\begin{wraptable}{r}{7cm}
    \caption{Comparing methods producing $\pi^u$\looseness=-1}
    \label{tab:coupling_prob}
    \small
    \scalebox{0.86}{
    \begin{tabular}{c@{\hskip 0.08in}c@{\hskip 0.06in}c@{\hskip 0.06in}c@{\hskip 0.06in}c@{\hskip 0.08in}c@{\hskip 0.06in}c}
        \toprule
        \multirow{2}{*}{\textbf{Method}} & \multicolumn{2}{c}{\textbf{Citeulike-a}} & \multicolumn{2}{c}{\textbf{MovieLens}} & \multicolumn{2}{c}{\textbf{Cell Phones}}\\
        \cmidrule(r){2-3}\cmidrule(lr){4-5}\cmidrule(l){6-7}
        & R@10 & N@10 & R@10 & N@10 & R@10 & N@10\\
        \midrule
        \emph{Sinkhorn alg} & 0.2380 & 0.2455 & 0.0621 & 0.0506 & 0.1440 & 0.1315\\
        \emph{Soft-assign} & 0.2331 & 0.2417 & 0.0618 & 0.0500 & 0.1415 & 0.1292\\
        \emph{Diagonal} & 0.2260 & 0.2339 & 0.0581 & 0.0478 & 0.1394 & 0.1288\\
         \bottomrule
    \end{tabular}
    }
\end{wraptable}