Java Linear类代码示例

import de.bwaldvogel.liblinear.Linear; //导入依赖的package包/类
/** Learns a new SVM model with the LibSVM package. */
@Override
public Model learn(ExampleSet exampleSet) throws OperatorException {

	Parameter params = getParameters(exampleSet);

	if (exampleSet.size() < 2) {
		throw new UserError(this, 110, 2);
	}

	Linear.resetRandom();
	Linear.disableDebugOutput();
	Problem problem = getProblem(exampleSet);
	de.bwaldvogel.liblinear.Model model = Linear.train(problem, params);

	return new FastMarginModel(exampleSet, model, getParameterAsBoolean(PARAMETER_USE_BIAS));
}
 

import de.bwaldvogel.liblinear.Linear; //导入依赖的package包/类
/**
 * @param gatherer 
 * @param features 
 * @return an array of feature IDs (>=1), ordered by feature importance, without zero-importance features.
 */
private static <T extends Serializable, G extends Serializable> int[] getFeatureImportance(ExampleGatherer<T, G> gatherer,
        int[] features) {
	ZScoreFeatureNormalizer scaleFn = ZScoreFeatureNormalizer.fromGatherer(gatherer);
	Parameter param = new Parameter(SolverType.L2R_L2LOSS_SVR, 0.01, 0.001);
	Problem problem = gatherer.generateLibLinearProblem(features, scaleFn);
	Model m = Linear.train(problem, param);
	double[] weights = m.getFeatureWeights();

	int[] ftrImportance = Arrays.stream(features).boxed().sorted(new Comparator<Integer>() {
		@Override
		public int compare(Integer fId0, Integer fId1) {
			return Double.compare(Math.abs(weights[ArrayUtils.indexOf(features, fId0)]), Math.abs(ArrayUtils.indexOf(features, fId1)));
		}
	}).filter(fId -> weights[ArrayUtils.indexOf(features, fId)] != 0.0).mapToInt(fId -> fId.intValue()).toArray();

	return ftrImportance;
}
 

import de.bwaldvogel.liblinear.Linear; //导入依赖的package包/类
public void serialize(OutputStream out) throws IOException {
  
  DataOutputStream ds = new DataOutputStream(out);
  
  ByteArrayOutputStream modelBytes = new ByteArrayOutputStream();
  Linear.saveModel(new OutputStreamWriter(modelBytes, LIBLINEAR_MODEL_ENCODING), model);

  ds.writeInt(modelBytes.size());
  ds.write(modelBytes.toByteArray());
  
  // write string array
  // write label count
  ds.writeInt(outcomeLabels.length);
  
  // write each label
  for (String outcomeLabel : outcomeLabels) {
    ds.writeUTF(outcomeLabel);
  }

  // write entry count
  ds.writeInt(predMap.size());
  for (Map.Entry<String, Integer> entry : predMap.entrySet()) {
    ds.writeUTF(entry.getKey());
    ds.writeInt(entry.getValue());
  }
}
 

import de.bwaldvogel.liblinear.Linear; //导入依赖的package包/类
/**
 * Train SVM model. Return alpha and w matrix.
 * 
 * */
public StoreAlphaWeight trainSvm(File saveModel) throws Exception{
	StoreAlphaWeight saww=new StoreAlphaWeight();
	this.modelFile=saveModel;
	Problem problem=new Problem();
	problem.l=train; 
	problem.n=dimensions;
	problem.x=vectrain;
	problem.y=trainattr;
	SolverType s=SolverType.MCSVM_CS;  
       Parameter parameter = new Parameter(s, C, eps);
       Model modelg = Linear.train(problem, parameter, saww);
       try {
		modelg.save(saveModel);
	} catch (IOException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}
       return saww;
}
 

import de.bwaldvogel.liblinear.Linear; //导入依赖的package包/类
public double[] evaluateSvm() throws Exception{
       	int right=0;
		Model model = Model.load(modelFile);
        for(int t=0;t<test;t++){
            double prediction = Linear.predict(model, vectest[t]);
            if(prediction==testattr[t]){
            	right++;
            }
          }
        double precision=(double)right/test;
        System.err.println("*************Precision = "+precision*100+"%*************");
        double storeResult[]=new double[3];
        storeResult[0]=right;
        storeResult[1]=test;
        storeResult[2]=precision;
        return storeResult;
}
 

