code: def specialconvolve(a):
      # sorry, you must pad the input yourself
      rowconvol = a[1:-1, :] + a[:-2, :] + a[2:, :]
      colconvol = (
          rowconvol[:, 1:-1]
          + rowconvol[:, :-2]
          + rowconvol[:, 2:]
          - 9 * a[1:-1, 1:-1]
      )
      return colconvol
  
label_desc: Use image node_id 1 for calling a global function with example usage: specialconvolve(a) and returns: colconvol