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MueLu_BlockedGaussSeidelSmoother_def.hpp
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46 
47 #ifndef MUELU_BLOCKEDGAUSSSEIDELSMOOTHER_DEF_HPP_
48 #define MUELU_BLOCKEDGAUSSSEIDELSMOOTHER_DEF_HPP_
49 
50 #include "Teuchos_ArrayViewDecl.hpp"
51 #include "Teuchos_ScalarTraits.hpp"
52 
53 #include "MueLu_ConfigDefs.hpp"
54 
55 #include <Xpetra_BlockReorderManager.hpp>
56 #include <Xpetra_Matrix.hpp>
57 #include <Xpetra_BlockedCrsMatrix.hpp>
58 #include <Xpetra_ReorderedBlockedCrsMatrix.hpp>
59 #include <Xpetra_ReorderedBlockedMultiVector.hpp>
60 #include <Xpetra_MultiVectorFactory.hpp>
61 
63 #include "MueLu_Level.hpp"
64 #include "MueLu_Utilities.hpp"
65 #include "MueLu_Monitor.hpp"
66 #include "MueLu_HierarchyUtils.hpp"
67 #include "MueLu_SmootherBase.hpp"
68 
69 namespace MueLu {
70 
71  template <class Scalar,class LocalOrdinal, class GlobalOrdinal, class Node>
73  : type_("blocked GaussSeidel"), A_(Teuchos::null)
74  {
75  FactManager_.reserve(10); // TODO fix me!
76  }
77 
78  template <class Scalar,class LocalOrdinal, class GlobalOrdinal, class Node>
80 
81  template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
83  RCP<ParameterList> validParamList = rcp(new ParameterList());
84 
85  validParamList->set< RCP<const FactoryBase> >("A", Teuchos::null, "Generating factory of the matrix A");
86  validParamList->set< Scalar > ("Damping factor", 1.0, "Damping/Scaling factor in BGS");
87  validParamList->set< LocalOrdinal > ("Sweeps", 1, "Number of BGS sweeps (default = 1)");
88 
89  return validParamList;
90  }
91 
92  template <class Scalar,class LocalOrdinal, class GlobalOrdinal, class Node>
93  void BlockedGaussSeidelSmoother<Scalar, LocalOrdinal, GlobalOrdinal, Node>::AddFactoryManager(RCP<const FactoryManagerBase> FactManager, int pos) {
94  TEUCHOS_TEST_FOR_EXCEPTION(pos < 0, Exceptions::RuntimeError, "MueLu::BlockedGaussSeidelSmoother::AddFactoryManager: parameter \'pos\' must not be negative! error.");
95 
96  size_t myPos = Teuchos::as<size_t>(pos);
97 
98  if (myPos < FactManager_.size()) {
99  // replace existing entries in FactManager_ vector
100  FactManager_.at(myPos) = FactManager;
101  } else if(myPos == FactManager_.size()) {
102  // append new Factory manager at the end of the vector
103  FactManager_.push_back(FactManager);
104  } else { // if(myPos > FactManager_.size())
105  RCP<Teuchos::FancyOStream> out = Teuchos::fancyOStream(Teuchos::rcpFromRef(std::cout));
106  *out << "Warning: cannot add new FactoryManager at proper position " << pos << ". The FactoryManager is just appended to the end. Check this!" << std::endl;
107 
108  // add new Factory manager in the end of the vector
109  FactManager_.push_back(FactManager);
110  }
111  }
112 
113  template <class Scalar,class LocalOrdinal, class GlobalOrdinal, class Node>
115  //this->Input(currentLevel, "A");
116  // TODO: check me: why is this->Input not freeing properly A in release mode?
117  currentLevel.DeclareInput("A",this->GetFactory("A").get());
118 
119  // loop over all factory managers for the subblocks of blocked operator A
120  std::vector<Teuchos::RCP<const FactoryManagerBase> >::const_iterator it;
121  for(it = FactManager_.begin(); it!=FactManager_.end(); ++it) {
122  SetFactoryManager currentSFM (rcpFromRef(currentLevel), *it);
123 
124  // request "Smoother" for current subblock row.
