svd_online.cpp

/* file: svd_online.cpp */
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/*
!  Content:
!    C++ example of singular value decomposition (SVD) in the online processing
!    mode
!******************************************************************************/

#include "daal.h"
#include "service.h"

using namespace std;
using namespace daal;
using namespace daal::algorithms;

/* Input data set parameters */
const string datasetFileName = "../data/online/svd.csv";
const size_t nRowsInBlock      = 4000;

int main(int argc, char *argv[])
{
    checkArguments(argc, argv, 1, &datasetFileName);

    /* Initialize FileDataSource<CSVFeatureManager> to retrieve the input data from a .csv file */
    FileDataSource<CSVFeatureManager> dataSource(datasetFileName, DataSource::doAllocateNumericTable,
                                                 DataSource::doDictionaryFromContext);

    /* Create an algorithm to compute SVD in the online processing mode */
    svd::Online<> algorithm;

    while(dataSource.loadDataBlock(nRowsInBlock) == nRowsInBlock)
    {
        algorithm.input.set( svd::data, dataSource.getNumericTable() );

        /* Compute SVD */
        algorithm.compute();
    }

    /* Finalize computations and retrieve the results */
    algorithm.finalizeCompute();

    services::SharedPtr<svd::Result> res = algorithm.getResult();

    /* Print the results */
    printNumericTable(res->get(svd::singularValues),      "Singular values:");
    printNumericTable(res->get(svd::rightSingularMatrix), "Right orthogonal matrix V:");
    printNumericTable(res->get(svd::leftSingularMatrix),  "Left orthogonal matrix U:", 10);

    return 0;
}