code: def backward(self, indexes, ggx):
      return GetItem(self.slices).apply(ggx)
  
imports: import numpy
  import chainer
  from chainer import backend
  from chainer import function_node
  from chainer import utils
  from chainer.utils import type_check
  from chainer import variable
  import chainerx
label_desc: Use image node_id 3 for calling the GetItemGrad obj's underlying member method code with example usage: obj.backward(indexes, ggx) and returns: GetItem