public static Instances removeUseless(Instances inInstances) throws Exception {
   // filter out useless
   RemoveUseless removeUselessFilter = new RemoveUseless();
   removeUselessFilter.setMaximumVariancePercentageAllowed(99.0);
   removeUselessFilter.setInputFormat(inInstances);
   return Filter.useFilter(inInstances, removeUselessFilter);
 }