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// Rapid Optimization Library (ROL) Package
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#ifndef ROL_KRYLOVFACTORY_H
#define ROL_KRYLOVFACTORY_H
#include "ROL_Types.hpp"
#include "Teuchos_ParameterList.hpp"
#include "Teuchos_RCP.hpp"
#include "ROL_Krylov.hpp"
#include "ROL_GMRES.hpp"
#include "ROL_ConjugateGradients.hpp"
#include "ROL_ConjugateResiduals.hpp"
namespace ROL {
template<class Real> // Why is this forward declaration required but not for CG/CR?
class GMRES;
template<class Real>
inline Teuchos::RCP<Krylov<Real> > KrylovFactory( Teuchos::ParameterList &parlist ) {
Real em4(1e-4), em2(1e-2);
EKrylov ekv = StringToEKrylov(
parlist.sublist("General").sublist("Krylov").get("Type","Conjugate Gradients"));
Real absTol = parlist.sublist("General").sublist("Krylov").get("Absolute Tolerance", em4);
Real relTol = parlist.sublist("General").sublist("Krylov").get("Relative Tolerance", em2);
int maxit = parlist.sublist("General").sublist("Krylov").get("Iteration Limit", 20);
bool inexact = parlist.sublist("General").get("Inexact Hessian-Times-A-Vector",false);
switch(ekv) {
case KRYLOV_CR:
return Teuchos::rcp( new ConjugateResiduals<Real>(absTol,relTol,maxit,inexact) );
case KRYLOV_CG:
return Teuchos::rcp( new ConjugateGradients<Real>(absTol,relTol,maxit,inexact) );
case KRYLOV_GMRES:
return Teuchos::rcp( new GMRES<Real>(parlist) );
default: return Teuchos::null;
}
}
}
#endif
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