\begin{figure*}[!ht]
%\vskip 0.2in
\begin{center}
\centerline{\includegraphics[width=0.7\textwidth]{mitrend.pdf}}
\caption{The mutual information $I(\mathbf{x}, \mathbf{z})$ with respect to training epoch.}
\label{fig:mi}
\end{center}
%\vskip -0.2in
\end{figure*}