class_docstr: Analogous to a gridspec, and contained in another LayoutGrid.
class_docstr_tok: ["Analogous","to","a","gridspec",",","and","contained","in","another","LayoutGrid","."]
code: def add_child(self, child, i=0, j=0):
      # np.ix_ returns the cross product of i and j indices
      self.children[np.ix_(np.atleast_1d(i), np.atleast_1d(j))] = child
  
imports: import itertools
  import kiwisolver
  import logging
  import numpy
  import matplotlib
  import matplotlib.patches
  from matplotlib.transforms import Bbox
label_desc: Use image node_id 6 for calling the LayoutGrid obj's underlying member method code with example usage: obj.add_child(child, i, j) without return types