%%%------------------------------------------------------------------------------------------------------------
\begin{tikzpicture}

\begin{scope}[yshift=6.5em,xshift=1em]
{
\setcounter{mycount1}{1}
\draw[step=0.5cm,color=orange,thick] (-1,-1) grid (1,1);
\foreach \y in {+0.75,+0.25,-0.25,-0.75}
  \foreach \x in {-0.75,-0.25,0.25,0.75}{
    \node [fill=orange!20,inner sep=0pt,minimum height=0.49cm,minimum width=0.49cm] at (\x,\y) {$\number\value{mycount1}$};
    \addtocounter{mycount1}{1};
  }
}
\node [anchor=south west] (label11) at (-1.3,0.9) {\footnotesize{\ding{172}}};
\end{scope}

\begin{scope}[yshift=6em,xshift=0.5em]
{
\setcounter{mycount2}{2}
\draw[step=0.5cm,color=blue,thick] (-1,-1) grid (1,1);
\foreach \y in {+0.75,+0.25,-0.25,-0.75}
  \foreach \x in {-0.75,-0.25,0.25,0.75}{
    \node [fill=blue!20,inner sep=0pt,minimum height=0.49cm,minimum width=0.49cm] at (\x,\y) {$\number\value{mycount2}$};
    \addtocounter{mycount2}{1};
  }
}
\node [anchor=south west] (label12) at (-1.3,0.9) {\footnotesize{\ding{173}}};
\end{scope}

\begin{scope}[yshift=5.5em,xshift=0em]
{
\setcounter{mycount3}{3}
\draw[step=0.5cm,color=ugreen,thick] (-1,-1) grid (1,1);
\foreach \y in {+0.75,+0.25,-0.25,-0.75}
  \foreach \x in {-0.75,-0.25,0.25,0.75}{
    \node [fill=green!20,inner sep=0pt,minimum height=0.49cm,minimum width=0.49cm] at (\x,\y) {$\number\value{mycount3}$};
    \addtocounter{mycount3}{1};
  }
}
\node [anchor=south west] (label13) at (-1.3,0.9) {\footnotesize{\ding{174}}};
\end{scope}

\begin{scope}[yshift=5em,xshift=-0.5em]
{
\setcounter{mycount4}{4}
\draw[step=0.5cm,color=red,thick] (-1,-1) grid (1,1);
\foreach \y in {+0.75,+0.25,-0.25,-0.75}
  \foreach \x in {-0.75,-0.25,0.25,0.75}{
    \node [fill=red!20,inner sep=0pt,minimum height=0.49cm,minimum width=0.49cm] at (\x,\y) {$\number\value{mycount4}$};
    \addtocounter{mycount4}{1};
  }
\node [anchor=north] (xlabel) at (0,-1.2) {$\mathbi{x}$};
}
\node [anchor=south west] (label14) at (-1.3,0.9) {\footnotesize{\ding{175}}};
\end{scope}

\begin{scope}[yshift=5em,xshift=1.5in]
{
\draw[step=0.5cm,thick] (-0.5,-1) grid (0.5,1.0);
\node [fill=black!20,inner sep=0pt,minimum height=0.49cm,minimum width=0.49cm] at (-0.25,0.75) {\small{$-1$}};
\node [fill=black!20,inner sep=0pt,minimum height=0.49cm,minimum width=0.49cm] at (-0.25,0.25) {$0$};
\node [fill=black!20,inner sep=0pt,minimum height=0.49cm,minimum width=0.49cm] at (-0.25,-0.25) {$1$};
\node [fill=black!20,inner sep=0pt,minimum height=0.49cm,minimum width=0.49cm] at (-0.25,-0.75) {$0$};
\node [fill=black!20,inner sep=0pt,minimum height=0.49cm,minimum width=0.49cm] at (0.25,0.75) {$0$};
\node [fill=black!20,inner sep=0pt,minimum height=0.49cm,minimum width=0.49cm] at (0.25,0.25) {\small{$-1$}};
\node [fill=black!20,inner sep=0pt,minimum height=0.49cm,minimum width=0.49cm] at (0.25,-0.25) {$1$};
\node [fill=black!20,inner sep=0pt,minimum height=0.49cm,minimum width=0.49cm] at (0.25,-0.75) {$0$};
\node [anchor=north] (xlabel) at (0,-1.2) {$\mathbi{W}$};
}

