

%------------------------------------------------------------

\begin{tikzpicture}

\tikzstyle{rnnnode} = [draw,inner sep=4pt,minimum width=2em,minimum height=2em,rounded corners=1pt,fill=yellow!20]
\tikzstyle{snode} = [draw,inner sep=4pt,minimum width=2em,minimum height=2em,rounded corners=1pt,fill=red!20]
\tikzstyle{wode} = [inner sep=0pt,minimum width=2em,minimum height=2em,rounded corners=0pt]

\node [anchor=west,wode] (n1) at (0,0) {$y$};
\node [anchor=north west,wode] (n2) at ([xshift=3em,yshift=-2.5em]n1.south east) {$x$};
\node [anchor=south west,rnnnode] (n3) at ([xshift=8em,yshift=0.5em]n2.north east) {生成模型$G$};
\node [anchor=south east,wode] (n4) at ([xshift=-2em,yshift=0em]n3.north west) {$\tilde{y}$};
\node [anchor=south,snode] (n5) at ([xshift=0em,yshift=6em]n2.north) {判别网络$D$};
\node [anchor=west,align=left,font=\small] (n6) at ([xshift=15em,yshift=-3em]n5.east) {根据$(\seq{x},\seq{\tilde{y}})$生\\成奖励信号};


\draw [->,thick] ([xshift=0em,yshift=-0.3em]n1.north)--([xshift=-0.3em,yshift=-0.1em]n5.south);
\draw [->,thick] ([xshift=0em,yshift=0em]n2.north)--([xshift=0em,yshift=-0.1em]n5.south);
\draw [->,thick] ([xshift=0em,yshift=-0.5em]n4.north west)--([xshift=0.3em,yshift=-0.1em]n5.south);
\draw [->,thick] ([xshift=0em,yshift=0em]n3.north)--([xshift=0em,yshift=1em]n3.north)--([xshift=0em,yshift=0em]n4.east);


\draw [->,thick] ([xshift=0em,yshift=0em]n5.east) --  ([xshift=12.9em,yshift=0em]n5.east) --  ([xshift=1em,yshift=0em]n3.east) --  ([xshift=0em,yshift=0em]n3.east);

\draw [->,thick] ([xshift=0em,yshift=0em]n2.east) --  ([xshift=0em,yshift=-1.5em]n3.south) --  ([xshift=0em,yshift=0em]n3.south);

\begin{pgfonlayer}{background}

%\node [rectangle,inner sep=0.5em,rounded corners=5pt,very thick,dotted,draw=yellow] [fit = (n3) (n4)] (b1) {};
%\node [rectangle,inner sep=0.5em,rounded corners=5pt,very thick,dotted,draw=red] [fit = (n5)] (b2) {};
        
\end{pgfonlayer}

%\draw [->,thick] ([xshift=0em,yshift=0em]n3.south) .. controls +(south:1em) and +(north:1em) .. ([xshift=0em,yshift=0em]n5.north);


\end{tikzpicture}
