code: def pad(self, pad):
      for child in self.children:
          child.shift([pad[0][0], pad[1][0]])
  
      self.shape[0] += pad[0][0] + pad[0][1]
      self.shape[0] += pad[1][0] + pad[1][1]
  
imports: import numpy
  import tensorflow
  import lucid.modelzoo.vision_models
  import lucid.optvis.objectives
  import lucid.optvis.param
  import lucid.optvis.render
  from lucid.misc.io import show, load
  from lucid.misc.io.showing import _image_url, _display_html
  from collections import defaultdict
  from lucid.scratch.pretty_graphs.graph import *
label_desc: Use image node_id 3 for calling the FragmentContainer obj's underlying member method code with example usage: obj.pad(pad) without return types