latex表格斜杠

\begin{table} \centering \caption{This is a visual sample.} \begin{tabular}{c|ccccc} \toprule \diagbox {Sample}{Size} & 1 & 2 & 3 & 4 & {\bf 5} \\ \hline A & 0.22 & 0.32 & 0.76 & 0.34 & {\bf 0.77} \\ B & 0.23 & 0.12 & 0.75 & 0.45 & {\bf 0.97} \\ C & 7.45 & 6.56 & 6.65 & 6.98 & {\bf 5.78} \\ \bottomrule \end{tabular} \label{tab:Training_sizes} \end{table}