public int getCountContainKeyWord(String key,String classFile, 
			Map<Integer, Map<String, Double>> classMap) {
		int ret = 0;
		Set<Integer> fileList = classMap.keySet();
		for (int file : fileList) {
			Map<String, Double> map = classMap.get(file);
			if (map.containsKey(key)) {
				ret++;
			}
		}
		return ret;
	}