\begin{figure}[!ht]
    \begin{subfigure}{\columnwidth}
        \centering
        \input{figures/prototype_update_text/citeulike}
        % \vspace*{-5mm}
        \caption{Results on CiteULike-a}
    \end{subfigure}
    \\
    \begin{subfigure}{\columnwidth}
        \centering
        \input{figures/prototype_update_text/cellphones}
        % \vspace*{-5mm}
        \caption{Results on Cell Phones}
    \end{subfigure}
    \\
    \begin{subfigure}{\columnwidth}
        \centering
        \input{figures/prototype_update_text/movielens}
        % \vspace*{-5mm}
        \caption{Results on MovieLens}
    \end{subfigure}
    \\
    \begin{subfigure}{\columnwidth}
        \centering
        \input{figures/prototype_update_text/videogames}
        % \vspace*{-5mm}
        \caption{Results on Video Games}
    \end{subfigure}%
    \caption{\ourmethod's performance w.r.t. the number of prototype update steps $L^t$ in text encoder $\mathcal{E}^t$.}
    \label{fig:text_prototype_update}
\end{figure}