MueLu_RAPFactory_def.hpp

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// @HEADER
// *****************************************************************************
//        MueLu: A package for multigrid based preconditioning
//
// Copyright 2012 NTESS and the MueLu contributors.
// SPDX-License-Identifier: BSD-3-Clause
// *****************************************************************************
// @HEADER

#ifndef MUELU_RAPFACTORY_DEF_HPP
#define MUELU_RAPFACTORY_DEF_HPP

#include <sstream>

#include <Xpetra_Matrix.hpp>
#include <Xpetra_MatrixFactory.hpp>
#include <Xpetra_MatrixMatrix.hpp>
#include <Xpetra_MatrixUtils.hpp>
#include <Xpetra_TripleMatrixMultiply.hpp>

#include "MueLu_RAPFactory_decl.hpp"

#include "MueLu_MasterList.hpp"
#include "MueLu_Monitor.hpp"
#include "MueLu_PerfUtils.hpp"

namespace MueLu {

template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
RAPFactory<Scalar, LocalOrdinal, GlobalOrdinal, Node>::RAPFactory()
  : hasDeclaredInput_(false) {}

template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
RAPFactory<Scalar, LocalOrdinal, GlobalOrdinal, Node>::~RAPFactory() = default;

template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
RCP<const ParameterList> RAPFactory<Scalar, LocalOrdinal, GlobalOrdinal, Node>::GetValidParameterList() const {
  RCP<ParameterList> validParamList = rcp(new ParameterList());

#define SET_VALID_ENTRY(name) validParamList->setEntry(name, MasterList::getEntry(name))
  SET_VALID_ENTRY("transpose: use implicit");
  SET_VALID_ENTRY("rap: triple product");
  SET_VALID_ENTRY("rap: fix zero diagonals");
  SET_VALID_ENTRY("rap: fix zero diagonals threshold");
  SET_VALID_ENTRY("rap: fix zero diagonals replacement");
  SET_VALID_ENTRY("rap: relative diagonal floor");
#undef SET_VALID_ENTRY
  validParamList->set<RCP<const FactoryBase> >("A", null, "Generating factory of the matrix A used during the prolongator smoothing process");
  validParamList->set<RCP<const FactoryBase> >("P", null, "Prolongator factory");
  validParamList->set<RCP<const FactoryBase> >("R", null, "Restrictor factory");

  validParamList->set<bool>("CheckMainDiagonal", false, "Check main diagonal for zeros");
  validParamList->set<bool>("RepairMainDiagonal", false, "Repair zeros on main diagonal");

  // Make sure we don't recursively validate options for the matrixmatrix kernels
  ParameterList norecurse;
  norecurse.disableRecursiveValidation();
  validParamList->set<ParameterList>("matrixmatrix: kernel params", norecurse, "MatrixMatrix kernel parameters");

  return validParamList;
}

template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
void RAPFactory<Scalar, LocalOrdinal, GlobalOrdinal, Node>::DeclareInput(Level& fineLevel, Level& coarseLevel) const {
  const Teuchos::ParameterList& pL = GetParameterList();
  if (pL.get<bool>("transpose: use implicit") == false)
    Input(coarseLevel, "R");

  Input(fineLevel, "A");
  Input(coarseLevel, "P");

  // call DeclareInput of all user-given transfer factories
  for (std::vector<RCP<const FactoryBase> >::const_iterator it = transferFacts_.begin(); it != transferFacts_.end(); ++it)
    (*it)->CallDeclareInput(coarseLevel);

  hasDeclaredInput_ = true;
}

template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
void RAPFactory<Scalar, LocalOrdinal, GlobalOrdinal, Node>::Build(Level& fineLevel, Level& coarseLevel) const {
  const bool doTranspose       = true;
  const bool doFillComplete    = true;
  const bool doOptimizeStorage = true;
  RCP<Matrix> Ac;
  {
    FactoryMonitor m(*this, "Computing Ac", coarseLevel);
    std::ostringstream levelstr;
    levelstr << coarseLevel.GetLevelID();
    std::string labelstr = FormattingHelper::getColonLabel(coarseLevel.getObjectLabel());

