\begin{figure*}[htbp]
\centering
#小标题
\subfigure[Case study in terms of interpretability on dataset HDep3.]{
\begin{minipage}[t]{0.37\linewidth} %linewidth小于0.5
\centering
\includegraphics[scale=0.2]{figures/hdep3d.png} #大小主要调节scale.
%\caption{fig1}
\end{minipage}%
}%
#小标题
\subfigure[Case study in terms of interpretability on dataset HDep5.]{
\begin{minipage}[t]{0.37\linewidth} %linewidth小于0.5
\centering
\includegraphics[scale=0.2]{figures/hdep5d.png}
%\caption{fig2}
\end{minipage}%
}%

\centering#下面这个是大标题
\caption{Illustration of TTAN’s interpretability on datasets HDep3 and HDep5.}
\label{fig:interp2}
\end{figure*}