fix typos

Author: Kucharssim

figures/coupling-layer-backward.svg

@@ -75,7 +75,7 @@ $$
 \begin{aligned}
 \hat{\phi}, \hat{\psi} = \operatorname*{argmin}_{\phi, \psi} & \mathbb{E}_{x \sim p(x)} \mathbb{KL}\big[p(\theta \mid x) || q_\phi(\theta \mid h_\psi(x))\big] = \\
 = \operatorname*{argmin}_{\phi, \psi} & \mathbb{E}_{x \sim p(x)} \mathbb{E}_{\theta \sim p(\theta \mid x)} \log \frac{p(\theta \mid x)}{q_\phi(\theta \mid h_\psi(x))} \propto \\
-\propto \operatorname*{argmin}_{\phi, \psi} & - \mathbb{E}_{(x, \theta) \sim p(x, \theta)} q_\phi(\theta \mid h_\psi(x)) \approx\\
+\propto \operatorname*{argmin}_{\phi, \psi} & - \mathbb{E}_{(x, \theta) \sim p(x, \theta)} \log q_\phi(\theta \mid h_\psi(x)) \approx\\
 \approx \operatorname*{argmin}_{\phi, \psi} & - \frac{1}{S}\sum_{s=1}^S \log q_\phi(\theta^{(s)} \mid h_\psi(x^{(s)}))
 \end{aligned}
 $$