Teko_IterativePreconditionerFactory.cpp

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//      Teko: A package for block and physics based preconditioning
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// Teko includes
#include "Teko_IterativePreconditionerFactory.hpp"

#include "Teko_PreconditionerInverseFactory.hpp"

namespace Teko {

IterativePreconditionerFactory::IterativePreconditionerFactory()
   : correctionNum_(0), precFactory_(Teuchos::null)
{ }

IterativePreconditionerFactory::IterativePreconditionerFactory(unsigned int correctionNum,
                            const Teuchos::RCP<Teko::InverseFactory> & precFactory)
   : correctionNum_(correctionNum), precFactory_(precFactory)
{ }

IterativePreconditionerFactory::IterativePreconditionerFactory(unsigned int correctionNum,
                            const Teuchos::RCP<Teko::PreconditionerFactory> & precFactory)
   : correctionNum_(correctionNum)
{
   precFactory_ = Teuchos::rcp(new Teko::PreconditionerInverseFactory(precFactory,precFactory->getRequestHandler()));
}


LinearOp IterativePreconditionerFactory::buildPreconditionerOperator(LinearOp & lo,PreconditionerState & state) const
{
   TEUCHOS_TEST_FOR_EXCEPTION(precFactory_==Teuchos::null,std::runtime_error,
                      "ERROR: Teko::IterativePreconditionerFactory::buildPreconditionerOperator requires that a "
                   << "preconditioner factory has been set. Currently it is null!");

   // build user specified preconditioner
   ModifiableLinearOp & invP = state.getModifiableOp("prec");
   if(invP==Teuchos::null)
      invP = Teko::buildInverse(*precFactory_,lo);
   else
      Teko::rebuildInverse(*precFactory_,lo,invP);

   // // no repititions are required
   // if(correctionNum_==0) return invP;

   // now build correction operator
   LinearOp I = Thyra::identity(lo->range(),"I");
   LinearOp AiP = multiply(lo,invP.getConst(),"AiP");
   LinearOp correction = add(I,scale(-1.0,AiP)); // I - A * iPA

   LinearOp resMap = I; // will map r_n to r_{n+1}
   for(unsigned int i=0;i<correctionNum_;i++) 
      resMap = add(I,multiply(resMap,correction)); // resMap = I + resMap*(I-A*iP)
   
   // iP = (I-A*iP)^{correctionNum}
   return multiply(invP.getConst(),resMap);
}

void IterativePreconditionerFactory::initializeFromParameterList(const Teuchos::ParameterList & settings)
{

   correctionNum_ = 1;
   if(settings.isParameter("Iteration Count"))
      correctionNum_ = settings.get<int>("Iteration Count");
 
   TEUCHOS_TEST_FOR_EXCEPTION(not settings.isParameter("Preconditioner Type"),std::runtime_error,
                      "Parameter \"Preconditioner Type\" is required by a Teko::IterativePreconditionerFactory");
      
   // grab library and preconditioner name
   Teuchos::RCP<const InverseLibrary> il = getInverseLibrary();
   std::string precName = settings.get<std::string>("Preconditioner Type");

   // build preconditioner factory
   precFactory_ = il->getInverseFactory(precName);
   TEUCHOS_TEST_FOR_EXCEPTION(precFactory_==Teuchos::null,std::runtime_error,
                      "ERROR: \"Preconditioner Type\" = " << precName 
                   << " could not be found");
}

Teuchos::RCP<Teuchos::ParameterList> IterativePreconditionerFactory::getRequestedParameters() const
{
   TEUCHOS_TEST_FOR_EXCEPTION(precFactory_==Teuchos::null,std::runtime_error,
                      "ERROR: Teko::IterativePreconditionerFactory::getRequestedParameters requires that a "
                   << "preconditioner factory has been set. Currently it is null!");

   return precFactory_->getRequestedParameters();
}

bool IterativePreconditionerFactory::updateRequestedParameters(const Teuchos::ParameterList & pl)
{
   TEUCHOS_TEST_FOR_EXCEPTION(precFactory_==Teuchos::null,std::runtime_error,
                      "ERROR: Teko::IterativePreconditionerFactory::updateRequestedParameters requires that a "
                   << "preconditioner factory has been set. Currently it is null!");

   return precFactory_->updateRequestedParameters(pl);
}

} // end namespace Teko