125  currentLevel.DeclareInput("PreSmoother",(*it)->GetFactory("Smoother").get());
126 
127  // request "A" for current subblock row (only needed for Thyra mode)
128  currentLevel.DeclareInput("A",(*it)->GetFactory("A").get());
129  }
130  }
131 
132  template <class Scalar,class LocalOrdinal, class GlobalOrdinal, class Node>
134 
135  RCP<Teuchos::FancyOStream> out = Teuchos::fancyOStream(Teuchos::rcpFromRef(std::cout));
136 
137  FactoryMonitor m(*this, "Setup blocked Gauss-Seidel Smoother", currentLevel);
138  if (SmootherPrototype::IsSetup() == true) this->GetOStream(Warnings0) << "MueLu::BlockedGaussSeidelSmoother::Setup(): Setup() has already been called";
139 
140  // extract blocked operator A from current level
141  A_ = Factory::Get< RCP<Matrix> >(currentLevel, "A"); // A needed for extracting map extractors
142  RCP<BlockedCrsMatrix> bA = Teuchos::rcp_dynamic_cast<BlockedCrsMatrix>(A_);
143  TEUCHOS_TEST_FOR_EXCEPTION(bA==Teuchos::null, Exceptions::BadCast, "MueLu::BlockedPFactory::Build: input matrix A is not of type BlockedCrsMatrix! error.");
144 
145  // plausibility check
146  TEUCHOS_TEST_FOR_EXCEPTION(bA->Rows() != FactManager_.size(), Exceptions::RuntimeError, "MueLu::BlockedGaussSeidelSmoother::Setup: number of block rows of A is " << bA->Rows() << " and does not match number of SubFactoryManagers " << FactManager_.size() << ". error.");
147  TEUCHOS_TEST_FOR_EXCEPTION(bA->Cols() != FactManager_.size(), Exceptions::RuntimeError, "MueLu::BlockedGaussSeidelSmoother::Setup: number of block cols of A is " << bA->Cols() << " and does not match number of SubFactoryManagers " << FactManager_.size() << ". error.");
148 
149  // store map extractors
150  rangeMapExtractor_ = bA->getRangeMapExtractor();
151  domainMapExtractor_ = bA->getDomainMapExtractor();
152 
153  // loop over all factory managers for the subblocks of blocked operator A
154  std::vector<Teuchos::RCP<const FactoryManagerBase> >::const_iterator it;
155  for(it = FactManager_.begin(); it!=FactManager_.end(); ++it) {
156  SetFactoryManager currentSFM (rcpFromRef(currentLevel), *it);
157 
158  // extract Smoother for current block row (BGS ordering)
159  RCP<const SmootherBase> Smoo = currentLevel.Get< RCP<SmootherBase> >("PreSmoother",(*it)->GetFactory("Smoother").get());
160  Inverse_.push_back(Smoo);
161 
162  // store whether subblock matrix is blocked or not!
