Correction in prepareFolds method. Issue was an error in the number of...

Correction in prepareFolds method. Issue was an error in the number of true_aler elements in each folds

src/main/java/be/cylab/java/wowa/training/Trainer.java

@@ -188,11 +188,11 @@ public class Trainer {
         List<Double> expected = dataset.getExpected();
         List<TrainingDataset> fold_dataset = new ArrayList<>();
         //Check if it is rounded !!!!
-        int element_number_in_fold = expected.size() / fold_number;
         int alert_number
                 = (int) Math.floor(Utils.sumListElements(expected)
                 / fold_number);
-        int no_alert_number = element_number_in_fold - alert_number;
+        int no_alert_number = (int) (expected.size()
+                - Utils.sumListElements(expected)) / fold_number;
 
         for (int i = 0; i < fold_number; i++) {
             TrainingDataset tmp = new TrainingDataset();