DataStructuresSOA.java

/* file: DataStructuresSOA.java */
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/*
 //  Content:
 //     Java example of using a structure of arrays (SOA)
 */

package com.intel.daal.examples.datasource;

import java.nio.DoubleBuffer;
import java.nio.IntBuffer;
import com.intel.daal.data_management.data.*;
import com.intel.daal.examples.utils.Service;
import com.intel.daal.services.DaalContext;


class DataStructuresSOA {
    private static final long firstReadRow = 0;
    private static final long nRead        = 3;
    private static final long nVectorsSOA  = 10;
    private static final long nFeaturesSOA = 4;

    private static DaalContext context = new DaalContext();

    public static void main(String[] args) {
        System.out.println("Structure of array (SOA) numeric table example");

        long readFeatureIdx;

        int[] iDataSOA = { 1, 2, 3, 4, 5, 1, 2, 3, 4, 5 };
        double[] dDataSOA = { 1.0, 1.2, 1.4, 1.6, 1.8, 2.0, 2.2, 2.4, 2.6, 2.8 };
        float[] fDataSOA = { 3.1f, 3.2f, 3.3f, 3.4f, 3.5f, 3.6f, 3.7f, 3.8f, 3.9f, 4.0f };
        long[] lDataSOA = { -10, -20, -30, -40, -50, -60, -70, -80, -90, -100 };

        /* Construct an SOA numeric table with nVectorsSOA rows and nFeaturesSOA columns */
        SOANumericTable dataTable = new SOANumericTable(context, nFeaturesSOA, nVectorsSOA);
        dataTable.setArray(iDataSOA, 0);
        dataTable.setArray(dDataSOA, 1);
        dataTable.setArray(fDataSOA, 2);
        dataTable.setArray(lDataSOA, 3);

        /* Read a block of rows */
        DoubleBuffer dataDouble = DoubleBuffer.allocate((int) (nRead * nFeaturesSOA));

        dataDouble = dataTable.getBlockOfRows(firstReadRow, nRead, dataDouble);
        printDoubleBuffer(dataDouble, nFeaturesSOA, nRead, "Print SOA data structures as double:");
        dataTable.releaseBlockOfRows(firstReadRow, nRead, dataDouble);

        /* Read a feature (column) */
        IntBuffer dataInt = IntBuffer.allocate((int) nVectorsSOA);
        readFeatureIdx = 0;
        dataInt = dataTable.getBlockOfColumnValues(readFeatureIdx, firstReadRow, nVectorsSOA, dataInt);
        printIntBuffer(dataInt, 1, nVectorsSOA, "Print the first feature of SOA:");
        dataTable.releaseBlockOfColumnValues(readFeatureIdx, firstReadRow, nVectorsSOA, dataInt);

        /* Get the automatically generated dictionary and get the number of features */
        DataDictionary dictionary = dataTable.getDictionary();
        System.out.println("Number of features in table: " + dictionary.getNumberOfFeatures());
        System.out.println("");

        System.out.println("Default type in autogenerated dictionary:");
        for (int i = 0; i < nFeaturesSOA; i++) {
            DataFeature df = dictionary.getFeature(i);
            DataFeatureUtils.FeatureType featureType = df.getFeatureType();
            System.out.print("Type of feature #" + i + ": ");
            System.out.println(featureType.toString());
        }
        System.out.println("");

        /* Modify the dictionary information about data */
        DataFeature categoricalFeature = dictionary.getFeature(0);
        categoricalFeature.setFeatureType(DataFeatureUtils.FeatureType.DAAL_CATEGORICAL);

        System.out.println("Modified type in the dictionary:");
        for (int i = 0; i < nFeaturesSOA; i++) {
            DataFeature df = dictionary.getFeature(i);
            DataFeatureUtils.FeatureType featureType = df.getFeatureType();
            System.out.print("Type of feature #" + i + ": ");
            System.out.println(featureType.toString());
        }
        System.out.println("");

        context.dispose();
    }

    private static void printDoubleBuffer(DoubleBuffer buf, long nColumns, long nRows, String message) {
        int step = (int) nColumns;
        System.out.println(message);
        for (int i = 0; i < nRows; i++) {
            for (int j = 0; j < nColumns; j++) {
                System.out.format("%6.3f   ", buf.get(i * step + j));
            }
            System.out.println("");
        }
        System.out.println("");
    }

    private static void printIntBuffer(IntBuffer buf, long nColumns, long nRows, String message) {
        int step = (int) nColumns;
        System.out.println(message);
        for (int i = 0; i < nRows; i++) {
            for (int j = 0; j < nColumns; j++) {
                System.out.format("%3d   ", buf.get(i * step + j));
            }
            System.out.println("");
        }
        System.out.println("");
    }
}