Java Pipe.getTargetAlphabet方法代码示例

import cc.mallet.pipe.Pipe; //导入方法依赖的package包/类
public CRF (Pipe inputPipe, Pipe outputPipe)
{
	super (inputPipe, outputPipe);
	this.inputAlphabet = inputPipe.getDataAlphabet();
	this.outputAlphabet = inputPipe.getTargetAlphabet();
	//inputAlphabet.stopGrowth();
}
 

import cc.mallet.pipe.Pipe; //导入方法依赖的package包/类
public void testTokenAccuracy() {
	Pipe p = makeSpacePredictionPipe();

	InstanceList instances = new InstanceList(p);
	instances.addThruPipe(new ArrayIterator(data));
	InstanceList[] lists = instances.split(new Random(777), new double[] {
			.5, .5 });

	CRF crf = new CRF(p.getDataAlphabet(), p.getTargetAlphabet());
	crf.addFullyConnectedStatesForLabels();
	CRFTrainerByLabelLikelihood crft = new CRFTrainerByLabelLikelihood(crf);
	crft.setUseSparseWeights(true);

	crft.trainIncremental(lists[0]);

	TokenAccuracyEvaluator eval = new TokenAccuracyEvaluator(lists,
			new String[] { "Train", "Test" });
	eval.evaluateInstanceList(crft, lists[1], "Test");

	assertEquals(0.9409, eval.getAccuracy("Test"), 0.001);

}
 

import cc.mallet.pipe.Pipe; //导入方法依赖的package包/类
/** Creates a PagedInstanceList where "instancesPerPage" instances
 * are swapped to disk in directory "swapDir" if the amount of free
 * system memory drops below "minFreeMemory" bytes
 * @param pipe instance pipe
 * @param numPages number of pages to keep in memory
 * @param instancesPerPage number of Instances to store in each page
 * @param swapDir where the pages on disk live.
 */
public PagedInstanceList (Pipe pipe, int numPages, int instancesPerPage, File swapDir) {
    super (pipe, numPages * instancesPerPage);
    this.instancesPerPage = instancesPerPage;
    this.swapDir = swapDir;
    this.inMemoryPageIds = new int[numPages];
    this.inMemoryPages = new InstanceList[numPages];
    this.noopPipe = new Noop(pipe.getDataAlphabet(), pipe.getTargetAlphabet());
    for (int i = 0; i < numPages; i++) {
        this.inMemoryPageIds[i] = -1;
    }

    try {
        if (!swapDir.exists()) {
            swapDir.mkdir();
        }
    } catch (SecurityException e) {
        System.err.println ("No permission to make directory " + swapDir);
        System.exit(-1);
    }
}
 

import cc.mallet.pipe.Pipe; //导入方法依赖的package包/类
private void resolveAlphabets ()
{
	Alphabet da = null, ta = null;
	for (Pipe p : pipes) {
		p.preceedingPipeDataAlphabetNotification(da);
		da = p.getDataAlphabet();
		p.preceedingPipeTargetAlphabetNotification(ta);
		ta = p.getTargetAlphabet();
	}
	dataAlphabet = da;
	targetAlphabet = ta;
}
 

import cc.mallet.pipe.Pipe; //导入方法依赖的package包/类
public HMM(Pipe inputPipe, Pipe outputPipe) {
	this.inputPipe = inputPipe;
	this.outputPipe = outputPipe;
	this.inputAlphabet = inputPipe.getDataAlphabet();
	this.outputAlphabet = inputPipe.getTargetAlphabet();
}
 

import cc.mallet.pipe.Pipe; //导入方法依赖的package包/类
public void testAddOrderNStates() {
	Pipe p = makeSpacePredictionPipe();

	InstanceList instances = new InstanceList(p);
	instances.addThruPipe(new ArrayIterator(data));
	InstanceList[] lists = instances.split(new java.util.Random(678),
			new double[] { .5, .5 });

	// Compare 3 CRFs trained with addOrderNStates, and make sure
	// that having more features leads to a higher likelihood

	CRF crf1 = new CRF(p.getDataAlphabet(), p.getTargetAlphabet());
	crf1.addOrderNStates(lists[0], new int[] { 1, },
			new boolean[] { false, }, "START", null, null, false);
	new CRFTrainerByLabelLikelihood(crf1).trainIncremental(lists[0]);

	CRF crf2 = new CRF(p.getDataAlphabet(), p.getTargetAlphabet());
	crf2.addOrderNStates(lists[0], new int[] { 1, 2, }, new boolean[] {
			false, true }, "START", null, null, false);
	new CRFTrainerByLabelLikelihood(crf2).trainIncremental(lists[0]);

	CRF crf3 = new CRF(p.getDataAlphabet(), p.getTargetAlphabet());
	crf3.addOrderNStates(lists[0], new int[] { 1, 2, }, new boolean[] {
			false, false }, "START", null, null, false);
	new CRFTrainerByLabelLikelihood(crf3).trainIncremental(lists[0]);

	// Prevent cached values
	double lik1 = getLikelihood(crf1, lists[0]);
	double lik2 = getLikelihood(crf2, lists[0]);
	double lik3 = getLikelihood(crf3, lists[0]);