{\draw [->,thick,dashed] (-1.5in+2em+1.5em,-0.3) .. controls +(east:2) and +(west:1) .. (-0.55,0.8) node [pos=0.5,left] {\scriptsize{\textbf{矩阵乘}}};}
{\draw [->,thick,dashed] (-1.5in+2em+1.0em,-0.5) .. controls +(east:2) and +(west:1) .. (-0.55,0.8) ;}
{\draw [->,thick,dashed] (-1.5in+2em+0.5em,-0.7) .. controls +(east:2.5) and +(west:1) .. (-0.55,0.8) ;}
{\draw [->,thick,dashed] (-1.5in+2em,-0.9) .. controls +(east:3) and +(west:1) .. (-0.55,0.8);}
\end{scope}

\begin{scope}[yshift=6.5em,xshift=1em+3in]
{
\draw[step=0.5cm,color=orange,thick] (-0.5,-1) grid (0.5,1.0);
\foreach \y in {+0.75,+0.25,-0.25,-0.75}{
  \setcounter{mycount1}{2}
  \foreach \x in {-0.25,0.25}{
    \node [fill=orange!20,inner sep=0pt,minimum height=0.49cm,minimum width=0.49cm] at (\x,\y) {$\number\value{mycount1}$};
    \addtocounter{mycount1}{-1};
  }
}
}
\node [anchor=south west] (label21) at (-0.8,0.9) {\footnotesize{\ding{172}}};
\end{scope}

\begin{scope}[yshift=6em,xshift=0.5em+3in]
{
\draw[step=0.5cm,color=blue,thick] (-0.5,-1) grid (0.5,1.0);
\foreach \y in {+0.75,+0.25,-0.25,-0.75}{
  \setcounter{mycount1}{2}
  \foreach \x in {-0.25,0.25}{
    \node [fill=blue!20,inner sep=0pt,minimum height=0.49cm,minimum width=0.49cm] at (\x,\y) {$\number\value{mycount1}$};
    \addtocounter{mycount1}{-1};
  }
}
}
\node [anchor=south west] (label22) at (-0.8,0.9) {\footnotesize{\ding{173}}};
\end{scope}

\begin{scope}[yshift=5.5em,xshift=0em+3in]
{
\draw[step=0.5cm,color=ugreen,thick] (-0.5,-1) grid (0.5,1.0);
\foreach \y in {+0.75,+0.25,-0.25,-0.75}{
  \setcounter{mycount1}{2}
  \foreach \x in {-0.25,0.25}{
    \node [fill=green!20,inner sep=0pt,minimum height=0.49cm,minimum width=0.49cm] at (\x,\y) {$\number\value{mycount1}$};
    \addtocounter{mycount1}{-1};
  }
}
}
\node [anchor=south west] (label23) at (-0.8,0.9) {\footnotesize{\ding{174}}};
\end{scope}

\begin{scope}[yshift=5.0em,xshift=-0.5em+3in]
{
\draw[step=0.5cm,color=red,thick] (-0.5,-1) grid (0.5,1.0);
\foreach \y in {+0.75,+0.25,-0.25,-0.75}{
  \setcounter{mycount1}{2}
  \foreach \x in {-0.25,0.25}{
    \node [fill=red!20,inner sep=0pt,minimum height=0.49cm,minimum width=0.49cm] at (\x,\y) {$\number\value{mycount1}$};
    \addtocounter{mycount1}{-1};
  }
}
}
\node [anchor=south west] (label24) at (-0.8,0.9) {\footnotesize{\ding{175}}};
{
\node [anchor=north] (xlabel) at (0,-1.2) {${\mathbi{x}} \cdot {\mathbi{W}}$};
\node [anchor=center] (elabel) at (-0.7in,0) {\Huge{$\textbf{=}$}};
}
\end{scope}

\end{tikzpicture}

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

