LogitBoostBatch.java

/* file: LogitBoostBatch.java */
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/*
 //  Content:
 //     Java example of LogitBoost classification.
 //
 //     The program trains the LogitBoost model on a supplied training data set
 //     and then performs classification of previously unseen data.
 */

package com.intel.daal.examples.boosting.logitboost;

import com.intel.daal.algorithms.classifier.prediction.ModelInputId;
import com.intel.daal.algorithms.classifier.prediction.NumericTableInputId;
import com.intel.daal.algorithms.classifier.prediction.PredictionResult;
import com.intel.daal.algorithms.classifier.prediction.PredictionResultId;
import com.intel.daal.algorithms.classifier.training.InputId;
import com.intel.daal.algorithms.classifier.training.TrainingResultId;
import com.intel.daal.algorithms.logitboost.Model;
import com.intel.daal.algorithms.logitboost.prediction.*;
import com.intel.daal.algorithms.logitboost.training.*;
import com.intel.daal.data_management.data.NumericTable;
import com.intel.daal.data_management.data.HomogenNumericTable;
import com.intel.daal.data_management.data.MergedNumericTable;
import com.intel.daal.data_management.data_source.DataSource;
import com.intel.daal.data_management.data_source.FileDataSource;
import com.intel.daal.examples.utils.Service;
import com.intel.daal.services.DaalContext;

class LogitBoostBatch {
    /* Input data set parameters */
    private static final String trainDataset = "../data/batch/logitboost_train.csv";

    private static final String testDataset  = "../data/batch/logitboost_test.csv";

    private static final int nFeatures     = 20;
    private static final int nClasses      = 5;

    /* LogitBoost algorithm parameters */
    private static final int    maxIterations     = 100;  /* Maximum number of terms in additive regression */
    private static final double accuracyThreshold = 0.01; /* Training accuracy */

    private static TrainingResult   trainingResult;
    private static PredictionResult predictionResult;
    private static NumericTable     testGroundTruth;

    private static DaalContext context = new DaalContext();

    public static void main(String[] args) throws java.io.FileNotFoundException, java.io.IOException {

        trainModel();

        testModel();

        printResults();

        context.dispose();
    }

    private static void trainModel() {
        /* Retrieve the data from the input data sets */
        FileDataSource trainDataSource = new FileDataSource(context, trainDataset,
                DataSource.DictionaryCreationFlag.DoDictionaryFromContext,
                DataSource.NumericTableAllocationFlag.NotAllocateNumericTable);

        /* Create Numeric Tables for training data and labels */
        NumericTable trainData = new HomogenNumericTable(context, Double.class, nFeatures, 0, NumericTable.AllocationFlag.NotAllocate);
        NumericTable trainGroundTruth = new HomogenNumericTable(context, Double.class, 1, 0, NumericTable.AllocationFlag.NotAllocate);
        MergedNumericTable mergedData = new MergedNumericTable(context);
        mergedData.addNumericTable(trainData);
        mergedData.addNumericTable(trainGroundTruth);

        /* Retrieve the data from an input file */
        trainDataSource.loadDataBlock(mergedData);

        /* Create algorithm objects to train the LogitBoost model */
        TrainingBatch algorithm = new TrainingBatch(context, Double.class, TrainingMethod.friedman, nClasses);
        algorithm.parameter.setMaxIterations(maxIterations);
        algorithm.parameter.setAccuracyThreshold(accuracyThreshold);

        /* Pass a training data set and dependent values to the algorithm */
        algorithm.input.set(InputId.data, trainData);
        algorithm.input.set(InputId.labels, trainGroundTruth);

        /* Train the LogitBoost model */
        trainingResult = algorithm.compute();
    }

    private static void testModel() {
        FileDataSource testDataSource = new FileDataSource(context, testDataset,
                DataSource.DictionaryCreationFlag.DoDictionaryFromContext,
                DataSource.NumericTableAllocationFlag.NotAllocateNumericTable);

        /* Create Numeric Tables for testing data and labels */
        NumericTable testData = new HomogenNumericTable(context, Double.class, nFeatures, 0, NumericTable.AllocationFlag.NotAllocate);
        testGroundTruth = new HomogenNumericTable(context, Double.class, 1, 0, NumericTable.AllocationFlag.NotAllocate);
        MergedNumericTable mergedData = new MergedNumericTable(context);
        mergedData.addNumericTable(testData);
        mergedData.addNumericTable(testGroundTruth);

        /* Retrieve the data from an input file */
        testDataSource.loadDataBlock(mergedData);

        /* Create algorithm objects for LogitBoost prediction with the fast method */
        PredictionBatch algorithm = new PredictionBatch(context, Double.class, PredictionMethod.defaultDense, nClasses);

        /* Pass a testing data set and the trained model to the algorithm */
        Model model = trainingResult.get(TrainingResultId.model);
        algorithm.input.set(NumericTableInputId.data, testData);
        algorithm.input.set(ModelInputId.model, model);

        /* Compute prediction results */
        predictionResult = algorithm.compute();
    }

    private static void printResults() {
        NumericTable predictionResults = predictionResult.get(PredictionResultId.prediction);
        Service.printClassificationResult(testGroundTruth, predictionResults, "Ground truth", "Classification results",
                "LogitBoost classification results (first 20 observations):", 20);
    }

}