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.PS
# Masked_Autoencoder.m4
gen_init
NeedDpicTools

  circlerad = 0.2
  circlesep = 0.5
  rowsep = 0.9
  arrowht = arrowht*0.8
  arrowwid = arrowwid*1.4
  linethick = 1

define plan {
  m = 0
  for i=1 to 4 do {
    for j=1 to ncircles[i] do {
      exec sprintf("C[i,j]: circle thick 1.6 at Here \"\large\sf $%g\"",m+j)
      if i>1 then {
        if "$1"=="" then {
          for k=1 to ncircles[i-1] do { arrow from C[i,j] to C[i-1,k] chop } }
        }
      if j!=ncircles[i] then { move right_ circlesep from C[i,j] }
      }
    m += ncircles[i]
    case(i,
      move to C[1,1]+(-circlesep/2,-rowsep),
      move to C[2,1]+(0,-rowsep),
      move to C[3,1]+(circlesep/2,-rowsep), )
    }
  }
  gridsiz = 0.78/4
define grid { [ SW: 0,0
  for i=1 to $1 do {
    move to (0,(0.5-i)*gridsiz)
    exec sprintf("fv = $%g",2+i)
    for j=1 to $2 do { fl = 1-(int(fv / 2^(j-1)) % 2)
      box wid gridsiz ht gridsiz outlined "gray" shaded rgbstring(fl,fl,fl) }
    } ]}
define cxt {
  m = 1
  for i=2 to 4 do {
    for j=1 to ncircles[i] do {
      exec sprintf("narrows = $%g",m)
      for k=1 to narrows do {
        exec sprintf("cnum = $%g",m+k)
        arrow from C[i,j] to C[i-1,cnum] chop
        }
      m += narrows+1 
      } } }

  array(ncircles,3,4,4,3)
  plan()
  for j=1 to 3 do {
    sprintf("$\hat{x}_%g$",j) at C[1,j].n above
    sprintf("$x_%g$",j) at C[4,j].s+(0,-2bp__) below
    }
  "V" at 0.5 between C[2,1].w and C[1,1].w
  "W$^2$" at 0.5 between C[3,1].w and C[2,1].w
  "W$^1$" at 0.5 between C[3,1].w and C[4,1].w

GV: grid(3,4,0,15,6) with .w at C[2,4]+(circlerad*2,rowsep/2)
  "$=\hbox{M}^{\hbox{V}}$" at GV.e ljust
G2: grid(4,4,13,0,0,13) with .w at (GV.w,C[3,4]+(circlerad*2,rowsep/2))
  "$=\hbox{M}^{\hbox{V}^2}$" at G2.e ljust
G1: grid(4,3,1,5,1,1) with .w at (GV.w,C[4,3]+(circlerad*2,rowsep/2))
  "$=\hbox{M}^{\hbox{V}^1}$" at G1.e ljust

  move to (GV.x+3*circlesep,C[1,1].y)
  plan(3,1,2,1,2,2,1,2,1,2,2,3,1,2)
  for i=2 to 4 do {
    rgbdraw(0.5,0.5,0.5,
      cxt(2,1,3,0,0,2,1,3, 0,4,1,2,3,4,0,0, 0,4,1,2,3,4,0) )
    cxt(0,1,1,1,1,0, 2,2,3,0,2,2,3,2,2,3, 0,0,3,1,3,4)
    }
  for j=1 to 3 do { sprintf("$x_%g$",j) at C[4,j].s+(0,-2bp__) below }
  arrow dotted from C[1,2].n up circlesep/2; "$p(x_2)$" above
  "$p(x_3|x_2)$" at (C[1,3]+(circlesep/2,0),last "") above
  arrow dotted from C[1,3] to last "".s chop circlerad chop textoffset
  "$p(x_1|x_2,x_3)$" at (C[1,1]+(-circlesep/2,0),last "") above
  arrow dotted from C[1,1] to last "".s chop circlerad chop textoffset

.PE