163  RCP<Matrix> Aii = currentLevel.Get< RCP<Matrix> >("A",(*it)->GetFactory("A").get());
164  bIsBlockedOperator_.push_back(Teuchos::rcp_dynamic_cast<BlockedCrsMatrix>(Aii)!=Teuchos::null);
165  }
166 
168  }
169 
170  template <class Scalar,class LocalOrdinal, class GlobalOrdinal, class Node>
171  void BlockedGaussSeidelSmoother<Scalar, LocalOrdinal, GlobalOrdinal, Node>::Apply(MultiVector &X, const MultiVector& B, bool InitialGuessIsZero) const
172  {
173  TEUCHOS_TEST_FOR_EXCEPTION(SmootherPrototype::IsSetup() == false, Exceptions::RuntimeError, "MueLu::BlockedGaussSeidelSmoother::Apply(): Setup() has not been called");
174 
175 #if 0 // def HAVE_MUELU_DEBUG
176  // TODO simplify this debug check
177  RCP<MultiVector> rcpDebugX = Teuchos::rcpFromRef(X);
178  RCP<const MultiVector> rcpDebugB = Teuchos::rcpFromRef(B);
179  RCP<BlockedMultiVector> rcpBDebugX = Teuchos::rcp_dynamic_cast<BlockedMultiVector>(rcpDebugX);
180  RCP<const BlockedMultiVector> rcpBDebugB = Teuchos::rcp_dynamic_cast<const BlockedMultiVector>(rcpDebugB);
181  //RCP<BlockedCrsMatrix> bA = Teuchos::rcp_dynamic_cast<BlockedCrsMatrix>(A_);
182  if(rcpBDebugB.is_null() == false) {
183  //this->GetOStream(Runtime1) << "BlockedGaussSeidel: B is a BlockedMultiVector of size " << B.getMap()->getGlobalNumElements() << " with " << rcpBDebugB->getBlockedMap()->getNumMaps() << " blocks." << std::endl;
184  //TEUCHOS_TEST_FOR_EXCEPTION(A_->getRangeMap()->isSameAs(*(B.getMap())) == false, Exceptions::RuntimeError, "MueLu::BlockedGaussSeidelSmoother::Apply(): The map of RHS vector B is not the same as range map of the blocked operator A. Please check the map of B and A.");
185  } else {
186  //this->GetOStream(Runtime1) << "BlockedGaussSeidel: B is a MultiVector of size " << B.getMap()->getGlobalNumElements() << std::endl;
187  //TEUCHOS_TEST_FOR_EXCEPTION(bA->getFullRangeMap()->isSameAs(*(B.getMap())) == false, Exceptions::RuntimeError, "MueLu::BlockedGaussSeidelSmoother::Apply(): The map of RHS vector B is not the same as range map of the blocked operator A. Please check the map of B and A.");
188  }
189  if(rcpBDebugX.is_null() == false) {
190  //this->GetOStream(Runtime1) << "BlockedGaussSeidel: X is a BlockedMultiVector of size " << X.getMap()->getGlobalNumElements() << " with " << rcpBDebugX->getBlockedMap()->getNumMaps() << " blocks." << std::endl;
191  //TEUCHOS_TEST_FOR_EXCEPTION(A_->getDomainMap()->isSameAs(*(X.getMap())) == false, Exceptions::RuntimeError, "MueLu::BlockedGaussSeidelSmoother::Apply(): The map of the solution vector X is not the same as domain map of the blocked operator A. Please check the map of X and A.");
192  } else {
193  //this->GetOStream(Runtime1) << "BlockedGaussSeidel: X is a MultiVector of size " << X.getMap()->getGlobalNumElements() << std::endl;
194  //TEUCHOS_TEST_FOR_EXCEPTION(bA->getFullDomainMap()->isSameAs(*(X.getMap())) == false, Exceptions::RuntimeError, "MueLu::BlockedGaussSeidelSmoother::Apply(): The map of the solution vector X is not the same as domain map of the blocked operator A. Please check the map of X and A.");
195  }
196 #endif
197  SC zero = Teuchos::ScalarTraits<SC>::zero(), one = Teuchos::ScalarTraits<SC>::one();
198 
199  // Input variables used for the rest of the algorithm
200  RCP<MultiVector> rcpX = Teuchos::rcpFromRef(X);
