\documentclass{article}
\usepackage{com.braju.graphicalmodels}
\usepackage{amsmath}
% \special{papersize=40mm,80mm}
% \setlength{\pdfpagewidth}{40mm}
% \setlength{\pdfpageheight}{80mm}
% \usepackage[vcentering,dvips]{geometry}
% \geometry{papersize={80mm,120mm},total={80mm,120mm},margin=0mm}



\catcode`\@=11%

\pagestyle{empty}

\begin{document}
\TeXtoEPS

\LARGE
\psset{unit=10mm,arrowscale=1.5,linewidth=1.5pt}

\begin{pspicture}(0,0)(12,6)
  \SpecialCoor

  \psset{hatchsep=12pt}
  \psframe(1,1)(3,5)
  \rput(4,3){$\simeq$}

  % U_L
  \psframe(5,1)(6.5,5)
  \rput(5.75,5.4){\Large $L$}
  
  % S_L
  \psframe(7.5,3.5)(9,5)  
  \rput(7.80,4.60){\large $\sigma_1$}
  \rput(8.25,4.25){\large $\ddots$}
  \rput(8.70,3.90){\large $\sigma_L$}
  \rput(8.25,5.4){\Large $L$}   
  
  % V_L
  \psframe(10,3.5)(12,5)   
  \rput(11,5.4){\Large $D$}
  \rput(12.4,4.25){\Large $L$}

  \rput(2,5.4){\Large $D$}
  \rput(0.5,3){\Large $N$}
  
  \rput(2,0){$\boldsymbol{X}$}
  \rput(4,0){$\simeq$}
  \rput(5.75,0){$\boldsymbol{U}_L$}
  \rput(8.25,0){$\boldsymbol{S}_L$}
  \rput(11,0){$\boldsymbol{V}^T_L$}
         
\end{pspicture}

\endTeXtoEPS
\end{document}