QROnline.java

/* file: QROnline.java */
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/*
 //  Content:
 //     Java example of computing QR decomposition in the online processing mode
 */

package com.intel.daal.examples.qr;

import com.intel.daal.algorithms.qr.InputId;
import com.intel.daal.algorithms.qr.Method;
import com.intel.daal.algorithms.qr.Online;
import com.intel.daal.algorithms.qr.Result;
import com.intel.daal.algorithms.qr.ResultId;
import com.intel.daal.data_management.data.HomogenNumericTable;
import com.intel.daal.data_management.data.NumericTable;
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 QROnline {
    /* Input data set parameters */
    private static final String dataset         = "../data/online/qr.csv";
    private static final int    nVectorsInBlock = 4000;
    private static Result       res;

    private static DaalContext context = new DaalContext();

    public static void main(String[] args) throws java.io.FileNotFoundException, java.io.IOException {
        /* Initialize FileDataSource to retrieve the input data from a .csv file */
        FileDataSource dataSource = new FileDataSource(context, dataset,
                DataSource.DictionaryCreationFlag.DoDictionaryFromContext,
                DataSource.NumericTableAllocationFlag.DoAllocateNumericTable);

        /* Create an algorithm to compute QR decomposition in the online processing mode */
        Online qrAlgorithm = new Online(context, Double.class, Method.defaultDense);

        NumericTable input = dataSource.getNumericTable();
        qrAlgorithm.input.set(InputId.data, input);

        while (dataSource.loadDataBlock(nVectorsInBlock) == nVectorsInBlock) {
            /* Compute QR decomposition */
            qrAlgorithm.compute();
        }

        /* Finalize computations and retrieve the results */
        res = qrAlgorithm.finalizeCompute();

        /* Print the results */
        printResults();

        context.dispose();
    }

    private static void printResults() {
        HomogenNumericTable Q = (HomogenNumericTable) res.get(ResultId.matrixQ);
        HomogenNumericTable R = (HomogenNumericTable) res.get(ResultId.matrixR);

        Service.printNumericTable("Orthogonal matrix Q (10 first vectors):", Q, 10);
        Service.printNumericTable("Triangular matrix R:", R);
    }
}