    TEUCHOS_TEST_FOR_EXCEPTION(hasDeclaredInput_ == false, Exceptions::RuntimeError,
                               "MueLu::RAPFactory::Build(): CallDeclareInput has not been called before Build!");

    const Teuchos::ParameterList& pL = GetParameterList();
    RCP<Matrix> A                    = Get<RCP<Matrix> >(fineLevel, "A");
    RCP<Matrix> P                    = Get<RCP<Matrix> >(coarseLevel, "P"), AP;
    // We don't have a valid P (e.g., # global aggregates = 0) so we bail.
    // This level will ultimately be removed in MueLu_Hierarchy_defs.h via a resize()
    if (P == Teuchos::null) {
      Ac = Teuchos::null;
      Set(coarseLevel, "A", Ac);
      return;
    }

    bool isEpetra = A->getRowMap()->lib() == Xpetra::UseEpetra;
    bool isGPU    = Node::is_gpu;

    if (pL.get<bool>("rap: triple product") == false || isEpetra || isGPU) {
      if (pL.get<bool>("rap: triple product") && isEpetra)
        GetOStream(Warnings1) << "Switching from triple product to R x (A x P) since triple product has not been implemented for Epetra.\n";
      if (pL.get<bool>("rap: triple product") && isGPU)
        GetOStream(Warnings1) << "Switching from triple product to R x (A x P) since triple product has not been implemented for "
                              << Node::execution_space::name() << std::endl;

      // Reuse pattern if available (multiple solve)
      RCP<ParameterList> APparams = rcp(new ParameterList);
      if (pL.isSublist("matrixmatrix: kernel params"))
        APparams = rcp(new ParameterList(pL.sublist("matrixmatrix: kernel params")));

      // By default, we don't need global constants for A*P
      APparams->set("compute global constants: temporaries", APparams->get("compute global constants: temporaries", false));
      APparams->set("compute global constants", APparams->get("compute global constants", false));

      if (coarseLevel.IsAvailable("AP reuse data", this)) {
        GetOStream(static_cast<MsgType>(Runtime0 | Test)) << "Reusing previous AP data" << std::endl;

        APparams = coarseLevel.Get<RCP<ParameterList> >("AP reuse data", this);

        if (APparams->isParameter("graph"))
          AP = APparams->get<RCP<Matrix> >("graph");
      }

      {
        SubFactoryMonitor subM(*this, "MxM: A x P", coarseLevel);

        AP = MatrixMatrix::Multiply(*A, !doTranspose, *P, !doTranspose, AP, GetOStream(Statistics2),
                                    doFillComplete, doOptimizeStorage, labelstr + std::string("MueLu::A*P-") + levelstr.str(), APparams);
      }

      // Reuse coarse matrix memory if available (multiple solve)
      RCP<ParameterList> RAPparams = rcp(new ParameterList);
      if (pL.isSublist("matrixmatrix: kernel params"))
        RAPparams = rcp(new ParameterList(pL.sublist("matrixmatrix: kernel params")));

      if (coarseLevel.IsAvailable("RAP reuse data", this)) {
        GetOStream(static_cast<MsgType>(Runtime0 | Test)) << "Reusing previous RAP data" << std::endl;

        RAPparams = coarseLevel.Get<RCP<ParameterList> >("RAP reuse data", this);

        if (RAPparams->isParameter("graph"))
          Ac = RAPparams->get<RCP<Matrix> >("graph");

        // Some eigenvalue may have been cached with the matrix in the previous run.
        // As the matrix values will be updated, we need to reset the eigenvalue.
        Ac->SetMaxEigenvalueEstimate(-Teuchos::ScalarTraits<SC>::one());
      }

      // We *always* need global constants for the RAP, but not for the temps
      RAPparams->set("compute global constants: temporaries", RAPparams->get("compute global constants: temporaries", false));
      RAPparams->set("compute global constants", true);

      // Allow optimization of storage.
      // This is necessary for new faster Epetra MM kernels.
      // Seems to work with matrix modifications to repair diagonal entries.

      if (pL.get<bool>("transpose: use implicit") == true) {
        SubFactoryMonitor m2(*this, "MxM: P' x (AP) (implicit)", coarseLevel);

        Ac = MatrixMatrix::Multiply(*P, doTranspose, *AP, !doTranspose, Ac, GetOStream(Statistics2),
                                    doFillComplete, doOptimizeStorage, labelstr + std::string("MueLu::R*(AP)-implicit-") + levelstr.str(), RAPparams);

      } else {
        RCP<Matrix> R = Get<RCP<Matrix> >(coarseLevel, "R");

        SubFactoryMonitor m2(*this, "MxM: R x (AP) (explicit)", coarseLevel);

        Ac = MatrixMatrix::Multiply(*R, !doTranspose, *AP, !doTranspose, Ac, GetOStream(Statistics2),
                                    doFillComplete, doOptimizeStorage, labelstr + std::string("MueLu::R*(AP)-explicit-") + levelstr.str(), RAPparams);
      }

