介紹了有關熵的概念及計算方法，并將其應用于構建一類新的分布估計算法(EDAs)。該類分布估計算法用基于最大熵估計種群中的模式概率分布和從最大熵分布中抽樣取代遺傳算法(GA)的交叉和變異，產生新的種群。在該類算法中，二階連接模式算法由于只使用了連接模式，在解決變量之間相互作用趨向于發生在串中相互靠近的變量之間的一類問題時，比遺傳算法更好。
關 鍵 詞 熵; 抽樣; 模式; 模式族

Abstract After introducing some concepts and computations of entropy, a new type of estimation of distribution algorithms (EDAs) is developed by using principle of maximum entropy. This type of algorithms replaces the crossover and mutation operators used by genetic algorithm (GA) with the estimation of the maximum entropy distribution of schema in the population and sampling from maximum entropy distribution to generate new population. Among this type of algorithms, only contiguous schemata are used in order-2 contiguous schemata algorithm. Therefore, order-2 contiguous schemata algorithm may work better than GA when interactions between variables tend to be between variables that are located close to each other on the string.
Key words entropy; sampling; schema; schema family