code: public static double loss(double pred, double y, double eps)
      {
          final double x = Math.abs(pred - y);
          return Math.max(0, x-eps);
      }
docs: Computes the &epsilon;-insensitive loss
  
  @param pred the predicted value
  @param y the true value
  @param eps the epsilon tolerance
  @return the &epsilon;-insensitive loss