import de.bwaldvogel.liblinear.Linear; //导入依赖的package包/类
public void train(List<Pair<CounterInterface<Integer>,Integer>> trainSet) {
	Problem problem = new Problem();
	FeatureNode[][] x = new FeatureNode[trainSet.size()][];
	double[] y = new double[trainSet.size()];
	int maxFeature = 0;
	for (int i=0; i<x.length; ++i) {
		CounterInterface<Integer> features = trainSet.get(i).getFirst();
		for (Map.Entry<Integer, Double> feat : features.entries()) {
			maxFeature = Math.max(feat.getKey()+1, maxFeature);
		}
		x[i] = convertToFeatureNodes(features);
		y[i] = trainSet.get(i).getSecond();
	}
	
	problem.l = trainSet.size();
	problem.n = maxFeature;
	problem.x = x;
	problem.y = y;
	problem.bias = 0.0;
	
	Parameter parameter = new Parameter(solverType, C, eps);
	model = Linear.train(problem, parameter);
}
 

import de.bwaldvogel.liblinear.Linear; //导入依赖的package包/类
public Matrix predictOne(Feature[] x) {
	Matrix result = null;
	if (model.isProbabilityModel()) {
		double[] probabilities = new double[model.getNrClass()];
		Linear.predictProbability(model, x, probabilities);
		result = Matrix.Factory.zeros(1, model.getNrClass());
		for (int i = 0; i < probabilities.length; i++) {
			int label = model.getLabels()[i];
			result.setAsDouble(probabilities[i], 0, label);
		}
	} else {
		double classId = Linear.predict(model, x);
		result = Matrix.Factory.zeros(1, Math.max(model.getNrClass(), (int) (classId + 1)));
		result.setAsDouble(1.0, 0, (int) classId);
	}

	return result;
}
 

import de.bwaldvogel.liblinear.Linear; //导入依赖的package包/类
@Override
public Map<OUTCOME_TYPE, Double> score(List<Feature> features) throws CleartkProcessingException {
  FeatureNode[] encodedFeatures = this.featuresEncoder.encodeAll(features);
  
  // get score for each outcome
  int[] encodedOutcomes = this.model.getLabels();
  double[] scores = new double[encodedOutcomes.length];
  if (this.model.isProbabilityModel()) {
    Linear.predictProbability(this.model, encodedFeatures, scores);
  } else {
    Linear.predictValues(this.model, encodedFeatures, scores);
  }
  
  // handle 2-class model, which is special-cased by LIBLINEAR to only return one score
  if (this.model.getNrClass() == 2 && scores[1] == 0.0) {
    scores[1] = -scores[0];
  }
  
  // create scored outcome objects
  Map<OUTCOME_TYPE, Double> scoredOutcomes = Maps.newHashMap();
  for (int i = 0; i < encodedOutcomes.length; ++i) {
    OUTCOME_TYPE outcome = this.outcomeEncoder.decode(encodedOutcomes[i]);
    scoredOutcomes.put(outcome, scores[i]);
  }
  return scoredOutcomes;
}
 

import de.bwaldvogel.liblinear.Linear; //导入依赖的package包/类
private static Prediction[] testLinearModel(LibLINEARModel model, Feature[][] problem) {
	Prediction[] pred = new Prediction[problem.length];		
	for (int i = 0; i < problem.length; i++) {
		double[] decVal = new double[(model.getModel().getNrClass() <= 2) ? 1 : model.getModel().getNrClass()];
		if (!model.hasProbabilities()) {
			pred[i] = new Prediction(Linear.predictValues(model.getModel(), problem[i], decVal), i);
			pred[i].setProbabilities(false);
		} else {
			pred[i] = new Prediction(Linear.predictProbability(model.getModel(), problem[i], decVal), i);
			pred[i].setProbabilities(true);
		}
		pred[i].setDecisionValue(decVal);
		pred[i].setClassLabels(model.getModel().getLabels());
		pred[i].setPairWise(false); // LibLINEAR does not do pairwise multiclass prediction, but 1 vs all
		pred[i].setUsedKernel(model.getKernelSetting());
	}
	return pred;
}
 

import de.bwaldvogel.liblinear.Linear; //导入依赖的package包/类
public static void train() throws IOException, InvalidInputDataException{
	String file = "output\\svm/book_svm.svm";
	Problem problem = Problem.readFromFile(new File(file),-1);

	SolverType solver = SolverType.L2R_LR; // -s 0
	double C = 1.0;    // cost of constraints violation
	double eps = 0.01; // stopping criteria

	Parameter parameter = new Parameter(solver, C, eps);
	Model model = Linear.train(problem, parameter);
	File modelFile = new File("output/model");
	model.save(modelFile);
	System.out.println(modelFile.getAbsolutePath());
	// load model or use it directly
	model = Model.load(modelFile);

