\begin{figure}
    \centering
    \begin{subfigure}{0.35\linewidth}
    \includegraphics[width=\textwidth]{figure/image1.png}
        \caption{Training with raw data}
    \end{subfigure}
    \hspace{4mm}   
    \begin{subfigure}{0.58\linewidth}
    \includegraphics[width=\textwidth]{figure/image2.png}
        \caption{Training with synthetic data}
    \end{subfigure}
    \caption{Risk propagation of training a learning model with synthetic data instead of raw data.}
\end{figure}