Java Variable类代码示例

import cc.mallet.grmm.types.Variable; //导入依赖的package包/类
public Factor lookupMarginal (JunctionTree jt, Variable var)
{
  if (jt == null) { throw new IllegalStateException ("Call computeMarginals() first."); }

  VarSet parent = jt.findParentCluster (var);
  Factor cpf = jt.getCPF (parent);
  if (logger.isLoggable (Level.FINER)) {
    logger.finer ("Lookup jt marginal: var " + var + " cluster " + parent);
    logger.finest (" cpf " + cpf);
  }

  Factor marginal = strategy.extractBelief (cpf, new HashVarSet (new Variable[] { var }));
  marginal.normalize ();

  return marginal;
}
 

import cc.mallet.grmm.types.Variable; //导入依赖的package包/类
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);
  return regions;
}
 

import cc.mallet.grmm.types.Variable; //导入依赖的package包/类
/**
 * Converts a FactorGraph into a plain graph where each Variable is a vertex,
 * and two Variables are connected by an edge if they are arguments to the same factor. 
 *  (Essentially converts an fg into an MRF structure, minus the factors.)
 * @param fg
 * @return a Graph
 */
public static UndirectedGraph mdlToGraph (FactorGraph fg)
{
  UndirectedGraph g = new SimpleGraph ();

  for (Iterator it = fg.variablesIterator (); it.hasNext ();) {
    Variable var = (Variable) it.next ();
    g.addVertex (var);
  }

  for (Iterator it = fg.factorsIterator (); it.hasNext ();) {
    Factor factor = (Factor) it.next ();
    VarSet varSet = factor.varSet ();
    int nv = varSet.size ();
    for (int i = 0; i < nv; i++) {
      for (int j = i + 1; j < nv; j++) {
        g.addEdge (varSet.get (i), varSet.get (j));
      }
    }
  }

  return g;
}
 

import cc.mallet.grmm.types.Variable; //导入依赖的package包/类
private void setupLabel2Var ()
{
  idx2var = new Variable [lblseq.size ()][];
  var2label = new THashMap ();
  for (int t = 0; t < lblseq.size (); t++) {
    Labels lbls = lblseq.getLabels (t);
    idx2var[t] = new Variable [lbls.size ()];
    for (int j = 0; j < lbls.size (); j++) {
      Label lbl = lbls.get (j);
      Variable var = new Variable (lbl.getLabelAlphabet ());
      var.setLabel ("I"+id+"_VAR[f=" + j + "][tm=" + t + "]");
      idx2var[t][j] = var;
      var2label.put (var, lbl);
    }
  }
}
 

import cc.mallet.grmm.types.Variable; //导入依赖的package包/类
public LabelsSequence toLabelsSequence (Assignment assn)
{
  int numFactors = numSlices ();
  int maxTime = maxTime ();
  Labels[] lbls = new Labels [maxTime];
  for (int t = 0; t < maxTime; t++) {
    Label[] theseLabels = new Label [numFactors];
    for (int i = 0; i < numFactors; i++) {
      Variable var = varOfIndex (t, i);
      int maxidx;

      if (var != null) {
        maxidx = assn.get (var);
      } else {
        maxidx = 0;
      }

      LabelAlphabet dict = labelOfVar (var).getLabelAlphabet ();
      theseLabels[i] = dict.lookupLabel (maxidx);
    }

    lbls[t] = new Labels (theseLabels);
  }

  return new LabelsSequence (lbls);
}
 

import cc.mallet.grmm.types.Variable; //导入依赖的package包/类
public void testInitialAssignment ()
{
  Variable[] vars = new Variable[] { new Variable (3), new Variable (3), new Variable (3) };

  Variable[] vars1 = new Variable[]{ vars[0], vars[1] };
  double[] vals1 = new double[] { 0, 0.2, 0.8, 0, 0.7, 0.3, 0, 0.5, 0.5 };
  Factor tbl1 = new TableFactor (vars1, vals1);

  Variable[] vars2 = new Variable[]{ vars[1], vars[2] };
  double[] vals2 = new double[] { 0.2, 0.2, 0.8, 0.7, 0, 0.7, 0.3, 0, 0.5 };
  Factor tbl2 = new TableFactor (vars2, vals2);

  FactorGraph fg = new FactorGraph ();
  fg.multiplyBy (tbl1);
  fg.multiplyBy (tbl2);
  System.out.println (fg.dumpToString ());

  GibbsSampler gs = new GibbsSampler (new Randoms (324123), 10);
  gs.sample (fg, 10);  // assert no exception
}
 

import cc.mallet.grmm.types.Variable; //导入依赖的package包/类
/**
 * Converts a FactorGraph into a plain graph where each Variable is a vertex,
 * and two Variables are connected by an edge if they are arguments to the same factor. 
 *  (Essentially converts an fg into an MRF structure, minus the factors.)
 * @param fg
 * @return a Graph
 */
public static UndirectedGraph mdlToGraph (FactorGraph fg)
{
  UndirectedGraph g = new SimpleGraph(DefaultEdge.class);

  for (Iterator it = fg.variablesIterator (); it.hasNext ();) {
    Variable var = (Variable) it.next ();
    g.addVertex (var);
  }

  for (Iterator it = fg.factorsIterator (); it.hasNext ();) {
    Factor factor = (Factor) it.next ();
    VarSet varSet = factor.varSet ();
    int nv = varSet.size ();
    for (int i = 0; i < nv; i++) {
      for (int j = i + 1; j < nv; j++) {
        g.addEdge (varSet.get (i), varSet.get (j));
      }
    }
  }

  return g;
}
 

import cc.mallet.grmm.types.Variable; //导入依赖的package包/类
private void setupLabel2Var ()
{
  idx2var = new Variable [lblseq.size ()][];
  var2label = new THashMap();
  for (int t = 0; t < lblseq.size (); t++) {
    Labels lbls = lblseq.getLabels (t);
    idx2var[t] = new Variable [lbls.size ()];
    for (int j = 0; j < lbls.size (); j++) {
      Label lbl = lbls.get (j);
      Variable var = new Variable (lbl.getLabelAlphabet ());
      var.setLabel ("I"+id+"_VAR[f=" + j + "][tm=" + t + "]");
      idx2var[t][j] = var;
      var2label.put (var, lbl);
    }
  }
}
 

import cc.mallet.grmm.types.Variable; //导入依赖的package包/类
private void setupLabel2Var ()
{
  idx2var = new Variable [lblseq.size ()][];
  var2label = new HashMap();
  for (int t = 0; t < lblseq.size (); t++) {
    Labels lbls = lblseq.getLabels (t);
    idx2var[t] = new Variable [lbls.size ()];
    for (int j = 0; j < lbls.size (); j++) {
      Label lbl = lbls.get (j);
      Variable var = new Variable (lbl.getLabelAlphabet ());
      var.setLabel ("I"+id+"_VAR[f=" + j + "][tm=" + t + "]");
      idx2var[t][j] = var;
      var2label.put (var, lbl);
    }
  }
}