@Override
		public int compare(Integer o1, Integer o2) {
			// TODO Auto-generated method stub
			// Sort topic word index according to the probability of each word
			// in topic k
			if (sortProb[o1] > sortProb[o2])
				return -1;
			else if (sortProb[o1] < sortProb[o2])
				return 1;
			else
				return 0;
		}