
\begin{table*}[t]
    \caption{Ablation study for the proposed \acf{SRA} approach. We denote $\mathcal{L}_{\mathrm{IND}}$ as the in-domain loss, $\mathcal{L}_{\mathrm{CRD}}$ as the cross-domain loss, and E2H as easy-to-hard. We train the domain adaptation from \acl{K19} to \acl{K16}. Only $1\%$ of the source domain \acl{K19} labels are used, and no labels for the target domain \acl{K16}. We report F1 and weighted F1 score for classes and average (all) respectively.}
    \label{tbl:cross-domain-ablation}
    %\begin{center}
    \centering
    \begin{footnotesize}
    \begin{threeparttable}
    \begin{tabular}{l|ccc|rrrrrrrrrr}
    \toprule
    \toprule
    Model & $\mathcal{L}_{\mathrm{IND}}$ & $\mathcal{L}_{\mathrm{CRD}}$ & E2H & TUM & STR & LYM & DEB & NORM & ADI & BACK & ALL\\
    \midrule
    SRA\tnote{$\dagger$} & - & - & - & 36.8\tnote{**} & 45.4\tnote{**} & 27.1\tnote{**} & 30.8\tnote{**} & 45.2\tnote{**} & 43.1\tnote{**} & 43.6\tnote{**} & 38.9\tnote{**} \\
    SRA & - & $\checkmark$ & - & 14.1\tnote{**} & 9.1\tnote{**} & 0.2\tnote{**} & 10.1\tnote{**} & 4.9\tnote{**} & 0.0\tnote{**} & 61.5\tnote{**} & 14.4\tnote{**} \\
    SRA & $\checkmark$ & - & - & 88.1\tnote{**} & \textbf{72.8}\tnote{+} & 78.0\tnote{*} & 71.8\tnote{*} & 89.9\tnote{**} & 93.4\tnote{*} & 86.0\tnote{*} & 82.9\tnote{**}\\
    SRA & $\checkmark$ & $\checkmark$ & - & 63.0\tnote{**} & 69.9\tnote{**} & \textbf{85.1} & 57.7\tnote{**} & \textbf{98.2} & \textbf{97.9} & 90.0\tnote{**} & 80.3\tnote{**} \\
    SRA & $\checkmark$ & $\checkmark$ & $\checkmark$ & \textbf{93.4} & \textbf{72.9} & 82.7\tnote{*} & \textbf{67.9} & 96.5\tnote{*} & 97.0\tnote{**} & \textbf{97.2} & \textbf{86.9} \\
    \bottomrule
    \bottomrule
    \end{tabular}
    \begin{tablenotes}
        \item[$\dagger$] Model jointly trained. Both source and target dataset are merged assuming a similar distribution.
        \item[+] $\ p\geq0.05$; $^{*}\ p<0.05$; $^{**}\ p<0.001$; unpaired t-test with respect to top result.
    \end{tablenotes}
    \end{threeparttable}
    \end{footnotesize}
\end{table*}


