\begin{table}[!ht]
    \centering
    \caption{\ourmethod's performance w.r.t. the number iterations $L^t$ to update text prototypes.}
    \label{tab:text_iter}
    % \small
    \scalebox{0.86}{
    \begin{tabular}{c
                    cc
                    cc
                    cc
                    cc}
        \toprule
        \multirow{3}{*}{\bm{$L^t$}} & \multicolumn{2}{c}{\textbf{CiteULike-a}} & \multicolumn{2}{c}{\textbf{Cell Phones}} & \multicolumn{2}{c}{\textbf{Video Games}} & \multicolumn{2}{c}{\textbf{MovieLens}}\\
        \cmidrule(lr){2-3}\cmidrule(lr){4-5}\cmidrule(lr){6-7}\cmidrule(lr){8-9}
        & R@10 & N@10 & R@10 & N@10 & R@10 & N@10 & R@10 & N@10\\
        \midrule
        1 & \textbf{24.17} & \textbf{24.70} & \textbf{6.66} & \textbf{5.35} & \textbf{8.92} & \textbf{5.76} & \textbf{14.35} & \textbf{13.14}\\
        2 & 24.14 & 24.63 & 6.56 & 5.31 & 8.86 & 5.67 & 13.92 & 12.72\\
        3 & 23.84 & 24.50 & 6.63 & 5.34 & 8.85 & 5.62 & 13.90 & 12.66\\
        4 & 23.59 & 24.27 & 6.59 & 5.31 & 8.68 & 5.58 & 13.78 & 12.52\\
         \bottomrule
    \end{tabular}
    }
\end{table}