\begin{table}%t2
\caption{\label{tab2}Result of classification for three situations.}
%\centering
\par
\begin{tabular}{rllllll}
\hline
\hline
&1&&2&&3\\
\hline
Classified$\downarrow$known$\to$& AGNs &S\&G& AGNs &S\&G& AGNs &S\&G\\
\hline
        AGNs & 1475  & 151&1574& 112&1598&226 \\
        S\&G & 181  &3740& 82  &3779&58&3665\\
\hline
 Accuracy   & 89.0\% & 96.0\%& 95.0\%&97.0\%&96.5\%&94.0\%\\
\hline
Total accuracy&94.0\% &&96.5\% &&94.9\%\\
\hline
\end{tabular}
\end{table}