# This trains a kohonen net on the digits data.  Try turning on the
# periodicBoundary flag in the map group.

set cols 8
set rows 8
addNet kohonen
deleteGroups bias
addGroup input 64 INPUT
addGroup map [expr $rows * $cols] DISTANCE KOHONEN
connectGroups input map

# This junk group is necessary because the example set has targets.  It isn't
# functional, otherwise.
addGroup junk 10 OUTPUT -CROSS_ENTROPY

setObj map.numColumns   $cols
setObj randMean         0.5
setObj randRange        0.5
setObj input.numColumns 8
setObj batchSize        100
setObj numUpdates       2000
setObj momentum         0.0
resetNet

loadExamples hand-digits.trn.bex -s train -e PERMUTED
loadExamples hand-digits.tst.bex -s test

proc setNeighborhood {} {
  set updates [getObj totalUpdates]
  if {$updates % 50} return
  if {$updates == 0} {
    setObj map.neighborhood 6
  } else {
    setObj map.neighborhood [expr 0.9 * [getObj map.neighborhood] + 0.1]
  }	
  puts "Neighborhood = [getObj map.neighborhood]"
}
setObj preEpochProc setNeighborhood

resetPlot $cols
plotAll map
plotRow 1
plotAll input
drawUnits