return 1 - (sum1 / sum2);
return 1 - (sum / (a.abs() + b.abs()));
	public double getSimilarity() {		double sum1 = 0.0, sum2 = 0.0;		int count = getQuery().getElementsCount();		for (int i = 0; i < count; i++) {			Membership m1 = getQuery().getMembership(i);			Membership m2 = getTarget().getMembership(i);			sum1 += m1.minus(m2).abs();			sum2 += m1.plus(m2).abs();		}		return 1 - (sum1 / sum2);	}