201  RCP<const MultiVector> rcpB = Teuchos::rcpFromRef(B);
202 
203  // make sure that both rcpX and rcpB are BlockedMultiVector objects
204  bool bCopyResultX = false;
205  RCP<BlockedCrsMatrix> bA = Teuchos::rcp_dynamic_cast<BlockedCrsMatrix>(A_);
206  MUELU_TEST_FOR_EXCEPTION(bA.is_null() == true, Exceptions::RuntimeError, "MueLu::BlockedGaussSeidelSmoother::Apply(): A_ must be a BlockedCrsMatrix");
207  RCP<BlockedMultiVector> bX = Teuchos::rcp_dynamic_cast<BlockedMultiVector>(rcpX);
208  RCP<const BlockedMultiVector> bB = Teuchos::rcp_dynamic_cast<const BlockedMultiVector>(rcpB);
209 
210  if(bX.is_null() == true) {
211  RCP<MultiVector> test = Teuchos::rcp(new BlockedMultiVector(bA->getBlockedDomainMap(),rcpX));
212  rcpX.swap(test);
213  bCopyResultX = true;
214  }
215 
216  if(bB.is_null() == true) {
217  RCP<const MultiVector> test = Teuchos::rcp(new BlockedMultiVector(bA->getBlockedRangeMap(),rcpB));
218  rcpB.swap(test);
219  }
220 
221  // we now can guarantee that X and B are blocked multi vectors
222  bX = Teuchos::rcp_dynamic_cast<BlockedMultiVector>(rcpX);
223  bB = Teuchos::rcp_dynamic_cast<const BlockedMultiVector>(rcpB);
224 
225  // check the type of operator
226  RCP<Xpetra::ReorderedBlockedCrsMatrix<Scalar,LocalOrdinal,GlobalOrdinal,Node> > rbA = Teuchos::rcp_dynamic_cast<Xpetra::ReorderedBlockedCrsMatrix<Scalar,LocalOrdinal,GlobalOrdinal,Node> >(bA);
227  if(rbA.is_null() == false) {
228  // A is a ReorderedBlockedCrsMatrix
229  Teuchos::RCP<const Xpetra::BlockReorderManager > brm = rbA->getBlockReorderManager();
230 
231  // check type of X vector
232  if(bX->getBlockedMap()->getNumMaps() != bA->getDomainMapExtractor()->NumMaps()) {
233  // X is a blocked multi vector but incompatible to the reordered blocked operator A
234  Teuchos::RCP<MultiVector> test =
235  buildReorderedBlockedMultiVector(brm, bX);
236  rcpX.swap(test);
237  }
238  if(bB->getBlockedMap()->getNumMaps() != bA->getRangeMapExtractor()->NumMaps()) {
239  // B is a blocked multi vector but incompatible to the reordered blocked operator A
240  Teuchos::RCP<const MultiVector> test =
241  buildReorderedBlockedMultiVector(brm, bB);
242  rcpB.swap(test);
243  }
244  }
245 
246 
247  // check the type of operator
248  /*RCP<BlockedCrsMatrix> bA = Teuchos::rcp_dynamic_cast<BlockedCrsMatrix>(A_);
249  MUELU_TEST_FOR_EXCEPTION(bA.is_null() == true, Exceptions::RuntimeError, "MueLu::BlockedGaussSeidelSmoother::Apply(): A_ must be a BlockedCrsMatrix");
250  RCP<Xpetra::ReorderedBlockedCrsMatrix<Scalar,LocalOrdinal,GlobalOrdinal,Node> > rbA = Teuchos::rcp_dynamic_cast<Xpetra::ReorderedBlockedCrsMatrix<Scalar,LocalOrdinal,GlobalOrdinal,Node> >(bA);
251  if(rbA.is_null() == false) {
252  // A is a ReorderedBlockedCrsMatrix
253  Teuchos::RCP<const Xpetra::BlockReorderManager > brm = rbA->getBlockReorderManager();
254 
255  // check type of vectors
256  RCP<BlockedMultiVector> bX = Teuchos::rcp_dynamic_cast<BlockedMultiVector>(rcpX);
257  RCP<const BlockedMultiVector> bB = Teuchos::rcp_dynamic_cast<const BlockedMultiVector>(rcpB);
258 
259  // check type of X vector
260  if(bX.is_null() == false && bX->getBlockedMap()->getNumMaps() != bA->getDomainMapExtractor()->NumMaps()) {
261  RCP<ReorderedBlockedMultiVector> rbX = Teuchos::rcp_dynamic_cast<ReorderedBlockedMultiVector>(bX);
262  if(rbX.is_null() == true) {
