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→一维函数映射
<math>
<math>
\begin{aligned}
\begin{aligned}
\int_{-\frac{L}{2}}^{\frac{L}{2}}\int_{f([-\frac{L}{2},\frac{L}{2}])}p(x_0)p(y|x_0)\ln p(y)dydx_0\approx \frac{1}{2L}\int_{-L}^{\frac{L}{2}}\ln f'(x_0)dx_0
\int_{-\frac{L}{2}}^{\frac{L}{2}}\int_{f([-\frac{L}{2},\frac{L}{2}])}p(x_0)p(y|x_0)\ln p(y)dydx_0\approx \frac{1}{L}\int_{-\frac{L}{2}}^{\frac{L}{2}}\ln f'(x_0)dx_0
\end{aligned}
\end{aligned}
</math>
</math>