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== Definition ==
== Definition ==
The conditional entropy of <math>Y</math> given <math>X</math> is defined as
The conditional entropy of <math>Y</math> given <math>X</math> is defined as
在给定<math>X</math>的情况下，<math>Y</math>的条件熵定义为：
在给定<math>X</math>的情况下，<math>Y</math>的条件熵定义为：
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