

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


   \begin{tikzpicture}
        \setlength{\base}{0.6cm}

        \tikzstyle{auxnode} = [inner sep=0pt,outer sep=0pt,opacity=0,draw=red,fill=red,circle,minimum size=3pt]
        \tikzstyle{wordnode} = [font=\scriptsize]
        \tikzstyle{opnode} = [inner sep=0pt,outer sep=0pt,draw,fill=green!30!white,font=\scriptsize,minimum size=10pt]
        \tikzstyle{standard} = [rounded corners=5pt,thick]
        \tikzstyle{emph} = [rounded corners=5pt,thick,draw=red]
        \tikzstyle{formulanode} = [font=\scriptsize,align=left,draw=red,rectangle,fill=red!10!white,rounded corners=2pt,drop shadow]

        % Skeleton
        \begin{scope}[every label/.append style={label distance=1pt,font=\tiny,inner sep=0pt,opacity=0}]
            \coordinate (aux12) at (0,0);
            %\node[auxnode,label={-45:12}] () at (aux12) {};

            \coordinate (aux22) at ([yshift=\base]aux12);
            %\node[auxnode,label={-45:22}] () at (aux22) {};
            \coordinate (aux23) at ([xshift=0.5\base]aux22);
            %\node[auxnode,label={-45:23}] () at (aux23) {};

            \coordinate (aux32) at ([yshift=0.4\base]aux22);
            %\node[auxnode,label={-45:32}] () at (aux32) {};

            \ExtractX{$([xshift=\base]aux23)$}
            \ExtractY{$([yshift=\base]aux32)$}
            \coordinate (aux44) at (\XCoord,\YCoord);
            %\node[auxnode,label={-45:44}] () at (aux44) {};
            \coordinate (aux45) at ([xshift=\base]aux44);
            %\node[auxnode,label={-45:45}] () at (aux45) {};
            \coordinate (aux46) at ([xshift=1.3\base]aux45);
            %\node[auxnode,label={-45:46}] () at (aux46) {};

            \ExtractX{$(aux23)$}
            \ExtractY{$([yshift=\base]aux44)$}
            \coordinate (aux53) at (\XCoord,\YCoord);
            %\node[auxnode,label={-45:53}] () at (aux53) {};
            \coordinate (aux56) at ([yshift=\base]aux46);
            %\node[auxnode,label={-45:56}] () at (aux56) {};

            \ExtractX{$(aux45)$}
            \ExtractY{$([yshift=0.5\base]aux56)$}
            \coordinate (aux65) at (\XCoord,\YCoord);
            %\node[auxnode,label={-45:65}] () at (aux65) {};

            \ExtractX{$([xshift=-\base]aux12)$}
            \ExtractY{$([yshift=\base]aux65)$}
            \coordinate (aux71) at (\XCoord,\YCoord);
            %\node[auxnode,label={-45:71}] () at (aux71) {};
            \coordinate (aux75) at ([yshift=\base]aux65);
            %\node[auxnode,label={-45:75}] () at (aux75) {};
            \ExtractX{$(aux56)$}
            \ExtractY{$(aux75)$}
            \coordinate (aux76) at (\XCoord,\YCoord);
            %\node[auxnode,label={-45:76}] () at (aux76) {};
            \coordinate (aux78) at ([xshift=1.7\base]aux76);
            %\node[auxnode,label={-45:78}] () at (aux78) {};

            \coordinate (aux87) at ([shift={(0.7\base,1.3\base)}]aux76);
            %\node[auxnode,label={-45:87}] () at (aux87) {};
        \end{scope}

        \begin{scope}
            \node[opnode,circle,opacity=0] (r53) at (aux53) {};
            \node[opnode,circle,opacity=0] (z56) at (aux56) {};
            \node[opnode,circle,opacity=0] (z75) at (aux75) {};
            \node[opnode,circle,opacity=0] (z76) at (aux76) {};
            % reset gate
            {
                \draw[-latex,emph] (aux12) -- (aux32) -| (aux44) |- (r53);
                \draw[emph] (aux71) -| (aux32) -| (aux44);
                \node[opnode,circle,draw=red,thick] () at (aux44) {$\sigma$};
            }
           {
                \draw[-latex,standard] (aux12) -- (aux32) -| (aux44) |- (r53);
                \draw[standard] (aux71) -| (aux32) -| (aux44);
                \node[opnode,circle] () at (aux44) {$\sigma$};
            }
            % update gate
           {
                \draw[-latex,emph] (aux12) -- (aux32) -| (aux45) -- (z75);
                \draw[-latex,emph] (aux71) -| (aux32) -| (aux45) |- (z56);
                \node[opnode,circle,draw=red,thick] () at (aux45) {$\sigma$};
                \node[opnode,rectangle,rounded corners=2pt,inner sep=2pt,font=\tiny,draw=red,thick] () at (aux65) {$1-$};
            }
            
        \end{scope}

        \begin{scope}
            \node[wordnode,anchor=south] () at (aux71) {$\mathbi{h}_{t-1}$};
            \node[wordnode,anchor=west] () at (aux12) {$\mathbi{x}_t$};
            
        \end{scope}
        
        \node[] (Tanh) at (aux46){};

        \begin{pgfonlayer}{background}
            \node[draw,very thick,rectangle,fill=blue!10!white,rounded corners=5pt,inner sep=6pt,fit=(aux22) (aux76) (z76) (Tanh)] (GRU) {};
        \end{pgfonlayer}


    \end{tikzpicture}