code: def _labeledInput(activeInputs, cellsPerCol=32):
    
    if cellsPerCol == 0:
      cellsPerCol = 1
    cols = activeInputs.size / cellsPerCol
    activeInputs = activeInputs.reshape(cols, cellsPerCol)
    (cols, cellIdxs) = activeInputs.nonzero()
  
    if len(cols) == 0:
      return "NONE"
  
    items = ["(%d): " % (len(cols))]
    prevCol = -1
    for (col,cellIdx) in zip(cols, cellIdxs):
      if col != prevCol:
        if prevCol != -1:
          items.append("] ")
        items.append("Col %d: [" % col)
        prevCol = col
  
      items.append("%d," % cellIdx)
  
    items.append("]")
    return " ".join(items)
docs: Print the list of [column, cellIdx] indices for each of the active
    cells in activeInputs.