C++ API Reference for Intel® Data Analytics Acceleration Library 2018 Update 2

datasource_featureextraction.cpp

/* file: datasource_featureextraction.cpp */
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/*
! Content:
! C++ example for using of data source feature extraction
!******************************************************************************/
#include "daal.h"
#include "service.h"
using namespace std;
using namespace daal;
using namespace daal::algorithms;
/* Input data set parameters */
string datasetFileName = "../data/batch/kmeans_dense.csv";
int main(int argc, char *argv[])
{
checkArguments(argc, argv, 1, &datasetFileName);
/* Initialize FileDataSource to retrieve the input data from a .csv file */
FileDataSource<CSVFeatureManager> dataSource(datasetFileName, DataSource::doAllocateNumericTable);
/* Create data source dictionary from loading of the first .csv file */
dataSource.createDictionaryFromContext();
/* Filter in 3 chosen columns from a .csv file */
services::Collection<size_t> validList(3);
validList[0] = 1;
validList[1] = 2;
validList[2] = 5;
dataSource.getFeatureManager().addModifier( ColumnFilter().list(validList) );
/* Consider column with index 1 as categorical and convert it into 3 binary categorical features */
dataSource.getFeatureManager().addModifier( OneHotEncoder(1, 3) );
/* Load data from .csv file */
dataSource.loadDataBlock();
/* Print result */
NumericTablePtr table = dataSource.getNumericTable();
printNumericTable(table, "Loaded data", 4, 20);
return 0;
}

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