Usage of StreamingFile and StreamingFeatures

streaming_example.cpp

#include <shogun/features/StreamingFeatures.h>
#include <shogun/lib/StreamingFile.h>
#include <shogun/lib/common.h>
#include <shogun/base/init.h>

#include <stdlib.h>
#include <stdio.h>

using namespace shogun;

int main()
{

        init_shogun();

        FILE* infile=fopen("sample.dat", "r");
        CStreamingFile* f = new CStreamingFile(infile);

        CStreamingFeatures* features = new CStreamingFeatures(f, false);
        
        SG_REF(features);
        
        float64_t* fv;
        int32_t length, vector_number = 0;
        float64_t label;

        features->start_parser();

        while (features->get_next_feature_vector(fv, length, label))
        {
                vector_number++;
                
                printf("Vector %d\n--------------", vector_number);
                for (int i=0; i<length; i++)
                {
                        printf("Fv[%d] = %f\t", i, fv[i]);
                }
                printf("\n");
                features->free_feature_vector();
        }
        
                
        printf("Done. Vectors parsed=%d.\n", vector_number);
        SG_UNREF(features);
        
        exit_shogun();
        return 0;
}

/* sample.dat is something like this:
1 -1.991488249375454 -4.10515592045831
1 -4.638179746904141 -0.7680036306633036
*/