263  // X is a blocked multi vector but not reordered
264  // However, A is a reordered blocked operator
265  // We have to make sure, that A and X use compatible maps
266  Teuchos::RCP<MultiVector> test =
267  buildReorderedBlockedMultiVector(brm, bX);
268  rcpX.swap(test);
269  }
270  }
271  if(bB.is_null() == false && bB->getBlockedMap()->getNumMaps() != bA->getRangeMapExtractor()->NumMaps()) {
272  RCP<const ReorderedBlockedMultiVector> rbB = Teuchos::rcp_dynamic_cast<const ReorderedBlockedMultiVector>(bB);
273  if(rbB.is_null() == true) {
274  // B is a blocked multi vector but not reordered
275  // However, A is a reordered blocked operator
276  // We have to make sure, that A and X use compatible maps
277  Teuchos::RCP<const MultiVector> test =
278  buildReorderedBlockedMultiVector(brm, bB);
279  rcpB.swap(test);
280  }
281  }
282  }*/
283 
284  // Throughout the rest of the algorithm rcpX and rcpB are used for solution vector and RHS
285 
286  RCP<MultiVector> residual = MultiVectorFactory::Build(rcpB->getMap(), rcpB->getNumVectors());
287  RCP<MultiVector> tempres = MultiVectorFactory::Build(rcpB->getMap(), rcpB->getNumVectors());
288 
289  // extract parameters from internal parameter list
290  const ParameterList & pL = Factory::GetParameterList();
291  LocalOrdinal nSweeps = pL.get<LocalOrdinal>("Sweeps");
292  Scalar omega = pL.get<Scalar>("Damping factor");
293 
294 
295  // Clear solution from previos V cycles in case it is still stored
296  if( InitialGuessIsZero==true )
297  rcpX->putScalar(Teuchos::ScalarTraits<Scalar>::zero());
298 
299 
300  // outer Richardson loop
301  for (LocalOrdinal run = 0; run < nSweeps; ++run) {
302  // one BGS sweep
303  // loop over all block rows
304  for(size_t i = 0; i<Inverse_.size(); i++) {
305 
306  // calculate block residual r = B-A*X
307  // note: A_ is the full blocked operator
308  residual->update(1.0,*rcpB,0.0); // r = B
309  if(InitialGuessIsZero == false || i > 0 || run > 0)
310  bA->bgs_apply(*rcpX, *residual, i, Teuchos::NO_TRANS, -1.0, 1.0);
311 
312  // extract corresponding subvectors from X and residual
313  bool bRangeThyraMode = rangeMapExtractor_->getThyraMode();
314  bool bDomainThyraMode = domainMapExtractor_->getThyraMode();
315  Teuchos::RCP<MultiVector> Xi = domainMapExtractor_->ExtractVector(rcpX, i, bDomainThyraMode);
316  Teuchos::RCP<MultiVector> ri = rangeMapExtractor_->ExtractVector(residual, i, bRangeThyraMode);
317  Teuchos::RCP<MultiVector> tXi = domainMapExtractor_->getVector(i, X.getNumVectors(), bDomainThyraMode);
318 
319  // apply solver/smoother
320  Inverse_.at(i)->Apply(*tXi, *ri, false);
321 
322  // update vector
323  Xi->update(omega,*tXi,1.0); // X_{i+1} = X_i + omega \Delta X_i
324 
325  }
326  }
327 
328  if (bCopyResultX == true) {
329  RCP<MultiVector> Xmerged = bX->Merge();
330  X.update(one, *Xmerged, zero);
331  }
332  }
333 
334  template <class Scalar,class LocalOrdinal, class GlobalOrdinal, class Node>
335  RCP<MueLu::SmootherPrototype<Scalar, LocalOrdinal, GlobalOrdinal, Node> > BlockedGaussSeidelSmoother<Scalar, LocalOrdinal, GlobalOrdinal, Node>::Copy() const {
336  return rcp( new BlockedGaussSeidelSmoother(*this) );
337  }
338 
339  template <class Scalar,class LocalOrdinal, class GlobalOrdinal, class Node>
341  std::ostringstream out;
343  out << "{type = " << type_ << "}";
