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Belos::CGSingleRedIter< ScalarType, MV, OP > Class Template Reference

This class implements the preconditioned single-reduction Conjugate Gradient (CG) iteration. More...

#include <BelosCGSingleRedIter.hpp>

Inheritance diagram for Belos::CGSingleRedIter< ScalarType, MV, OP >:
Inheritance graph
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Public Types

using MVT = MultiVecTraits< ScalarType, MV >
 
using OPT = OperatorTraits< ScalarType, MV, OP >
 
using SCT = Teuchos::ScalarTraits< ScalarType >
 
using MagnitudeType = typename SCT::magnitudeType
 

Private Attributes

const Teuchos::RCP
< LinearProblem< ScalarType,
MV, OP > > 		lp_
 
const Teuchos::RCP
< OutputManager< ScalarType > > 		om_
 
const Teuchos::RCP< StatusTest
< ScalarType, MV, OP > > 		stest_
 
const Teuchos::RCP
< StatusTestGenResNorm
< ScalarType, MV, OP > > 		convTest_
 
bool initialized_
 
int iter_
 
bool foldConvergenceDetectionIntoAllreduce_
 
ScalarType rHz_
 
ScalarType rHr_
 
Teuchos::RCP< MV > R_
 
Teuchos::RCP< MV > Z_
 
Teuchos::RCP< MV > AZ_
 
Teuchos::RCP< MV > P_
 
Teuchos::RCP< MV > AP_
 
Teuchos::RCP< MV > W_
 
Teuchos::RCP< MV > S_
 
Teuchos::RCP< MV > T_
 
Teuchos::RCP< MV > U_
 
Teuchos::RCP< MV > V_
 

Constructors/Destructor

 CGSingleRedIter (const Teuchos::RCP< LinearProblem< ScalarType, MV, OP > > &problem, const Teuchos::RCP< OutputManager< ScalarType > > &printer, const Teuchos::RCP< StatusTest< ScalarType, MV, OP > > &tester, const Teuchos::RCP< StatusTestGenResNorm< ScalarType, MV, OP > > &convTester, Teuchos::ParameterList &params)
 CGSingleRedIter constructor with linear problem, solver utilities, and parameter list of solver options. More...
 
virtual ~CGSingleRedIter ()=default
 Destructor. More...
 

Solver methods

void iterate ()
 This method performs CG iterations until the status test indicates the need to stop or an error occurs (in which case, an std::exception is thrown). More...
 
void initializeCG (Teuchos::RCP< CGIterationStateBase< ScalarType, MV > > newstate, Teuchos::RCP< MV > R_0)
 Initialize the solver to an iterate, providing a complete state. More...
 
void initialize ()
 Initialize the solver with the initial vectors from the linear problem or random data. More...
 
Teuchos::RCP
< CGIterationStateBase
< ScalarType, MV > > 		getState () const
 Get the current state of the linear solver. More...
 
void setState (Teuchos::RCP< CGIterationStateBase< ScalarType, MV > > state)
 

Status methods

int getNumIters () const
 Get the current iteration count. More...
 
void resetNumIters (int iter=0)
 Reset the iteration count. More...
 
Teuchos::RCP< const MV > getNativeResiduals (std::vector< MagnitudeType > *norms) const
 Get the norms of the residuals native to the solver. More...
 
Teuchos::RCP< MV > getCurrentUpdate () const
 Get the current update to the linear system. More...
 

Accessor methods

const LinearProblem
< ScalarType, MV, OP > & 		getProblem () const
 Get a constant reference to the linear problem. More...
 
int getBlockSize () const
 Get the blocksize to be used by the iterative solver in solving this linear problem. More...
 
void setBlockSize (int blockSize)
 Set the blocksize to be used by the iterative solver in solving this linear problem. More...
 
bool isInitialized ()
 States whether the solver has been initialized or not. More...
 
void setDoCondEst (bool)
 Sets whether or not to store the diagonal for condition estimation. More...
 
Teuchos::ArrayView< MagnitudeType > getDiag ()
 Gets the diagonal for condition estimation (NOT_IMPLEMENTED) More...
 
Teuchos::ArrayView< MagnitudeType > getOffDiag ()
 Gets the off-diagonal for condition estimation (NOT_IMPLEMENTED) More...
 

Additional Inherited Members

- Public Member Functions inherited from Belos::CGIteration< ScalarType, MV, OP >
- Public Member Functions inherited from Belos::Iteration< ScalarType, MV, OP >
 Iteration ()
 Default Constructor. More...
 
virtual ~Iteration ()
 Destructor. More...
 
virtual Teuchos::RCP< const MV > getNativeResiduals (std::vector< typename Teuchos::ScalarTraits< ScalarType >::magnitudeType > *norms) const =0
 Get the residuals native to the solver. More...
 

Detailed Description

template<class ScalarType, class MV, class OP>
class Belos::CGSingleRedIter< ScalarType, MV, OP >

This class implements the preconditioned single-reduction Conjugate Gradient (CG) iteration.

Author
Heidi Thornquist

Definition at line 127 of file BelosCGSingleRedIter.hpp.

