用到的package是：\usepackage{setspace}
命令：
\begin{spacing}{1.19}
\end{spaceing}
示例：
\makeatletter\def\@captype{table}\makeatother\begin{minipage}[t]{0.45\linewidth}
\scriptsize
\centering
\caption{\small{Popular nonconvex surrogate functions of $||\theta||_0$ and their supergradients.}}\vspace{0.3cm}
\label{tab_nonpenlty}
\centering
\begin{spacing}{1.19}
\begin{tabular}{l|l}
\hline
。。。。。。。。。。。。