em_gmm_batch.cpp

/* file: em_gmm_batch.cpp */
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/*
!  Content:
!    C++ example of the expectation-maximization (EM) algorithm for the
!    Gaussian mixture model (GMM)
!******************************************************************************/

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

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

typedef float  dataFPType;          /* Data floating-point type */

/* Input data set parameters */
const std::string datasetFileName = "../data/batch/em_gmm.csv" ;
const size_t nComponents   = 2;
size_t nFeatures;

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);
    nFeatures = dataSource.getNumberOfColumns();

    /* Retrieve the data from the input file */
    dataSource.loadDataBlock();

    /* Create algorithm objects to initialize the EM algorithm for the GMM
     * computing the number of components using the default method */
    em_gmm::init::Batch<> initAlgorihm(nComponents);

   /* Set an input data table for the initialization algorithm */
    initAlgorihm.input.set(em_gmm::init::data, dataSource.getNumericTable());

    /* Compute initial values for the EM algorithm for the GMM with the default parameters */
    initAlgorihm.compute();

    services::SharedPtr<em_gmm::init::Result> resultInit = initAlgorihm.getResult();

    /* Create algorithm objects for the EM algorithm for the GMM computing the number of components using the default method */
    em_gmm::Batch<> algorithm(nComponents);

    /* Set an input data table for the algorithm */
    algorithm.input.set(em_gmm::data, dataSource.getNumericTable());
    algorithm.input.set(em_gmm::inputValues, initAlgorihm.getResult());

    /* Compute the results of the EM algorithm for the GMM with the default parameters */
    algorithm.compute();

    services::SharedPtr<em_gmm::Result> result = algorithm.getResult();

    /* Print the results */
    printNumericTable(result->get(em_gmm::weights), "Weights");
    printNumericTable(result->get(em_gmm::means), "Means");
    for(size_t i = 0; i < nComponents; i++)
    {
        printNumericTable(result->get(em_gmm::covariances, i), "Covariance");
    }

    return 0;
}