	System.out.println("CRF1 likelihood " + lik1);

	assertTrue("Final zero-order likelihood <" + lik1
			+ "> greater than first-order <" + lik2 + ">", lik1 < lik2);
	assertTrue("Final defaults-only likelihood <" + lik2
			+ "> greater than full first-order <" + lik3 + ">", lik2 < lik3);

	assertEquals(-167.2234457483949, lik1, 0.0001);
	assertEquals(-165.81326484466342, lik2, 0.0001);
	assertEquals(-90.37680146432787, lik3, 0.0001);
}
 

import cc.mallet.pipe.Pipe; //导入方法依赖的package包/类
public void testFrozenWeights() {
	Pipe p = makeSpacePredictionPipe();

	InstanceList instances = new InstanceList(p);
	instances.addThruPipe(new ArrayIterator(data));

	CRF crf1 = new CRF(p.getDataAlphabet(), p.getTargetAlphabet());
	crf1.addFullyConnectedStatesForLabels();
	CRFTrainerByLabelLikelihood crft1 = new CRFTrainerByLabelLikelihood(
			crf1);
	crft1.trainIncremental(instances);

	CRF crf2 = new CRF(p.getDataAlphabet(), p.getTargetAlphabet());
	crf2.addFullyConnectedStatesForLabels();
	// Freeze some weights, before training
	for (int i = 0; i < crf2.getWeights().length; i += 2)
		crf2.freezeWeights(i);
	CRFTrainerByLabelLikelihood crft2 = new CRFTrainerByLabelLikelihood(
			crf2);
	crft2.trainIncremental(instances);

	SparseVector[] w = crf2.getWeights();
	double[] b = crf2.getDefaultWeights();
	for (int i = 0; i < w.length; i += 2) {
		assertEquals(0.0, b[i], 1e-10);
		for (int loc = 0; loc < w[i].numLocations(); loc++) {
			assertEquals(0.0, w[i].valueAtLocation(loc), 1e-10);
		}
	}

	// Check that the frozen weights has worse likelihood
	Optimizable.ByGradientValue optable1 = crft1
			.getOptimizableCRF(instances);
	Optimizable.ByGradientValue optable2 = crft2
			.getOptimizableCRF(instances);
	double val1 = optable1.getValue();
	double val2 = optable2.getValue();
	assertTrue(
			"Error: Freezing weights does not harm log-likelihood!  Full "
					+ val1 + ", Frozen " + val2, val1 > val2);
}
 

import cc.mallet.pipe.Pipe; //导入方法依赖的package包/类
public void disabledtestAddOrderNStates ()
{
   Pipe p = makeSpacePredictionPipe ();

   InstanceList instances = new InstanceList (p);
  instances.addThruPipe (new ArrayIterator(data));
  InstanceList[] lists = instances.split (new java.util.Random (678), new double[]{.5, .5});

	// Compare 3 CRFs trained with addOrderNStates, and make sure
	// that having more features leads to a higher likelihood

  MEMM crf1 = new MEMM(p.getDataAlphabet(), p.getTargetAlphabet());
  crf1.addOrderNStates (lists [0],
											 new int[] { 1, },
											 new boolean[] { false, },
											 "START",
											 null,
											 null,
											 false);
  crf1.setWeightsDimensionAsIn(lists[0]);
  MEMMTrainer memmt1 = new MEMMTrainer (crf1);
	memmt1.train(lists [0]);


  MEMM crf2 = new MEMM(p.getDataAlphabet(), p.getTargetAlphabet());
  crf2.addOrderNStates (lists [0],
												 new int[] { 1, 2, },
												 new boolean[] { false, true },
												 "START",
												 null,
												 null,
												 false);
  crf2.setWeightsDimensionAsIn(lists[0]);
  MEMMTrainer memmt2 = new MEMMTrainer (crf2);
	memmt2.train(lists [0]);


  MEMM crf3 = new MEMM(p.getDataAlphabet(), p.getTargetAlphabet());
  crf3.addOrderNStates (lists [0],
											 new int[] { 1, 2, },
											 new boolean[] { false, false },
											 "START",
											 null,
											 null,
											 false);
  crf3.setWeightsDimensionAsIn(lists[0]);
  MEMMTrainer memmt3 = new MEMMTrainer (crf3);
	memmt3.train(lists [0]);

	// Prevent cached values
	double lik1 = getLikelihood (memmt1, lists[0]);
	double lik2 = getLikelihood (memmt2, lists[0]);
	double lik3 = getLikelihood (memmt3, lists[0]);

	System.out.println("CRF1 likelihood "+lik1);

	assertTrue ("Final zero-order likelihood <"+lik1+"> greater than first-order <"+lik2+">",
							lik1 < lik2);
	assertTrue ("Final defaults-only likelihood <"+lik2+"> greater than full first-order <"+lik3+">",
							lik2 < lik3);

	assertEquals (-167.335971702, lik1, 0.0001);
	assertEquals (-166.212235389, lik2, 0.0001);
	assertEquals ( -90.386005741, lik3, 0.0001);
}
 

import cc.mallet.pipe.Pipe; //导入方法依赖的package包/类
public NaiveBayesTrainer (Pipe instancePipe) {
	this.instancePipe = instancePipe;
	this.dataAlphabet = instancePipe.getDataAlphabet();
	this.targetAlphabet = instancePipe.getTargetAlphabet();
}