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MueLu_UnsmooshFactory_def.hpp
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47 #ifndef PACKAGES_MUELU_SRC_GRAPH_MUELU_UNSMOOSHFACTORY_DEF_HPP_
48 #define PACKAGES_MUELU_SRC_GRAPH_MUELU_UNSMOOSHFACTORY_DEF_HPP_
49 
50 #include "MueLu_Monitor.hpp"
51 
53 
54 namespace MueLu {
55 
56  template <class Scalar,class LocalOrdinal, class GlobalOrdinal, class Node>
58 
59  template <class Scalar, class LocalOrdinal, class GlobalOrdinal, class Node>
61  RCP<ParameterList> validParamList = rcp(new ParameterList());
62  validParamList->set< RCP<const FactoryBase> >("A", Teuchos::null, "Generating factory for unamalgamated matrix. Row map of (unamalgamted) output prolongation operator should match row map of this A.");
63  validParamList->set< RCP<const FactoryBase> >("P", Teuchos::null, "Generating factory of the (amalgamated) prolongator P");
64  validParamList->set< RCP<const FactoryBase> >("DofStatus", Teuchos::null, "Generating factory for dofStatus array (usually the VariableDofLaplacdianFactory)");
65 
66  validParamList->set< int > ("maxDofPerNode", 1, "Maximum number of DOFs per node");
67  validParamList->set< bool > ("fineIsPadded" , false, "true if finest level input matrix is padded");
68 
69  return validParamList;
70  }
71 
72  template <class Scalar,class LocalOrdinal, class GlobalOrdinal, class Node>
74  //const ParameterList& pL = GetParameterList();
75  Input(fineLevel, "A");
76  Input(coarseLevel, "P");
77 
78  // DofStatus only provided on the finest level (by user)
79  // On the coarser levels it is auto-generated using the DBC information from the unamalgamated matrix A
80  if(fineLevel.GetLevelID() == 0)
81  Input(fineLevel, "DofStatus");
82  }
83 
84  template <class Scalar,class LocalOrdinal, class GlobalOrdinal, class Node>
86  FactoryMonitor m(*this, "Build", coarseLevel);
87  typedef Teuchos::ScalarTraits<SC> STS;
88 
89  const ParameterList & pL = GetParameterList();
90 
91  // extract matrices (unamalgamated A and amalgamated P)
92  RCP<Matrix> unamalgA = Get< RCP<Matrix> >(fineLevel, "A");
93  RCP<Matrix> amalgP = Get< RCP<Matrix> >(coarseLevel, "P");
94 
95  // extract user parameters
96  int maxDofPerNode = pL.get<int> ("maxDofPerNode");
97  bool fineIsPadded = pL.get<bool>("fineIsPadded");
98 
99  // get dofStatus information
100  // On the finest level it is provided by the user. On the coarser levels it is constructed
101  // using the DBC information of the matrix A
102  Teuchos::Array<char> dofStatus;
103  if(fineLevel.GetLevelID() == 0) {
104  dofStatus = Get<Teuchos::Array<char> >(fineLevel, "DofStatus");
105  } else {
106  // dof status is the dirichlet information of unsmooshed/unamalgamated A (fine level)
107  dofStatus = Teuchos::Array<char>(unamalgA->getRowMap()->getNodeNumElements() /*amalgP->getRowMap()->getNodeNumElements() * maxDofPerNode*/,'s');
108 
109  bool bHasZeroDiagonal = false;
111 
112  TEUCHOS_TEST_FOR_EXCEPTION(dirOrNot.size() != dofStatus.size(), MueLu::Exceptions::RuntimeError,"MueLu::UnsmooshFactory::Build: inconsistent number of coarse DBC array and dofStatus array. dirOrNot.size() = " << dirOrNot.size() << " dofStatus.size() = " << dofStatus.size());
113  for(decltype(dirOrNot.size()) i = 0; i < dirOrNot.size(); ++i) {
114  if(dirOrNot[i] == true) dofStatus[i] = 'p';
115  }
116  }
117 
118  // TODO: TAW the following check is invalid for SA-AMG based input prolongators
119  //TEUCHOS_TEST_FOR_EXCEPTION(amalgP->getDomainMap()->isSameAs(*amalgP->getColMap()) == false, MueLu::Exceptions::RuntimeError,"MueLu::UnsmooshFactory::Build: only support for non-overlapping aggregates. (column map of Ptent must be the same as domain map of Ptent)");
