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→定义 Definition
Let <math>(X,Y)</math> be a pair of random variables with values over the space <math>\mathcal{X}\times\mathcal{Y}</math>. If their joint distribution is <math>P_{(X,Y)}</math> and the marginal distributions are <math>P_X</math> and <math>P_Y</math>, the mutual information is defined as
Let <math>(X,Y)</math> be a pair of random variables with values over the space <math>\mathcal{X}\times\mathcal{Y}</math>. If their joint distribution is <math>P_{(X,Y)}</math> and the marginal distributions are <math>P_X</math> and <math>P_Y</math>, the mutual information is defined as
设一对随机变量<math>(X,Y)</math>，参数空间为<math>\mathcal{X}\times\mathcal{Y}</math>。若它们之间的的联合概率分布为<math>P_{(X,Y)}</math>，边际分布分别为<math>P_X</math>和<math>P_Y</math>，则它们之间的互信息定义为：
设一对随机变量<math>(X,Y)</math>，参数空间为<math>\mathcal{X}\times\mathcal{Y}</math>。若它们之间的的联合概率分布为<math>P_{(X,Y)}</math>，边际分布为<math>P_X</math>和<math>P_Y</math>，则它们之间的互信息定义为：