Examples of UndirectedGrid

A grid-shaped undirected graphical model. All this adds to the base UndirectedModel class is the ability to retrieve variables by their (x,y) position. Created: Mar 28, 2005 @author

Examples of cc.mallet.grmm.types.UndirectedGrid

  public RegionGraph constructRegionGraph (FactorGraph mdl)
  {
    if (mdl instanceof UndirectedGrid) {
      RegionGraph rg = new RegionGraph ();


      UndirectedGrid grid = (UndirectedGrid) mdl;


      // First set up regions for all
      for (int x = 0; x < grid.getWidth () - 1; x++) {
        for (int y = 0; y < grid.getHeight () - 1; y++) {
          Variable[] vars = new Variable[] {
           grid.get (x, y),
           grid.get (x+1, y),
           grid.get (x+1, y+1),
           grid.get (x, y+1), };


          Factor[] edges = new Factor[] {
            mdl.factorOf (vars[0], vars[1]),
           mdl.factorOf (vars[1], vars[2]),
           mdl.factorOf (vars[2], vars[3]),

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Examples of cc.mallet.grmm.types.UndirectedGrid

  public static class Grid2x2RegionComputer implements BaseRegionComputer {


    public List computeBaseRegions (FactorGraph mdl)
    {
      List regions = new ArrayList ();
      UndirectedGrid grid = (UndirectedGrid) mdl;
      for (int x = 0; x < grid.getWidth() - 1; x++) {
        for (int y = 0; y < grid.getHeight() - 1; y++) {
          Variable[] vars = new Variable[] {
            grid.get (x, y),
            grid.get (x, y+1),
            grid.get (x+1, y+1),
            grid.get (x+1, y),
          };
          regions.add (new Region (vars, new Factor[0]));
        }
      }
      addAllFactors (mdl, regions);

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