	Feature[] instance = { new FeatureNode(1, 4), new FeatureNode(2, 2) };
	double prediction = Linear.predict(model, instance);
	System.out.println(prediction);
	int nr_fold = 10;
    double[] target = new double[problem.l];
	Linear.crossValidation(problem, parameter, nr_fold, target);
}
 

import de.bwaldvogel.liblinear.Linear; //导入依赖的package包/类
@Deprecated
public static int[] predict2(Model model, Feature[][] data, int[] labels) {

	int N = data.length;
	int[] pre_label = new int[N];

	for ( int i = 0; i < N; i ++ ) {
		pre_label[i] = Linear.predict(model, data[i]);
	}

	if (labels != null) {
		int cnt_correct = 0;
		for ( int i = 0; i < N; i ++ ) {
			if ( pre_label[i] == labels[i] )
				cnt_correct ++;
		}
		double accuracy = (double)cnt_correct / (double)N;
		System.out.println(String.format("Accuracy: %.2f%%\n", accuracy * 100));
	}

	return pre_label;

}
 

import de.bwaldvogel.liblinear.Linear; //导入依赖的package包/类
@Override
public Analysis analyze(Analyzable a) throws AnalyzerFailureException {
    if (a == null) return null;

    if (!(a instanceof IdentifiableTextContent)) {
        throw new AnalyzerFailureException("Analyzable not identifiable. This analyzer requires an IdentifiableTextContent.");
    }

    IdentifiableTextContent tc = (IdentifiableTextContent) a;

    try {
        Feature[] vector = LibLinearUtils.toLibLinear(representer.represent(tc.getText()).toSvmNodes());
        double[] probs = new double[labels.size()];
        Linear.predictProbability(model, vector, probs);
        ClassificationAnalysis analysis = new ClassificationAnalysis(tc.getId());
        for (int i = 0; i < labelIndeces.length; ++i) {
            analysis.addClassification(labels.get(labelIndeces[i]), probs[i] >= threshold ? probs[i] : 0d);
        }
        return analysis;
    } catch (Exception e) {
        throw new AnalyzerFailureException("Classifier failed on record " + tc.getId(), e);
    }
}
 

import de.bwaldvogel.liblinear.Linear; //导入依赖的package包/类
@Override
public String getLabel(JCas cas) {
    Vector<Feature[]> instanceFeatures = applyFeatures(cas, features);
    Feature[] instance = combineInstanceFeatures(instanceFeatures);
    probEstimates = new double[model.getNrClass()];
    Double prediction;
    if (model.getSolverType().isLogisticRegressionSolver()) {
        prediction = Linear.predictProbability(model, instance, probEstimates);
        score = probEstimates[prediction.intValue()];
    } else {
        prediction = Linear.predict(model, instance);
    }
    label = labelMappings.get(prediction);
    return label;
}
 

import de.bwaldvogel.liblinear.Linear; //导入依赖的package包/类
@Override
public String getLabel(JCas cas) {
    Vector<Feature[]> instanceFeatures = applyFeatures(cas, features);

    Feature[] instance = combineInstanceFeatures(instanceFeatures);
    probEstimates = new double[model.getNrClass()];
    Double prediction = Linear.predictProbability(model, instance, probEstimates);

    label = labelMappings.get(prediction);
    score = probEstimates[prediction.intValue()];
    return label;
}
 

import de.bwaldvogel.liblinear.Linear; //导入依赖的package包/类
public LiblinearModel(InputStream in) throws IOException {
  
  DataInputStream di = new DataInputStream(in);
  
  int modelByteLength = di.readInt();
  
  // TODO: We should have a fixed memory limit here ...
  
  byte modelBytes[] = new byte[modelByteLength];
  di.read(modelBytes);
  
  int outcomeLabelLength = di.readInt();
  
  outcomeLabels = new String[outcomeLabelLength];
  for (int i = 0; i < outcomeLabelLength; i++) {
    outcomeLabels[i] = di.readUTF();
  }
  
  predMap = new HashMap<String, Integer>();
  
  int predMapSize = di.readInt();
  for (int i = 0; i < predMapSize; i++) {
    String key = di.readUTF();
    int value = di.readInt();
    predMap.put(key, value);
  }
  
  model = Linear.loadModel(new InputStreamReader(new ByteArrayInputStream(modelBytes), LIBLINEAR_MODEL_ENCODING));
}