Showing images side-by-side in Latex

ImagesSideBySide.tex

\begin{figure}
    \centering
    \begin{subfigure}[t]{0.45\columnwidth}
        \centering
        \includegraphics[width=\linewidth]{figures/figures_other/MnistExamples.png} 
        \caption{Generic} \label{fig:timing1}
    \end{subfigure}
    \hfill
    \begin{subfigure}[t]{0.45\columnwidth}
        \centering
        \includegraphics[width=\linewidth]{figures/figures_other/cifar10.jpeg} 
        \caption{Competitors} \label{fig:timing2}
    \end{subfigure}
    \caption{Some general caption of all the figures. In (\subref{fig:timing1}) you can see a  green square....}
\end{figure}