Java ArrayUtils类代码示例

import cc.mallet.util.ArrayUtils; //导入依赖的package包/类
public void testSample ()
{
  Variable v = new Variable (3);
  double[] vals = new double[] { 1, 3, 2 };
  TableFactor ptl = new TableFactor (v, vals);
  int[] sampled = new int [100];

  Randoms r = new Randoms (32423);
  for (int i = 0; i < sampled.length; i++) {
    sampled[i] = ptl.sampleLocation (r);
  }

  double sum = MatrixOps.sum (vals);
  double[] counts = new double [vals.length];
  for (int i = 0; i < vals.length; i++) {
    counts[i] = ArrayUtils.count (sampled, i);
  }

  MatrixOps.print (counts);
  for (int i = 0; i < vals.length; i++) {
    double prp = counts[i] / ((double) sampled.length);
    assertEquals (vals[i] / sum, prp, 0.1);
  }
}
 

import cc.mallet.util.ArrayUtils; //导入依赖的package包/类
/**
 * Tests that models can be created that have multiple factors over the same variable, and that
 * potentialOfVertex returns the product in that case.
 */
public void testMultipleNodePotentials ()
{
  Variable var = new Variable (2);
  FactorGraph mdl = new FactorGraph (new Variable[]{var});

  Factor ptl1 = new TableFactor (var, new double[]{0.5, 0.5});
  mdl.addFactor (ptl1);

  Factor ptl2 = new TableFactor (var, new double[]{0.25, 0.25});
  mdl.addFactor (ptl2);

  // verify that factorOf(var) doesn't work
  try {
    mdl.factorOf (var);
    fail ();
  } catch (RuntimeException e) {} // expected

  List factors = mdl.allFactorsOf (var);
  Factor total = TableFactor.multiplyAll (factors);
  double[] expected = {0.125, 0.125};
  assertTrue ("Arrays not equal\n  Expected " + ArrayUtils.toString (expected)
          + "\n  Actual " + ArrayUtils.toString (((TableFactor) total).toValueArray ()),
              Arrays.equals (expected, ((TableFactor) total).toValueArray ()));
}
 

import cc.mallet.util.ArrayUtils; //导入依赖的package包/类
private void checkAllSingles (RegionGraph rg, Region[] nodeRegions)
{
  for (Iterator it = rg.iterator (); it.hasNext ();) {
    Region region = (Region) it.next ();
    if (region.vars.size() == 1) {
      if (ArrayUtils.indexOf (nodeRegions, region) < 0) {
        throw new IllegalStateException ("huh?");
      }
    }
  }
}
 

import cc.mallet.util.ArrayUtils; //导入依赖的package包/类
public void testMarginalize ()
{
  Variable[] vars = new Variable[] { new Variable (2), new Variable (2) };
  TableFactor ptl = new TableFactor (vars, new double[] { 1, 2, 3, 4});
  TableFactor ptl2 = (TableFactor) ptl.marginalize (vars[1]);
  assertEquals ("FAILURE: Potential has too many vars.\n  "+ptl2, 1, ptl2.varSet ().size ());
  assertTrue ("FAILURE: Potential does not contain "+vars[1]+":\n  "+ptl2, ptl2.varSet ().contains (vars[1]));

  double[] expected = new double[] { 4, 6 };
  assertTrue ("FAILURE: Potential has incorrect values.  Expected "+ArrayUtils.toString (expected)+"was "+ptl2,
        Maths.almostEquals (ptl2.toValueArray (), expected, 1e-5));
}
 

import cc.mallet.util.ArrayUtils; //导入依赖的package包/类
public void testMarginalizeOut ()
{
  Variable[] vars = new Variable[] { new Variable (2), new Variable (2) };
  TableFactor ptl = new TableFactor (vars, new double[] { 1, 2, 3, 4});
  TableFactor ptl2 = (TableFactor) ptl.marginalizeOut (vars[0]);
  assertEquals ("FAILURE: Potential has too many vars.\n  "+ptl2, 1, ptl2.varSet ().size ());
  assertTrue ("FAILURE: Potential does not contain "+vars[1]+":\n  "+ptl2, ptl2.varSet ().contains (vars[1]));

  double[] expected = new double[] { 4, 6 };
  assertTrue ("FAILURE: Potential has incorrect values.  Expected "+ArrayUtils.toString (expected)+"was "+ptl2,
        Maths.almostEquals (ptl2.toValueArray (), expected, 1e-5));
}
 

import cc.mallet.util.ArrayUtils; //导入依赖的package包/类
public void testExtractMaxLogSpace ()
{
  Variable[] vars = new Variable[] { new Variable (2), new Variable (2) };
  LogTableFactor ptl = LogTableFactor.makeFromValues (vars, new double[]{1, 2, 3, 4});
  LogTableFactor ptl2 = (LogTableFactor) ptl.extractMax (vars[1]);

