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Zoltan2_AlgSpectral.hpp
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45 #ifndef _ZOLTAN2_ALGSPECTRAL_HPP_
46 #define _ZOLTAN2_ALGSPECTRAL_HPP_
47 
48 #include <Zoltan2_Algorithm.hpp>
49 #include <Zoltan2_GraphModel.hpp>
51 
52 
57 
58 
59 namespace Zoltan2{
60 
61 template <typename Adapter>
63  const RCP<GraphModel<Adapter> > &model,
64  //const RCP<Adapter> &matrixadapter, // Hack: Use matrix adapter directly
65 
66  // TO DO - update this algorithm to have the proper formatting like
67  // the others.
69  &solution,
70  const RCP<Teuchos::ParameterList> &pl,
71  const RCP<const Teuchos::Comm<int> > &comm
72 )
73 {
74 #ifndef INCLUDE_ZOLTAN2_EXPERIMENTAL
75 
76  Z2_THROW_EXPERIMENTAL("Zoltan2 Spectral ordering is strictly "
77  "experimental software "
78  "while it is being developed and tested.")
79 
80 #else //INCLUDE_ZOLTAN2_EXPERIMENTAL
81 
82  typedef typename Adapter::lno_t lno_t;
83  typedef typename Adapter::gno_t gno_t;
84  typedef typename Adapter::offset_t offset_t;
85  typedef typename Adapter::scalar_t scalar_t;
86 
87  int ierr= 0;
88 
89  HELLO;
90 
91 // TODO: Check params to do local or global ordering.
92  bool localOrder = true;
93 
94  const size_t nVtx = model->getLocalNumVertices();
95  lno_t *perm = solution->getPermutationView();
96  for (lno_t i=0; i<nVtx; i++){
97  perm[i] = -1;
98  }
99 
100  // Get local graph.
101  ArrayView<const gno_t> edgeIds;
102  ArrayView<const offset_t> offsets;
103  ArrayView<StridedData<lno_t, scalar_t> > wgts;
104 
105  model->getEdgeList(edgeIds, offsets, wgts);
106 
107  //cout << "Debug: Local graph from getLocalEdgeList" << endl;
108  //cout << "edgeIds: " << edgeIds << endl;
109  //cout << "offsets: " << offsets << endl;
110 
111  // Form the graph Laplacian: L = D-A
112  // Create a new Tpetra matrix, but use views of existing data when possible.
113  // TODO
114 
115  // TODO: Find smallest eigenvalues using Anasazi
116 
117  // TODO: Sort Fiedler vector.
118 
119  solution->setHavePerm(true);
120  return ierr;
121 #endif // INCLUDE_ZOLTAN2_EXPERIMENTAL
122 }
123 
124 }
125 #endif
#define HELLO
Defines the OrderingSolution class.
int AlgSpectral(const RCP< GraphModel< Adapter > > &model, const RCP< LocalOrderingSolution< typename Adapter::lno_t > > &solution, const RCP< Teuchos::ParameterList > &pl, const RCP< const Teuchos::Comm< int > > &comm)
#define Z2_THROW_EXPERIMENTAL(mystr)
Throw an error when experimental code is requested but not compiled.
GraphModel defines the interface required for graph models.
Defines the GraphModel interface.