/** @return a <code>String</code> representation of this boosting model. */
 @Override
 public String toString() {
   StringBuffer result =
       new StringBuffer(
           super.toString()
               + Tools.getLineSeparator()
               + "Number of inner models: "
               + this.getNumberOfModels()
               + Tools.getLineSeparators(2));
   for (int i = 0; i < this.getNumberOfModels(); i++) {
     Model model = this.getModel(i);
     result.append(
         (i > 0 ? Tools.getLineSeparator() : "")
             + "Embedded model #"
             + i
             + " (weight: "
             + Tools.formatNumber(this.getWeightForModel(i))
             + "): "
             + Tools.getLineSeparator()
             + model.toResultString());
   }
   return result.toString();
 }