(PleftProj,tmp2);
axpy(out,-1.0,tmp2,Mtmp);
axpy(out,-1.0,out,in_sbar); // in_sbar - Msbars Mss^{-1} in_s
}
}
};
NAMESPACE_END(Grid);
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);
}
*/
#endif