说明：  互信息,一个随机变量中包含另一个随机变量的信息量，可用于度量随机变量间的所有相关关系，包括线性相关关系和非线性相关关系。
(Mutual information, a random variable that contains information on another random variable, can be used to measure all the correlations between random variables, including linear correlations and non-linear correlations.)