Java* API Reference for Intel® Data Analytics Acceleration Library 2019 Update 5

DataStructuresPackedTriangular.java

/* file: DataStructuresPackedTriangular.java */
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/*
// Content:
// Java example of using packed data structures
*/
package com.intel.daal.examples.datasource;
import java.nio.DoubleBuffer;
import com.intel.daal.data_management.data.PackedTriangularMatrix;
import com.intel.daal.data_management.data.NumericTable;
import com.intel.daal.examples.utils.Service;
import com.intel.daal.services.DaalContext;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
class DataStructuresPackedTriangular {
private static final int nDim = 5;
private static final int nRead = 5;
private static final int firstReadRow = 0;
private static DaalContext context = new DaalContext();
public static void main(String[] args) throws FileNotFoundException, IOException, ClassNotFoundException {
System.out.println("Packed triangular matrix example\n");
int readFeatureIdx;
float[] data = { 0.0f, 0.1f, 0.2f, 0.3f, 0.4f, 0.5f, 0.6f, 0.7f, 0.8f, 0.9f, 1.0f, 1.1f, 1.2f, 1.3f, 1.4f };
PackedTriangularMatrix dataTable = new PackedTriangularMatrix(context, data, nDim, NumericTable.StorageLayout.lowerPackedTriangularMatrix);
/* Read a block of rows */
DoubleBuffer dataDouble = DoubleBuffer.allocate(nRead * nDim);
dataDouble = dataTable.getBlockOfRows(firstReadRow, nRead, dataDouble);
System.out.printf("%d rows are read\n",nRead);
printDoubleBuffer(dataDouble, nDim, nRead, "Print 3 rows from packed triangular matrix as float:");
dataTable.releaseBlockOfRows(firstReadRow, nRead, dataDouble);
/* Read a feature (column) */
DoubleBuffer dataDoubleFeatures = DoubleBuffer.allocate((int) nRead);
readFeatureIdx = 2;
dataDoubleFeatures = dataTable.getBlockOfColumnValues(readFeatureIdx, firstReadRow, nRead, dataDoubleFeatures);
printDoubleBuffer(dataDoubleFeatures, 1, nRead, "Print the third feature of packed triangular matrix:");
/* Set new value to a buffer and release it */
dataDoubleFeatures.put(readFeatureIdx-1, -1);
dataDoubleFeatures.put(readFeatureIdx+1, -2);
dataTable.releaseBlockOfColumnValues(readFeatureIdx, firstReadRow, nRead, dataDoubleFeatures);
/* Read a block of rows */
dataDouble = dataTable.getBlockOfRows(firstReadRow, nRead, dataDouble);
System.out.printf("%d rows are read\n",nRead);
printDoubleBuffer(dataDouble, nDim, nRead, "Print 3 rows from packed triangular matrix as float:");
dataTable.releaseBlockOfRows(firstReadRow, nRead, dataDouble);
context.dispose();
}
private static void printDoubleBuffer(DoubleBuffer buf, long nColumns, long nRows, String message) {
int step = (int) nColumns;
System.out.println(message);
for (int i = 0; i < nRows; i++) {
for (int j = 0; j < nColumns; j++) {
System.out.format("%6.3f ", buf.get(i * step + j));
}
System.out.println("");
}
System.out.println("");
}
}

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