Member Typedef Documentation

template<class ScalarType , class MV , class OP >
using Belos::CGSingleRedIter< ScalarType, MV, OP >::MVT = MultiVecTraits<ScalarType, MV>

Definition at line 134 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
using Belos::CGSingleRedIter< ScalarType, MV, OP >::OPT = OperatorTraits<ScalarType, MV, OP>

Definition at line 135 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
using Belos::CGSingleRedIter< ScalarType, MV, OP >::SCT = Teuchos::ScalarTraits<ScalarType>

Definition at line 136 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
using Belos::CGSingleRedIter< ScalarType, MV, OP >::MagnitudeType = typename SCT::magnitudeType

Definition at line 137 of file BelosCGSingleRedIter.hpp.

Constructor & Destructor Documentation

template<class ScalarType , class MV , class OP >
Belos::CGSingleRedIter< ScalarType, MV, OP >::CGSingleRedIter ( const Teuchos::RCP< LinearProblem< ScalarType, MV, OP > > &  problem,
const Teuchos::RCP< OutputManager< ScalarType > > &  printer,
const Teuchos::RCP< StatusTest< ScalarType, MV, OP > > &  tester,
const Teuchos::RCP< StatusTestGenResNorm< ScalarType, MV, OP > > &  convTester,
Teuchos::ParameterList &  params 
)

CGSingleRedIter constructor with linear problem, solver utilities, and parameter list of solver options.

This constructor takes pointers required by the linear solver iteration, in addition to a parameter list of options for the linear solver.

Definition at line 354 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
virtual Belos::CGSingleRedIter< ScalarType, MV, OP >::~CGSingleRedIter ( )
virtualdefault

Destructor.

Member Function Documentation

template<class ScalarType , class MV , class OP >
void Belos::CGSingleRedIter< ScalarType, MV, OP >::iterate ( )
virtual

This method performs CG iterations until the status test indicates the need to stop or an error occurs (in which case, an std::exception is thrown).

iterate() will first determine whether the solver is initialized; if not, it will call initialize() using default arguments. After initialization, the solver performs CG iterations until the status test evaluates as Passed, at which point the method returns to the caller.

The status test is queried at the beginning of the iteration.

Implements Belos::Iteration< ScalarType, MV, OP >.

Definition at line 448 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
void Belos::CGSingleRedIter< ScalarType, MV, OP >::initializeCG ( Teuchos::RCP< CGIterationStateBase< ScalarType, MV > >  newstate,
Teuchos::RCP< MV >  R_0 
)
virtual

Initialize the solver to an iterate, providing a complete state.

The CGSingleRedIter contains a certain amount of state, consisting of the current residual, preconditioned residual, and decent direction.

initialize() gives the user the opportunity to manually set these, although only the current unpreconditioned residual is required.

Postcondition
isInitialized() == true (see post-conditions of isInitialize())
Note
For any pointer in newstate which directly points to the multivectors in the solver, the data is not copied.

Implements Belos::CGIteration< ScalarType, MV, OP >.

Definition at line 372 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
void Belos::CGSingleRedIter< ScalarType, MV, OP >::initialize ( )
inlinevirtual

Initialize the solver with the initial vectors from the linear problem or random data.

Implements Belos::Iteration< ScalarType, MV, OP >.

Definition at line 194 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
Teuchos::RCP<CGIterationStateBase<ScalarType,MV> > Belos::CGSingleRedIter< ScalarType, MV, OP >::getState ( ) const
inlinevirtual

Get the current state of the linear solver.

The data is only valid if isInitialized() == true.

Returns
A CGSingleRedIterationState object containing const pointers to the current solver state.

Implements Belos::CGIteration< ScalarType, MV, OP >.

Definition at line 205 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
void Belos::CGSingleRedIter< ScalarType, MV, OP >::setState ( Teuchos::RCP< CGIterationStateBase< ScalarType, MV > >  state)
inlinevirtual

Implements Belos::CGIteration< ScalarType, MV, OP >.

Definition at line 220 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
int Belos::CGSingleRedIter< ScalarType, MV, OP >::getNumIters ( ) const
inlinevirtual

Get the current iteration count.

Implements Belos::Iteration< ScalarType, MV, OP >.

Definition at line 241 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
void Belos::CGSingleRedIter< ScalarType, MV, OP >::resetNumIters ( int  iter = 0)
inlinevirtual

Reset the iteration count.

Implements Belos::Iteration< ScalarType, MV, OP >.

Definition at line 244 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
Teuchos::RCP< const MV > Belos::CGSingleRedIter< ScalarType, MV, OP >::getNativeResiduals ( std::vector< MagnitudeType > *  norms) const

Get the norms of the residuals native to the solver.

Returns
A std::vector of length blockSize containing the native residuals.

Definition at line 433 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
Teuchos::RCP<MV> Belos::CGSingleRedIter< ScalarType, MV, OP >::getCurrentUpdate ( ) const
inlinevirtual

Get the current update to the linear system.

Note
This method returns a null pointer because the linear problem is current.

Implements Belos::Iteration< ScalarType, MV, OP >.

