data_set_examples.cpp

A few examples regarding the plssvm::data_set class.

 
#include "plssvm/core.hpp"
 
#include <string>
#include <vector>
 
int main() {
 
    // create a data set from a file with int labels
    plssvm::data_set<double> data1{ "path/to/train/file.libsvm" };
    // create a data set from a file with std::string labels
    plssvm::data_set<double, std::string> data2{ "path/to/train/file_string_labels.libsvm" };
 
    // create a data set from a std::vector with labels
    std::vector<std::vector<double>> data_vector{ { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 } };
    std::vector<int> label_vector{ 0, 0, 1 };
    plssvm::data_set data3{ std::move(data_vector), std::move(label_vector) };
    // get the different labels
    const bool has_label = data3.has_labels();                 // will return true, since labels have explicitly been provided
    auto different_labels = data3.different_labels().value();  // will return an optional vector containing { 0, 1 }
 
    // create a train data set and scale it to the range [-1, 1]
    plssvm::data_set<double> train_data{ "path/to/train/file.libsvm", { -1.0, 1.0 } };
    // scale a test data set and scale it according to the train data set
    plssvm::data_set<double> test_data{ "path/to/test/file.libsvm", train_data.scaling_factors()->get() };
 
    return 0;
}