      Teuchos::ArrayView<const double> relativeFloor = pL.get<Teuchos::Array<double> >("rap: relative diagonal floor")();
      if (relativeFloor.size() > 0) {
        Xpetra::MatrixUtils<SC, LO, GO, NO>::RelativeDiagonalBoost(Ac, relativeFloor, GetOStream(Statistics2));
      }

      bool repairZeroDiagonals = pL.get<bool>("RepairMainDiagonal") || pL.get<bool>("rap: fix zero diagonals");
      bool checkAc             = pL.get<bool>("CheckMainDiagonal") || pL.get<bool>("rap: fix zero diagonals");
      ;
      if (checkAc || repairZeroDiagonals) {
        using magnitudeType = typename Teuchos::ScalarTraits<Scalar>::magnitudeType;
        magnitudeType threshold;
        if (pL.isType<magnitudeType>("rap: fix zero diagonals threshold"))
          threshold = pL.get<magnitudeType>("rap: fix zero diagonals threshold");
        else
          threshold = Teuchos::as<magnitudeType>(pL.get<double>("rap: fix zero diagonals threshold"));
        Scalar replacement = Teuchos::as<Scalar>(pL.get<double>("rap: fix zero diagonals replacement"));
        Xpetra::MatrixUtils<SC, LO, GO, NO>::CheckRepairMainDiagonal(Ac, repairZeroDiagonals, GetOStream(Warnings1), threshold, replacement);
      }

      if (IsPrint(Statistics2)) {
        RCP<ParameterList> params = rcp(new ParameterList());
        ;
        params->set("printLoadBalancingInfo", true);
        params->set("printCommInfo", true);
        GetOStream(Statistics2) << PerfUtils::PrintMatrixInfo(*Ac, "Ac", params);
      }

      if (!Ac.is_null()) {
        std::ostringstream oss;
        oss << "A_" << coarseLevel.GetLevelID();
        Ac->setObjectLabel(oss.str());
      }
      Set(coarseLevel, "A", Ac);

      if (!isGPU) {
        APparams->set("graph", AP);
        Set(coarseLevel, "AP reuse data", APparams);
      }
      if (!isGPU) {
        RAPparams->set("graph", Ac);
        Set(coarseLevel, "RAP reuse data", RAPparams);
      }
    } else {
      RCP<ParameterList> RAPparams = rcp(new ParameterList);
      if (pL.isSublist("matrixmatrix: kernel params"))
        RAPparams->sublist("matrixmatrix: kernel params") = pL.sublist("matrixmatrix: kernel params");

      if (coarseLevel.IsAvailable("RAP reuse data", this)) {
        GetOStream(static_cast<MsgType>(Runtime0 | Test)) << "Reusing previous RAP data" << std::endl;

        RAPparams = coarseLevel.Get<RCP<ParameterList> >("RAP reuse data", this);

        if (RAPparams->isParameter("graph"))
          Ac = RAPparams->get<RCP<Matrix> >("graph");

        // Some eigenvalue may have been cached with the matrix in the previous run.
        // As the matrix values will be updated, we need to reset the eigenvalue.
        Ac->SetMaxEigenvalueEstimate(-Teuchos::ScalarTraits<SC>::one());
      }

      // We *always* need global constants for the RAP, but not for the temps
      RAPparams->set("compute global constants: temporaries", RAPparams->get("compute global constants: temporaries", false));
      RAPparams->set("compute global constants", true);

      if (pL.get<bool>("transpose: use implicit") == true) {
        Ac = MatrixFactory::Build(P->getDomainMap(), Teuchos::as<LO>(0));

        SubFactoryMonitor m2(*this, "MxMxM: R x A x P (implicit)", coarseLevel);

        Xpetra::TripleMatrixMultiply<SC, LO, GO, NO>::
            MultiplyRAP(*P, doTranspose, *A, !doTranspose, *P, !doTranspose, *Ac, doFillComplete,
                        doOptimizeStorage, labelstr + std::string("MueLu::R*A*P-implicit-") + levelstr.str(),
                        RAPparams);
      } else {
        RCP<Matrix> R = Get<RCP<Matrix> >(coarseLevel, "R");
        Ac            = MatrixFactory::Build(R->getRowMap(), Teuchos::as<LO>(0));

        SubFactoryMonitor m2(*this, "MxMxM: R x A x P (explicit)", coarseLevel);

        Xpetra::TripleMatrixMultiply<SC, LO, GO, NO>::
            MultiplyRAP(*R, !doTranspose, *A, !doTranspose, *P, !doTranspose, *Ac, doFillComplete,
                        doOptimizeStorage, labelstr + std::string("MueLu::R*A*P-explicit-") + levelstr.str(),
                        RAPparams);
      }

