\node[module, minimum width=8em] (encoder) at (0,0) {编码器组件};
\node[module,anchor=west, minimum width=8em] (decoder) at ([xshift=4em]encoder.east){解码器组件};
\node[module,anchor=west, minimum width=8em] (decoder2) at ([xshift=4em]decoder.east){解码器组件};
\node[module,anchor=north, minimum width=6em,font=\scriptsize,inner ysep=4pt] (deinput) at ([yshift=-2em]decoder2.south){解码端输入};
\node[anchor=south,font=\footnotesize] (mod1) at ([yshift=0.4em]encoder.north){\small\bfnew{编码器模块}};
\node[anchor=south,font=\footnotesize] (mod2) at ([yshift=0.4em]decoder.north){\small\bfnew{重排序模块}};
\node[anchor=south,font=\footnotesize] (mod3) at ([yshift=0.4em]decoder2.north){\small\bfnew{解码端}};
\begin{pgfonlayer}{background}
{
\node[box][fit=(encoder)(mod1)] (box1) {};
\node[box][fit=(decoder)(mod2)] (box2) {};
\node[box][fit=(decoder2)(mod3)] (box3) {};
}
\end{pgfonlayer}
\node[anchor=north,font=\scriptsize,align=center] (w1) at ([yshift=-2em]encoder.south){\scriptsize\bfnew{There exist different}\\\scriptsize\bfnew{opinions on this question}};
\node[anchor=north,font=\scriptsize,align=center] (w2) at ([yshift=-2em]decoder.south){\scriptsize\bfnew{There exist different}\\\scriptsize\bfnew{opinions on this question}};
\node[anchor=north,font=\scriptsize,text=gray] (w3) at ([yshift=0.6em]w2.south){\scriptsize\bfnew{(copy source sentence)}};
\node[anchor=south,font=\scriptsize,align=center] (w4) at ([yshift=1.6em]box2.north){\scriptsize\bfnew{on this question}\\\scriptsize\bfnew{There exist different opinions}};