randomfilledmatrix.tex

\documentclass[tikz,border=14pt, dvipsnames]{standalone}
\usepackage{tikz}
\usetikzlibrary{matrix,shapes,decorations.pathreplacing, backgrounds, positioning}
\usepackage{amssymb}

\begin{document}
    \begin{tikzpicture}[
        %Styles
        Matrix/.style={
            matrix of nodes,
            text height=2.5ex,
            text depth=0.75ex,
            text width=8.0ex,
            align=center,
            column sep=0pt, row sep=0pt,
            nodes={draw=black!50},
            nodes in empty cells,
        }
    ]

%data frame

\matrix[Matrix] at(0,0) (tM){ % Matrix contents  
    &  & \\
    &  &  \\
    &  & \\
    &  & \\
    &  & \\
    &  &  \\
    &  &  \\
    &  &  \\
    &  &  \\
    &  &  \\
};

\foreach \y in {1,2,3} {
      \foreach \x in {1,2,3,4} {
          \pgfmathparse{0.9*rnd+0.3}
          \definecolor{MyColor}{cmyk}{0,0,\pgfmathresult,0}
          \node[fill=MyColor,
          text height=2.2ex, text depth=0.73ex,
          text width=7.7ex] at (tM-\x-\y){}; 
      }
}

\foreach \y in {1,2,3} {
      \foreach \x in {5,6,7} {
          \pgfmathparse{0.9*rnd+0.3}
          \definecolor{MyColor}{cmyk}{\pgfmathresult,0,0,0}
          \node[fill=MyColor,
          text height=2.2ex, text depth=0.73ex,
          text width=7.7ex] at (tM-\x-\y){}; 
      }
}

\foreach \y in {1,2,3} {
      \foreach \x in {8,9,10} {
          \pgfmathparse{0.9*rnd+0.3}
          \definecolor{MyColor}{cmyk}{0,\pgfmathresult,0,0}
          \node[fill=MyColor,
          text height=2.2ex, text depth=0.73ex,
          text width=7.7ex] at (tM-\x-\y){}; 
      }
}


\matrix[Matrix, left = of tM, xshift = +20pt](X){ % Matrix contents  
\checkmark \\
      \\
     \\
     \\
\checkmark \\
      \\
      \\
     \\
\checkmark \\
    \\
};

\node[yshift = 20pt, draw, circle](labV) at (tM-1-2.north){$V$};
\node[yshift = 15pt, draw, circle, fill=gray, text=white](labX) at (X.north){$x_n$};

\path[decorate, decoration ={brace, mirror}, draw]
  (X-1-1.north west) -- (X-4-1.south west) node[midway, rotate=90, yshift = 10pt]{sample};

  \path[decorate, decoration ={brace, mirror}, draw]
  (X-5-1.north west) -- (X-7-1.south west) node[midway, rotate=90, yshift = 10pt]{modality};

    \path[decorate, decoration ={brace, mirror}, draw]
  (X-8-1.north west) -- (X-10-1.south west) node[midway, rotate=90, yshift = 10pt]{feature};


\end{tikzpicture}
\end{document}