Definition at line 253 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
const LinearProblem<ScalarType,MV,OP>& Belos::CGSingleRedIter< ScalarType, MV, OP >::getProblem ( ) const
inlinevirtual

Get a constant reference to the linear problem.

Implements Belos::Iteration< ScalarType, MV, OP >.

Definition at line 261 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
int Belos::CGSingleRedIter< ScalarType, MV, OP >::getBlockSize ( ) const
inlinevirtual

Get the blocksize to be used by the iterative solver in solving this linear problem.

Implements Belos::Iteration< ScalarType, MV, OP >.

Definition at line 264 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
void Belos::CGSingleRedIter< ScalarType, MV, OP >::setBlockSize ( int  blockSize)
inlinevirtual

Set the blocksize to be used by the iterative solver in solving this linear problem.

Implements Belos::Iteration< ScalarType, MV, OP >.

Definition at line 267 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
bool Belos::CGSingleRedIter< ScalarType, MV, OP >::isInitialized ( )
inlinevirtual

States whether the solver has been initialized or not.

Implements Belos::Iteration< ScalarType, MV, OP >.

Definition at line 273 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
void Belos::CGSingleRedIter< ScalarType, MV, OP >::setDoCondEst ( bool  )
inlinevirtual

Sets whether or not to store the diagonal for condition estimation.

Implements Belos::CGIteration< ScalarType, MV, OP >.

Definition at line 276 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
Teuchos::ArrayView<MagnitudeType> Belos::CGSingleRedIter< ScalarType, MV, OP >::getDiag ( )
inlinevirtual

Gets the diagonal for condition estimation (NOT_IMPLEMENTED)

Implements Belos::CGIteration< ScalarType, MV, OP >.

Definition at line 279 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
Teuchos::ArrayView<MagnitudeType> Belos::CGSingleRedIter< ScalarType, MV, OP >::getOffDiag ( )
inlinevirtual

Gets the off-diagonal for condition estimation (NOT_IMPLEMENTED)

Implements Belos::CGIteration< ScalarType, MV, OP >.

Definition at line 285 of file BelosCGSingleRedIter.hpp.

Member Data Documentation

template<class ScalarType , class MV , class OP >
const Teuchos::RCP<LinearProblem<ScalarType,MV,OP> > Belos::CGSingleRedIter< ScalarType, MV, OP >::lp_
private

Definition at line 300 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
const Teuchos::RCP<OutputManager<ScalarType> > Belos::CGSingleRedIter< ScalarType, MV, OP >::om_
private

Definition at line 301 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
const Teuchos::RCP<StatusTest<ScalarType,MV,OP> > Belos::CGSingleRedIter< ScalarType, MV, OP >::stest_
private

Definition at line 302 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
const Teuchos::RCP<StatusTestGenResNorm<ScalarType,MV,OP> > Belos::CGSingleRedIter< ScalarType, MV, OP >::convTest_
private

Definition at line 303 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
bool Belos::CGSingleRedIter< ScalarType, MV, OP >::initialized_
private

Definition at line 311 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
int Belos::CGSingleRedIter< ScalarType, MV, OP >::iter_
private

Definition at line 314 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
bool Belos::CGSingleRedIter< ScalarType, MV, OP >::foldConvergenceDetectionIntoAllreduce_
private

Definition at line 317 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
ScalarType Belos::CGSingleRedIter< ScalarType, MV, OP >::rHz_
private

Definition at line 320 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
ScalarType Belos::CGSingleRedIter< ScalarType, MV, OP >::rHr_
private

Definition at line 322 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
Teuchos::RCP<MV> Belos::CGSingleRedIter< ScalarType, MV, OP >::R_
private

Definition at line 328 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
Teuchos::RCP<MV> Belos::CGSingleRedIter< ScalarType, MV, OP >::Z_
private

Definition at line 330 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
Teuchos::RCP<MV> Belos::CGSingleRedIter< ScalarType, MV, OP >::AZ_
private

Definition at line 332 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
Teuchos::RCP<MV> Belos::CGSingleRedIter< ScalarType, MV, OP >::P_
private

Definition at line 334 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
Teuchos::RCP<MV> Belos::CGSingleRedIter< ScalarType, MV, OP >::AP_
private

Definition at line 336 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
Teuchos::RCP<MV> Belos::CGSingleRedIter< ScalarType, MV, OP >::W_
private

Definition at line 339 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
Teuchos::RCP<MV> Belos::CGSingleRedIter< ScalarType, MV, OP >::S_
private

Definition at line 341 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
Teuchos::RCP<MV> Belos::CGSingleRedIter< ScalarType, MV, OP >::T_
private

Definition at line 343 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
Teuchos::RCP<MV> Belos::CGSingleRedIter< ScalarType, MV, OP >::U_
private

Definition at line 345 of file BelosCGSingleRedIter.hpp.

template<class ScalarType , class MV , class OP >
Teuchos::RCP<MV> Belos::CGSingleRedIter< ScalarType, MV, OP >::V_
private

Definition at line 347 of file BelosCGSingleRedIter.hpp.

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