/* file: PCASVDDenseDistr.java */
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 //  Content:
 //     Java example of principal component analysis (PCA) using the singular
 //     value decomposition (SVD) method in the distributed processing mode

package com.intel.daal.examples.pca;

import com.intel.daal.algorithms.PartialResult;
import com.intel.daal.algorithms.pca.DistributedStep1Local;
import com.intel.daal.algorithms.pca.DistributedStep2Master;
import com.intel.daal.algorithms.pca.InputId;
import com.intel.daal.algorithms.pca.MasterInputId;
import com.intel.daal.algorithms.pca.Method;
import com.intel.daal.algorithms.pca.Result;
import com.intel.daal.algorithms.pca.ResultId;
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 PCASVDDenseDistr {
    /* Input data set parameters */
    private static final String[] dataset = { "../data/distributed/pca_normalized_1.csv",
                                              "../data/distributed/pca_normalized_2.csv", "../data/distributed/pca_normalized_3.csv",
    private static final int nNodes = 4;

    private static PartialResult[] pres = new PartialResult[nNodes];

    private static DaalContext context = new DaalContext();

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

        for (int i = 0; i < nNodes; i++) {
            /* Initialize FileDataSource to retrieve the input data from a .csv file */
            FileDataSource dataSource = new FileDataSource(context, dataset[i],

            /* Retrieve the data from the input file */

            /* Create an algorithm to compute PCA decomposition using the SVD method on local nodes*/
            DistributedStep1Local pcaLocal = new DistributedStep1Local(context, Float.class, Method.svdDense);

            /* Set the input data on local nodes */
            NumericTable data = dataSource.getNumericTable();
            pcaLocal.input.set(InputId.data, data);

            /* Compute PCA on local nodes */
            pres[i] = pcaLocal.compute();

        /* Create an algorithm to compute PCA decomposition using the SVD method on the master node */
        DistributedStep2Master pcaMaster = new DistributedStep2Master(context, Float.class, Method.svdDense);

        /* Add partial results computed on local nodes to the algorithm on the master node */
        for (int i = 0; i < nNodes; i++) {
            pcaMaster.input.add(MasterInputId.partialResults, pres[i]);

        /* Compute PCA decomposition on the master node */

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

        NumericTable eigenValues = res.get(ResultId.eigenValues);
        NumericTable eigenVectors = res.get(ResultId.eigenVectors);
        Service.printNumericTable("Eigenvalues:", eigenValues);
        Service.printNumericTable("Eigenvectors:", eigenVectors);

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