  assertEquals ("FAILURE: Potential has too many vars.\n  "+ptl2, 1, ptl2.varSet ().size ());
  assertTrue ("FAILURE: Potential does not contain "+vars[1]+":\n  "+ptl2, ptl2.varSet ().contains (vars[1]));

  double[] expected = new double[] { 3, 4 };
  assertTrue ("FAILURE: Potential has incorrect values.  Expected "+ArrayUtils.toString (expected)+"was "+ptl2,
        Maths.almostEquals (ptl2.toValueArray (), expected, 1e-5));
}
 

import cc.mallet.util.ArrayUtils; //导入依赖的package包/类
/**
 * Tests that models can be created that have multiple factors over the same edge, and that
 * potentialOfEdge returns the product in that case.
 */
public void testMultipleEdgePotentials ()
{
  Variable v1 = new Variable (2);
  Variable v2 = new Variable (2);
  Variable[] vars = new Variable[]{v1, v2};

  FactorGraph mdl = new FactorGraph (vars);

  Factor ptl1 = new TableFactor (vars, new double[]{0.5, 0.5, 0.5, 0.5});
  mdl.addFactor (ptl1);

  Factor ptl2 = new TableFactor (vars, new double[]{0.25, 0.25, 0.5, 0.5});
  mdl.addFactor (ptl2);

  try {
    mdl.factorOf (v1, v2);
    fail ();
  } catch (RuntimeException e) {}

  Collection factors = mdl.allFactorsContaining (new HashVarSet (vars));
  assertEquals (2, factors.size ());
  assertTrue (factors.contains (ptl1));
  assertTrue (factors.contains (ptl2));

  double[] vals = {0.125, 0.125, 0.25, 0.25};
  Factor total = TableFactor.multiplyAll (factors);
  Factor expected = new TableFactor (vars, vals);

  assertTrue ("Arrays not equal\n  Expected " + ArrayUtils.toString (vals)
          + "\n  Actual " + ArrayUtils.toString (((TableFactor) total).toValueArray ()),
              expected.almostEquals (total, 1e-10));
}
 

import cc.mallet.util.ArrayUtils; //导入依赖的package包/类
public int getWeightsIndex (String weightName)
{
	int wi = parameters.weightAlphabet.lookupIndex (weightName);
	if (wi == -1)
		throw new IllegalArgumentException ("Alphabet frozen, and no weight with name "+ weightName);
	if (parameters.weights == null) {
		assert (wi == 0);
		parameters.weights = new SparseVector[1];
		parameters.defaultWeights = new double[1];
		featureSelections = new FeatureSelection[1];
		parameters.weightsFrozen = new boolean [1];
		// Use initial capacity of 8
		parameters.weights[0] = new IndexedSparseVector ();
		parameters.defaultWeights[0] = 0;
		featureSelections[0] = null;
		weightsStructureChanged();
	} else if (wi == parameters.weights.length) {
		SparseVector[] newWeights = new SparseVector[parameters.weights.length+1];
		double[] newDefaultWeights = new double[parameters.weights.length+1];
		FeatureSelection[] newFeatureSelections = new FeatureSelection[parameters.weights.length+1];
		for (int i = 0; i < parameters.weights.length; i++) {
			newWeights[i] = parameters.weights[i];
			newDefaultWeights[i] = parameters.defaultWeights[i];
			newFeatureSelections[i] = featureSelections[i];
		}
		newWeights[wi] = new IndexedSparseVector ();
		newDefaultWeights[wi] = 0;
		newFeatureSelections[wi] = null;
		parameters.weights = newWeights;
		parameters.defaultWeights = newDefaultWeights;
		featureSelections = newFeatureSelections;
		parameters.weightsFrozen = ArrayUtils.append (parameters.weightsFrozen, false);
		weightsStructureChanged();
	}
	//setTrainable (false);
	return wi;
}
 

import cc.mallet.util.ArrayUtils; //导入依赖的package包/类
/**
 *
 * @param original
 * @param modified
 * @param cluster1 Instance indices for one cluster that was merged.
 * @param cluster2 Instance indices for other cluster that was merged.
 * @return
 */
public AgglomerativeNeighbor (Clustering original,
															Clustering modified,
															int[][] oldClusters) {
	super(original, modified);
	if (oldClusters.length != 2)
		throw new IllegalArgumentException("Agglomerations of more than 2 clusters not yet implemented.");
	this.oldClusters = oldClusters;
	this.newCluster = ArrayUtils.append(oldClusters[0], oldClusters[1]);	
}