Teko_MultPreconditionerFactory.cpp

/*
// @HEADER
// 
// ***********************************************************************
// 
//      Teko: A package for block and physics based preconditioning
//                  Copyright 2010 Sandia Corporation 
//  
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
// the U.S. Government retains certain rights in this software.
//  
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//  
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//  
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//  
// 3. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission. 
//  
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//  
// Questions? Contact Eric C. Cyr (eccyr@sandia.gov)
// 
// ***********************************************************************
// 
// @HEADER

*/

#include "Teko_MultPreconditionerFactory.hpp"

namespace Teko {

using Teuchos::RCP;

void MultPrecsLinearOp::implicitApply(const Teko::BlockedMultiVector & r, Teko::BlockedMultiVector & y,
                     const double alpha, const double beta) const 
{ 
   // Casting is a bit delicate. We basically use 
   //
   //  1) deepcopy      to copy & cast BlockedMultiVectors to MultiVectors.
   //
   //  2) toMultiVector to cast BlockedMultiVectors to MultiVectors.
   //
   Teko::MultiVector MOne_r = Teko::deepcopy(r);
   Teko::MultiVector t      = Teko::deepcopy(r);
   Teko::MultiVector w      = Teko::toMultiVector(y);

   Teko::applyOp(M1_, r, MOne_r);
   Teko::applyOp(A_, MOne_r,  t);
   Teko::update(1.,r,-1.,t);
   Teko::applyOp(M2_, t,  w);
   Teko::update(1.,MOne_r, 1.,  w);
}

MultPreconditionerFactory 
   ::MultPreconditionerFactory(const RCP<const Teko::BlockPreconditionerFactory> & FirstFactory,
                                  const RCP<const Teko::BlockPreconditionerFactory> & SecondFactory)
   : FirstFactory_(FirstFactory), SecondFactory_(SecondFactory)
{ } 

MultPreconditionerFactory::MultPreconditionerFactory()
{ }

RCP<Teko::PreconditionerState> MultPreconditionerFactory::buildPreconditionerState() const
{ 
   MultPrecondState*   mystate = new MultPrecondState(); 
   mystate->StateOne_ = Teuchos::rcp_dynamic_cast<BlockPreconditionerState>(FirstFactory_->buildPreconditionerState());
   mystate->StateTwo_ = Teuchos::rcp_dynamic_cast<BlockPreconditionerState>(SecondFactory_->buildPreconditionerState());
   return rcp(mystate);
}


Teko::LinearOp MultPreconditionerFactory
   ::buildPreconditionerOperator(Teko::BlockedLinearOp & blockOp,
                                 Teko::BlockPreconditionerState & state) const
{
   
   MultPrecondState *MyState = dynamic_cast<MultPrecondState *> (&state);

   TEUCHOS_ASSERT(MyState != 0);

   Teko::LinearOp M1 = FirstFactory_->buildPreconditionerOperator(blockOp, *MyState->StateOne_);
   Teko::LinearOp M2 = SecondFactory_->buildPreconditionerOperator(blockOp, *MyState->StateTwo_);


   /*************************************************************************
      A different way to create the same preconditioner using the funky 
      matrix representation discussed above. At the present time, there
      appears to be some kind of bug in Thrya so this doesn't work.

   const RCP<const Thyra::LinearOpBase<double>> Mat1= Thyra::block2x1(Teko::identity(Teko::rangeSpace(M1)) ,M1);
   const RCP<const Thyra::LinearOpBase<double>> Mat3= Thyra::block1x2(M2,Teko::identity(Teko::rangeSpace(M1)));
   const RCP<const Thyra::LinearOpBase<double>> Mat2= Thyra::block2x2(
                     Teko::identity(Teko::rangeSpace(M1)),                            Teko::scale(-1.,Teko::toLinearOp(blockOp)),
                     Thyra::zero<double>(Teko::rangeSpace(M1),Teko::domainSpace(M1)), Teko::identity(Teko::rangeSpace(M1)));
   Teko::LinearOp invA = Teko::multiply(Mat3,Mat2,Mat1);

   return invA; 
    *************************************************************************/

   // construct an implicit operator corresponding to multiplicative 
   // preconditioning, wrap it in an rcp pointer and return.

   return Teuchos::rcp(new MultPrecsLinearOp(blockOp,M1,M2));
}

void MultPreconditionerFactory::initializeFromParameterList(const Teuchos::ParameterList & pl)
{
   RCP<const InverseLibrary> invLib = getInverseLibrary();

   // get string specifying inverse
   std::string aStr="", bStr="";

   // "parse" the parameter list
   aStr = pl.get<std::string>("Preconditioner A");
   bStr = pl.get<std::string>("Preconditioner B");

   RCP<const Teuchos::ParameterList> aSettings = invLib->getParameterList(aStr);
   RCP<const Teuchos::ParameterList> bSettings = invLib->getParameterList(bStr);

   // build preconditioner from the parameters
   std::string aType = aSettings->get<std::string>("Preconditioner Type");
   RCP<Teko::PreconditionerFactory> precA
         = Teko::BlockPreconditionerFactory::buildPreconditionerFactory(aType,aSettings->sublist("Preconditioner Settings"),invLib);

   // build preconditioner from the parameters
   std::string bType = bSettings->get<std::string>("Preconditioner Type");
   RCP<Teko::PreconditionerFactory> precB
         = Teko::BlockPreconditionerFactory::buildPreconditionerFactory(bType,bSettings->sublist("Preconditioner Settings"),invLib);

   // set precondtioners
   FirstFactory_ = Teuchos::rcp_dynamic_cast<const Teko::BlockPreconditionerFactory>(precA);
   SecondFactory_ = Teuchos::rcp_dynamic_cast<const Teko::BlockPreconditionerFactory>(precB);
}

} // end namespace Teko