/* file: PCACorCSROnline.java */
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 //  Content:
 //     Java example of principal component analysis (PCA) using the correlation
 //     method in the online processing mode for sparse data

package com.intel.daal.examples.pca;

import com.intel.daal.algorithms.pca.InputId;
import com.intel.daal.algorithms.pca.Method;
import com.intel.daal.algorithms.pca.Online;
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.CSRNumericTable;
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 PCACorCSROnline {
    /* Input data set parameters */
    private static DaalContext  context = new DaalContext();

    /* Input data set parameters */
    private static final String datasetFileNames[] = new String[] { "../data/online/covcormoments_csr_1.csv",
    private static final int nBlocks = 4;

    public static void main(String[] args) throws java.io.FileNotFoundException, java.io.IOException {
        /* Create an algorithm to compute PCA decomposition using the correlation method */
        Online pcaAlgorithm = new Online(context, Float.class, Method.correlationDense);

        com.intel.daal.algorithms.covariance.Online covarianceSparse
            = new com.intel.daal.algorithms.covariance.Online(context, Float.class, com.intel.daal.algorithms.covariance.Method.fastCSR);

        for (int i = 0; i < nBlocks; i++) {
            /* Read the input data from a file */
            CSRNumericTable data = Service.createSparseTable(context, datasetFileNames[i]);

            /* Set the input data */
            pcaAlgorithm.input.set(InputId.data, data);

            /* Compute partial estimates */

        /* Finalize computations and retrieve the results */
        Result res = pcaAlgorithm.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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