\definecolor{ublue}{rgb}{0.152,0.250,0.545}
\definecolor{ugreen}{rgb}{0,0.5,0}



%%% outline
%-------------------------------------------------------------------------


%%% 简易机器翻译系统 - step 3 decoding - example


\begin{tikzpicture}


\begin{scope}[scale=0.4]
{\footnotesize
\node [anchor=west,draw,thick,minimum width=2.8em, minimum height=2.0em,fill=green!30,drop shadow](num1) at (0,0) {C};
\node [anchor=north,circle,draw,thick,minimum width=2.0em,fill=red!30,drop shadow](num1-1) at ([yshift=-5.0em]num1.south) {正};
\draw [->,very thick,ublue]([yshift=-0.2em]num1.south) -- ([yshift=0.2em]num1-1.north);

%%%%%%%%%%%%%%%%%%%%%%%%%%
\node [anchor=west,draw,thick,minimum width=2.8em, minimum height=2.0em,fill=green!30,drop shadow](num2) at ([xshift=5.2em]num1.east)  {B};
\node [anchor=north,circle,draw,thick,minimum width=2.0em,fill=red!30,drop shadow](num2-1) at ([yshift=-5.0em]num2.south) {正};
\draw [->,very thick]([xshift=0.2em]num1.east) -- ([xshift=-0.2em]num2.west);
\draw [->,very thick,ublue]([yshift=-0.2em]num2.south) -- ([yshift=0.2em]num2-1.north);

%%%%%%%%%%%%%%%%%%%%%%%%%%
\node [anchor=west,draw,thick,minimum width=2.8em, minimum height=2.0em,fill=green!30,drop shadow](num3) at ([xshift=5.2em]num2.east)  {A};
\node [anchor=north,circle,draw,thick,minimum width=2.0em,fill=red!30,drop shadow](num3-1) at ([yshift=-5.0em]num3.south) {反};
\draw [->,very thick]([xshift=0.2em]num2.east) -- ([xshift=-0.2em]num3.west);
\draw [->,very thick,ublue]([yshift=-0.2em]num3.south) -- ([yshift=0.2em]num3-1.north);

%%%%%%%%%%%%%%%%%%%%%%%%%%
\node [anchor=west,draw,thick,minimum width=2.8em, minimum height=2.0em,fill=green!30,drop shadow](num4) at ([xshift=5.2em]num3.east)  {B};
\node [anchor=north,circle,draw,thick,minimum width=2.0em,fill=red!30,drop shadow](num4-1) at ([yshift=-5.0em]num4.south) {反};
\draw [->,very thick]([xshift=0.2em]num3.east) -- ([xshift=-0.2em]num4.west);
\draw [->,very thick,ublue]([yshift=-0.2em]num4.south) -- ([yshift=0.2em]num4-1.north);

%%%%%%%%%%%%%%%%%%%%%%%%%%
\node [anchor=west,draw,thick,minimum width=2.8em, minimum height=2.0em,fill=green!30,drop shadow](num5) at ([xshift=5.2em]num4.east)  {C};
\node [anchor=north,circle,draw,thick,minimum width=2.0em,fill=red!30,drop shadow](num5-1) at ([yshift=-5.0em]num5.south) {正};
\draw [->,very thick]([xshift=0.2em]num4.east) -- ([xshift=-0.2em]num5.west);
\draw [->,very thick,ublue]([yshift=-0.2em]num5.south) -- ([yshift=0.2em]num5-1.north);

%%%%%%%%%%%%%%%%%%%%%%%%%%
\node [anchor=west,draw,thick,minimum width=2.8em, minimum height=2.0em,fill=green!30,drop shadow](num6) at ([xshift=5.2em]num5.east)  {A};
\node [anchor=north,circle,draw,thick,minimum width=2.0em,fill=red!30,drop shadow](num6-1) at ([yshift=-5.0em]num6.south) {反};
\draw [->,very thick]([xshift=0.2em]num5.east) -- ([xshift=-0.2em]num6.west);
\draw [->,very thick,ublue]([yshift=-0.2em]num6.south) -- ([yshift=0.2em]num6-1.north);

\node [anchor=north](word1) at ([xshift=2.5em,yshift=-3.0em]num1-1.south)  {图示说明：};
\node [anchor=north,draw,thick,minimum width=2.8em, minimum height=2.0em,fill=green!30,drop shadow](word2) at ([xshift=-2.5em,yshift=-3.0em]word1.south)  {C};
\node [anchor=west](word2-2) at ([xshift=1.5em]word2.east)  {一个隐含状态};
\node [anchor=north,circle,draw,thick,minimum width=2.0em,fill=red!30,drop shadow](word3) at ([xshift=-2.5em,yshift=-12.2em]word1.south) {正};
\node [anchor=west](word3-2) at ([xshift=2.1em]word3.east)  {一个可见状态};

\draw [->,very thick]([xshift=6.4em]word2-2.east) -- ([xshift=11.6em]word2-2.east);
\node [anchor=west](word4) at ([xshift=13.1em]word2-2.east)  {从一个隐含状态到下一个};
\node [anchor=west](word4-1) at ([xshift=13.1em,yshift=-4.0em]word2-2.east)  {隐含状态的转换};

\draw [->,very thick,ublue]([xshift=30.7em,yshift=-0.2em]word3.north) -- ([xshift=30.7em,yshift=0.2em]word3.south);

\node [anchor=west](word5) at ([xshift=13.1em,yshift=-9.5em]word2-2.east)  {从一个隐含状态到可见状};
\node [anchor=west](word5-1) at ([xshift=13.1em,yshift=-13.5em]word2-2.east)  {态的输出};
}
\end{scope}

\end{tikzpicture}