      Teuchos::ArrayView<const double> relativeFloor = pL.get<Teuchos::Array<double> >("rap: relative diagonal floor")();
      if (relativeFloor.size() > 0) {
        Xpetra::MatrixUtils<SC, LO, GO, NO>::RelativeDiagonalBoost(Ac, relativeFloor, GetOStream(Statistics2));
      }

      bool repairZeroDiagonals = pL.get<bool>("RepairMainDiagonal") || pL.get<bool>("rap: fix zero diagonals");
      bool checkAc             = pL.get<bool>("CheckMainDiagonal") || pL.get<bool>("rap: fix zero diagonals");
      ;
      if (checkAc || repairZeroDiagonals) {
        using magnitudeType = typename Teuchos::ScalarTraits<Scalar>::magnitudeType;
        magnitudeType threshold;
        if (pL.isType<magnitudeType>("rap: fix zero diagonals threshold"))
          threshold = pL.get<magnitudeType>("rap: fix zero diagonals threshold");
        else
          threshold = Teuchos::as<magnitudeType>(pL.get<double>("rap: fix zero diagonals threshold"));
        Scalar replacement = Teuchos::as<Scalar>(pL.get<double>("rap: fix zero diagonals replacement"));
        Xpetra::MatrixUtils<SC, LO, GO, NO>::CheckRepairMainDiagonal(Ac, repairZeroDiagonals, GetOStream(Warnings1), threshold, replacement);
      }

      if (IsPrint(Statistics2)) {
        RCP<ParameterList> params = rcp(new ParameterList());
        ;
        params->set("printLoadBalancingInfo", true);
        params->set("printCommInfo", true);
        GetOStream(Statistics2) << PerfUtils::PrintMatrixInfo(*Ac, "Ac", params);
      }

      if (!Ac.is_null()) {
        std::ostringstream oss;
        oss << "A_" << coarseLevel.GetLevelID();
        Ac->setObjectLabel(oss.str());
      }
      Set(coarseLevel, "A", Ac);

      if (!isGPU) {
        RAPparams->set("graph", Ac);
        Set(coarseLevel, "RAP reuse data", RAPparams);
      }
    }
  }

#ifdef HAVE_MUELU_DEBUG
  MatrixUtils::checkLocalRowMapMatchesColMap(*Ac);
#endif  // HAVE_MUELU_DEBUG

  if (transferFacts_.begin() != transferFacts_.end()) {
    SubFactoryMonitor m(*this, "Projections", coarseLevel);

    // call Build of all user-given transfer factories
    for (std::vector<RCP<const FactoryBase> >::const_iterator it = transferFacts_.begin(); it != transferFacts_.end(); ++it) {
      RCP<const FactoryBase> fac = *it;
      GetOStream(Runtime0) << "RAPFactory: call transfer factory: " << fac->description() << std::endl;
      fac->CallBuild(coarseLevel);
      // Coordinates transfer is marginally different from all other operations
      // because it is *optional*, and not required. For instance, we may need
      // coordinates only on level 4 if we start repartitioning from that level,
      // but we don't need them on level 1,2,3. As our current Hierarchy setup
      // assumes propagation of dependencies only through three levels, this
      // means that we need to rely on other methods to propagate optional data.
      //
      // The method currently used is through RAP transfer factories, which are
      // simply factories which are called at the end of RAP with a single goal:
      // transfer some fine data to coarser level. Because these factories are
      // kind of outside of the mainline factories, they behave different. In
      // particular, we call their Build method explicitly, rather than through
      // Get calls. This difference is significant, as the Get call is smart
      // enough to know when to release all factory dependencies, and Build is
      // dumb. This led to the following CoordinatesTransferFactory sequence:
      // 1. Request level 0
      // 2. Request level 1
      // 3. Request level 0
      // 4. Release level 0
      // 5. Release level 1
      //
      // The problem is missing "6. Release level 0". Because it was missing,
      // we had outstanding request on "Coordinates", "Aggregates" and
      // "CoarseMap" on level 0.
      //
      // This was fixed by explicitly calling Release on transfer factories in
      // RAPFactory. I am still unsure how exactly it works, but now we have
      // clear data requests for all levels.
      coarseLevel.Release(*fac);
    }
  }
}

template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
void RAPFactory<Scalar, LocalOrdinal, GlobalOrdinal, Node>::AddTransferFactory(const RCP<const FactoryBase>& factory) {
  // check if it's a TwoLevelFactoryBase based transfer factory
  TEUCHOS_TEST_FOR_EXCEPTION(Teuchos::rcp_dynamic_cast<const TwoLevelFactoryBase>(factory) == Teuchos::null, Exceptions::BadCast,
                             "MueLu::RAPFactory::AddTransferFactory: Transfer factory is not derived from TwoLevelFactoryBase. "
                             "This is very strange. (Note: you can remove this exception if there's a good reason for)");
  TEUCHOS_TEST_FOR_EXCEPTION(hasDeclaredInput_, Exceptions::RuntimeError, "MueLu::RAPFactory::AddTransferFactory: Factory is being added after we have already declared input");
  transferFacts_.push_back(factory);
}

}  // namespace MueLu

#define MUELU_RAPFACTORY_SHORT
#endif  // MUELU_RAPFACTORY_DEF_HPP