latex 设置multirow模板

\begin{table}[h]

\renewcommand{\arraystretch}{1.3}

\caption{CPU SPSO vs. GPU PSO-TM(N=1024)}

\begin{center}

\begin{tabular}{|l|l|l|l|l|l|} \hline

\multicolumn{1}{|c|}{\raisebox{-1.50ex}[0cm][0cm]{\!Function\!}}

&\multicolumn{2}{c|}{CPU SPSO}

&\multicolumn{2}{c|}{GPU PSO-TM}

&\multicolumn{1}{|c|}{\raisebox{-1.50ex}[0cm][0cm]{\!\textbf{Speedup}\!}}\\ \cline{2-5}

& Mean & Time & Mean & Time & \\

\hline Akley &0 &12.3 &0 &1.5 &\textbf{8.2} \\

\hline Rastrigin &37.64 &155.6 &\textbf{7.91} &9.4 &\textbf{16.6} \\

\hline Ellipse &0 &10.1 &0 &1.4 &\textbf{7.2}\\

\hline Rosenbrock &0.003 &76.7 &0.009 &9.4 &\textbf{8.2} \\

\hline

\end{tabular}

\label{Table_GPU2}

\end{center}

\end{table}