/**
  * met à jour la table features de featurersList
  *
  * @throws IOException
  */
 public void setListeFeatures() throws IOException {
   for (Featurer featurer : featurers) {
     Map<KeyDQ, List<Double>> feat = featurer.getFeatures();
     for (KeyDQ keyDQ : feat.keySet()) {
       if (features.containsKey(keyDQ)) {
         features.get(keyDQ).addAll(featurer.getFeatures().get(keyDQ));
       } else {
         features.put(keyDQ, featurer.getFeatures().get(keyDQ));
       }
     }
   }
 }