Refactor samples and fix Metrics tests

samples/ArffFiles.h

@@ -0,0 +1,28 @@
+#ifndef ARFFFILES_H
+#define ARFFFILES_H
+#include <string>
+#include <vector>
+#include <tuple>
+using namespace std;
+class ArffFiles {
+private:
+    vector<string> lines;
+    vector<tuple<string, string>> attributes;
+    string className, classType;
+    vector<vector<float>> X;
+    vector<int> y;
+    void generateDataset(bool);
+public:
+    ArffFiles();
+    void load(string, bool = true);
+    vector<string> getLines();
+    unsigned long int getSize();
+    string getClassName();
+    string getClassType();
+    string trim(const string&);
+    vector<vector<float>>& getX();
+    vector<int>& getY();
+    vector<tuple<string, string>> getAttributes();
+    vector<int> factorize(const vector<string>& labels_t);
+};
+#endif