344  return out.str();
345  }
346 
347  template <class Scalar,class LocalOrdinal, class GlobalOrdinal, class Node>
348  void BlockedGaussSeidelSmoother<Scalar, LocalOrdinal, GlobalOrdinal, Node>::print(Teuchos::FancyOStream &out, const VerbLevel verbLevel) const {
350 
351  // extract parameters from internal parameter list
352  const ParameterList & pL = Factory::GetParameterList();
353  LocalOrdinal nSweeps = pL.get<LocalOrdinal>("Sweeps");
354  Scalar omega = pL.get<Scalar>("Damping factor");
355 
356  if (verbLevel & Parameters0) {
357  out0 << "Prec. type: " << type_ << " Sweeps: " << nSweeps << " damping: " << omega << std::endl;
358  }
359 
360  if (verbLevel & Debug) {
361  out0 << "IsSetup: " << Teuchos::toString(SmootherPrototype::IsSetup()) << std::endl;
362  }
363  }
364  template <class Scalar,class LocalOrdinal, class GlobalOrdinal, class Node>
366  // FIXME: This is a placeholder
367  return Teuchos::OrdinalTraits<size_t>::invalid();
368  }
369 
370 } // namespace MueLu
371 
372 #endif /* MUELU_BLOCKEDGAUSSSEIDELSMOOTHER_DEF_HPP_ */
Important warning messages (one line)
Exception indicating invalid cast attempted.
MueLu::DefaultLocalOrdinal LocalOrdinal
std::string toString(const T &what)
Little helper function to convert non-string types to strings.
bool IsSetup() const
Get the state of a smoother prototype.
Timer to be used in factories. Similar to Monitor but with additional timers.
size_t getNodeSmootherComplexity() const
Get a rough estimate of cost per iteration.
block Gauss-Seidel method for blocked matrices
Print additional debugging information.
Namespace for MueLu classes and methods.
std::string description() const
Return a simple one-line description of this object.
MueLu::DefaultScalar Scalar
void DeclareInput(Level &currentLevel) const
Input.
Class that holds all level-specific information.
Definition: MueLu_Level.hpp:99
void Setup(Level &currentLevel)
Setup routine In the Setup method the Inverse_ vector is filled with the corresponding SmootherBase o...
virtual const Teuchos::ParameterList & GetParameterList() const
RCP< const ParameterList > GetValidParameterList() const
Input.
std::vector< Teuchos::RCP< const FactoryManagerBase > > FactManager_
vector of factory managers
#define MUELU_DESCRIBE
Helper macro for implementing Describable::describe() for BaseClass objects.
Print class parameters.
void Apply(MultiVector &X, const MultiVector &B, bool InitialGuessIsZero=false) const
Apply the direct solver. Solves the linear system AX=B using the constructed solver.
void print(Teuchos::FancyOStream &out, const VerbLevel verbLevel=Default) const
Print the object with some verbosity level verbLevel to an FancyOStream object out.
Exception throws to report errors in the internal logical of the program.
#define MUELU_TEST_FOR_EXCEPTION(throw_exception_test, Exception, msg)
An exception safe way to call the method &#39;Level::SetFactoryManager()&#39;.
void AddFactoryManager(RCP< const FactoryManagerBase > FactManager, int pos)
Add a factory manager.
void DeclareInput(const std::string &ename, const FactoryBase *factory, const FactoryBase *requestedBy=NoFactory::get())
Callback from FactoryBase::CallDeclareInput() and FactoryBase::DeclareInput()
virtual std::string description() const
Return a simple one-line description of this object.