Utility functions的用法和样例：
例句
- Secondly, to extract learning samples from the MADM problem, an approach to estimating the utility functions for attributes is presented.
其次，提出了基于属性效用函数估计的学习样本构造方法，从决策问题本身抽取学习样本。 - In the first part of this paper, we introduce briefly the background and recent research of recursive utility.
本文第一章首先对递归效用函数的背景及研究近况作了一个简要的介绍。
