\begin{figure}[htbp]
\centering
\begin{minipage}[c]{0.3\textwidth}
\centering
\includegraphics[width=1\textwidth]{Pictures/Fig-face feature PCA results.png}
\caption{a果}
\label{fig:1}
\end{minipage}
\begin{minipage}[c]{0.3\textwidth}
\centering
\includegraphics[width=1\textwidth]{Pictures/Fig-Network-Architecture.png}
\caption{bbbbbbbb构}
\label{fig:2}
\end{minipage}
\begin{minipage}[c]{0.3\textwidth}
\centering
\includegraphics[width=1\textwidth]{Pictures/Fig-Pain intensity and pupile size relationship.png}
\caption{小ccccccccccccccccccccccccccc}
\label{fig:3}
\end{minipage}
\begin{minipage}[c]{0.3\textwidth}
\centering
\includegraphics[width=1\textwidth]{Pictures/Fig-Von Frey Pain Threshold.png}
\caption{不dddddddddddddddddddddd果}
\label{fig:4}
\end{minipage}
\begin{minipage}[c]{0.3\textwidth}
\centering
\includegraphics[width=1\textwidth]{Pictures/Fig-Model loss results.png}
\caption{训练eeeeeeeeeeeeeeeeeeeeeeeeeeeion}
\label{fig:5}
\end{minipage}
\begin{minipage}[c]{0.3\textwidth}
\centering
\includegraphics[width=1\textwidth]{Pictures/Fig-Model predict accuracy.png}
\caption{训练fffffffffffffffffffffffff确率}
\label{fig:6}
\end{minipage}
\end{figure}