CovarianceDenseDistributed.java

/* file: CovarianceDenseDistributed.java */
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/*
 //  Content:
 //     Java example of dense variance-covariance matrix computation in the
 //     distributed processing mode
 */

package com.intel.daal.examples.covariance;

import com.intel.daal.algorithms.covariance.*;
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 CovarianceDenseDistributed {

    /* Input data set parameters */
    private static final String datasetFileNames[] = new String[] { "../data/distributed/covcormoments_dense_1.csv",
            "../data/distributed/covcormoments_dense_2.csv", "../data/distributed/covcormoments_dense_3.csv",
            "../data/distributed/covcormoments_dense_4.csv" };

    private static final int nBlocks         = 4;

    private static PartialResult[] partialResult = new PartialResult[nBlocks];
    private static Result          result;

    private static DaalContext context = new DaalContext();

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

        for (int i = 0; i < nBlocks; i++) {
            computeOnLocalNode(i);
        }

        computeOnMasterNode();

        HomogenNumericTable covariance = (HomogenNumericTable) result.get(ResultId.covariance);
        HomogenNumericTable mean = (HomogenNumericTable) result.get(ResultId.mean);

        Service.printNumericTable("Covariance matrix:", covariance);
        Service.printNumericTable("Mean vector:", mean);

        context.dispose();
    }

    private static void computeOnLocalNode(int block) {
        /* Retrieve the input data from a .csv file */
        FileDataSource dataSource = new FileDataSource(context, datasetFileNames[block],
                DataSource.DictionaryCreationFlag.DoDictionaryFromContext,
                DataSource.NumericTableAllocationFlag.DoAllocateNumericTable);
        /* Retrieve the data from the input file */
        dataSource.loadDataBlock();

        /* Create algorithm objects to compute a variance-covariance matrix in the distributed processing mode using the default method */
        DistributedStep1Local algorithm = new DistributedStep1Local(context, Double.class, Method.defaultDense);

        /* Set input objects for the algorithm */
        NumericTable input = dataSource.getNumericTable();
        algorithm.input.set(InputId.data, input);

        /* Compute partial estimates on nodes */
        partialResult[block] = algorithm.compute();
    }

    private static void computeOnMasterNode() {
        /* Create algorithm objects to compute a variance-covariance matrix in the distributed processing mode using the default method */
        DistributedStep2Master algorithm = new DistributedStep2Master(context, Double.class, Method.defaultDense);

        /* Set input objects for the algorithm */
        for (int i = 0; i < nBlocks; i++) {
            algorithm.input.add(DistributedStep2MasterInputId.partialResults, partialResult[i]);
        }

        /* Compute a partial estimate on the master node from the partial estimates on local nodes */
        algorithm.compute();

        /* Finalize the result in the distributed processing mode */
        result = algorithm.finalizeCompute();
    }
}