120 
121  // extract CRS information from amalgamated prolongation operator
122  Teuchos::ArrayRCP<const size_t> amalgRowPtr(amalgP->getNodeNumRows());
123  Teuchos::ArrayRCP<const LocalOrdinal> amalgCols(amalgP->getNodeNumEntries());
124  Teuchos::ArrayRCP<const Scalar> amalgVals(amalgP->getNodeNumEntries());
125  Teuchos::RCP<CrsMatrixWrap> amalgPwrap = Teuchos::rcp_dynamic_cast<CrsMatrixWrap>(amalgP);
126  Teuchos::RCP<CrsMatrix> amalgPcrs = amalgPwrap->getCrsMatrix();
127  amalgPcrs->getAllValues(amalgRowPtr, amalgCols, amalgVals);
128 
129  // calculate number of dof rows for new prolongator
130  size_t paddedNrows = amalgP->getRowMap()->getNodeNumElements() * Teuchos::as<size_t>(maxDofPerNode);
131 
132  // reserve CSR arrays for new prolongation operator
133  Teuchos::ArrayRCP<size_t> newPRowPtr(paddedNrows+1);
134  Teuchos::ArrayRCP<LocalOrdinal> newPCols(amalgP->getNodeNumEntries() * maxDofPerNode);
135  Teuchos::ArrayRCP<Scalar> newPVals(amalgP->getNodeNumEntries() * maxDofPerNode);
136 
137  size_t rowCount = 0; // actual number of (local) in unamalgamated prolongator
138  if(fineIsPadded == true || fineLevel.GetLevelID() > 0) {
139 
140  // build prolongation operator for padded fine level matrices.
141  // Note: padded fine level dofs are transferred by injection.
142  // That is, these interpolation stencils do not take averages of
143  // coarse level variables. Further, fine level Dirichlet points
144  // also use injection.
145 
146  size_t cnt = 0; // local id counter
147  for (decltype(amalgRowPtr.size()) i = 0; i < amalgRowPtr.size() - 1; i++) {
148  // determine number of entries in amalgamated dof row i
149  size_t rowLength = amalgRowPtr[i+1] - amalgRowPtr[i];
150 
151  // loop over dofs per node (unamalgamation)
152  for(int j = 0; j < maxDofPerNode; j++) {
153  newPRowPtr[i*maxDofPerNode+j] = cnt;
154  if (dofStatus[i*maxDofPerNode+j] == 's') { // add only "standard" dofs to unamalgamated prolongator
155  // loop over column entries in amalgamated P
156  for (size_t k = 0; k < rowLength; k++) {
157  newPCols[cnt ] = amalgCols[k+amalgRowPtr[i]] * maxDofPerNode + j;
158  newPVals[cnt++] = amalgVals[k+amalgRowPtr[i]];
159  }
160 
161  }
162  }
163  }
164 
165  newPRowPtr[paddedNrows] = cnt; // close row CSR array
166  rowCount = paddedNrows;
167  } else {
168  // Build prolongation operator for non-padded fine level matrices.
169  // Need to map from non-padded dofs to padded dofs. For this, look
170  // at the status array and skip padded dofs.
171 
172  size_t cnt = 0; // local id counter
173 
174  for (decltype(amalgRowPtr.size()) i = 0; i < amalgRowPtr.size() - 1; i++) {
175  // determine number of entries in amalgamated dof row i
176  size_t rowLength = amalgRowPtr[i+1] - amalgRowPtr[i];
177 
178  // loop over dofs per node (unamalgamation)
179  for(int j = 0; j < maxDofPerNode; j++) {
180  // no interpolation for padded fine dofs as they do not exist
181 
182  if (dofStatus[i*maxDofPerNode+j] == 's') { // add only "standard" dofs to unamalgamated prolongator
183  newPRowPtr[rowCount++] = cnt;
184  // loop over column entries in amalgamated P
185  for (size_t k = 0; k < rowLength; k++) {
186  newPCols[cnt ] = amalgCols[k+amalgRowPtr[i]] * maxDofPerNode + j;
187  newPVals[cnt++] = amalgVals[k+amalgRowPtr[i]];
188  }
189 
190  }
191  if (dofStatus[i*maxDofPerNode+j] == 'd') { // Dirichlet handling
192  newPRowPtr[rowCount++] = cnt;
193  }
194  }
195  }
196  newPRowPtr[rowCount] = cnt; // close row CSR array
197  } // fineIsPadded == false
198 
199  // generate coarse domain map
200  // So far no support for gid offset or strided maps. This information
201  // could be gathered easily from the unamalgamated fine level operator A.
