static void initFeature() {
		
		Random rand = new Random();
		
		for(int i = 0; i < DataInfo.userNumber; i++)
			for(int j = 0; j < DataInfo.featureNumber; j++)
				DataInfo.userFeature[i][j] = 0.01 * rand.nextDouble();
		
		for(int i = 0; i < DataInfo.itemNumber; i++)
			for(int j = 0; j < DataInfo.featureNumber; j++)
				DataInfo.itemFeature[i][j] = 0.01 * rand.nextDouble();
	}