public String augmentFeatureInputString(String s) {
   String fs = s;
   Iterator itr = mUseFeatures.iterator();
   while (itr.hasNext()) {
     String f = (String) itr.next();
     fs = fs + "+" + mAggregatorManager.getDataMap(f).get(f);
   }
   return fs;
 }
 public FeatureAssembly() {
   mAggregatorManager = AggregatorManager.getInstance();
   mPossibleFeatures = Arrays.asList(mAggregatorManager.getListOfFeatures());
   mUseFeatures = new HashSet<String>();
 }