202  std::vector<size_t> stridingInfo(1,maxDofPerNode);
203 
204  GlobalOrdinal nCoarseDofs = amalgP->getDomainMap()->getNodeNumElements() * maxDofPerNode;
205  GlobalOrdinal indexBase = amalgP->getDomainMap()->getIndexBase();
206  RCP<const Map> coarseDomainMap = StridedMapFactory::Build(amalgP->getDomainMap()->lib(),
208  nCoarseDofs,
209  indexBase,
210  stridingInfo,
211  amalgP->getDomainMap()->getComm(),
212  -1 /* stridedBlockId */,
213  0 /*domainGidOffset */);
214 
215  size_t nColCoarseDofs = Teuchos::as<size_t>(amalgP->getColMap()->getNodeNumElements() * maxDofPerNode);
216  Teuchos::Array<GlobalOrdinal> unsmooshColMapGIDs(nColCoarseDofs);
217  for(size_t c = 0; c < amalgP->getColMap()->getNodeNumElements(); ++c) {
218  GlobalOrdinal gid = (amalgP->getColMap()->getGlobalElement(c)-indexBase) * maxDofPerNode + indexBase;
219 
220  for(int i = 0; i < maxDofPerNode; ++i) {
221  unsmooshColMapGIDs[c * maxDofPerNode + i] = gid + i;
222  }
223  }
224  Teuchos::RCP<Map> coarseColMap = MapFactory::Build(amalgP->getDomainMap()->lib(),
226  unsmooshColMapGIDs(), //View,
227  indexBase,
228  amalgP->getDomainMap()->getComm());
229 
230  // Assemble unamalgamated P
231  Teuchos::RCP<CrsMatrix> unamalgPCrs = CrsMatrixFactory::Build(unamalgA->getRowMap(),coarseColMap, 3);
232  for (decltype(rowCount) i = 0; i < rowCount; i++) {
233  unamalgPCrs->insertLocalValues(i, newPCols.view(newPRowPtr[i],newPRowPtr[i+1]-newPRowPtr[i]),
234  newPVals.view(newPRowPtr[i],newPRowPtr[i+1]-newPRowPtr[i]));
235  }
236  unamalgPCrs->fillComplete(coarseDomainMap,unamalgA->getRowMap());
237 
238  Teuchos::RCP<Matrix> unamalgP = Teuchos::rcp(new CrsMatrixWrap(unamalgPCrs));
239 
240  Set(coarseLevel,"P",unamalgP);
241  }
242 
243 
244 } /* MueLu */
245 
246 
247 #endif /* PACKAGES_MUELU_SRC_GRAPH_MUELU_UNSMOOSHFACTORY_DEF_HPP_ */
T & get(const std::string &name, T def_value)
ParameterList & set(std::string const &name, T const &value, std::string const &docString="", RCP< const ParameterEntryValidator > const &validator=null)
Timer to be used in factories. Similar to Monitor but with additional timers.
#define TEUCHOS_TEST_FOR_EXCEPTION(throw_exception_test, Exception, msg)
size_type size() const
void Build(Level &fineLevel, Level &coarseLevel) const
Build an object with this factory.
TEUCHOS_DEPRECATED RCP< T > rcp(T *p, Dealloc_T dealloc, bool owns_mem)
void DeclareInput(Level &fineLevel, Level &coarseLevel) const
Input.
Class that holds all level-specific information.
Definition: MueLu_Level.hpp:99
static Teuchos::ArrayRCP< const bool > DetectDirichletRowsExt(const Xpetra::Matrix< Scalar, LocalOrdinal, GlobalOrdinal, Node > &A, bool &bHasZeroDiagonal, const Magnitude &tol=Teuchos::ScalarTraits< Scalar >::zero())
int GetLevelID() const
Return level number.
Definition: MueLu_Level.cpp:76
Exception throws to report errors in the internal logical of the program.
RCP< const ParameterList > GetValidParameterList() const
Return a const parameter list of valid parameters that setParameterList() will accept.