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→作为分布差异的有效信息
<math>
<math>
ei(f,Y_0)=-D_{KL}(U||P(\tilde{X}|\tilde{Y}=Y_0,f)=\frac{1}{N}\sum_{\tilde{X}}\log\frac{P(\tilde{Y_0}|\tilde{X})}{P(\tilde{Y_0})}
ei(f,Y_0)=-D_{KL}(U||P(\tilde{X}|\tilde{Y}=Y_0,f)=\log N+\frac{1}{N}\sum_{\tilde{X}}\log\frac{P(\tilde{Y_0}|\tilde{X})}{P(\tilde{Y_0})}
</math>
</math>