class_docstr: A class that creates a grid of Axes. In matplotlib, the axes
  location (and size) is specified in the normalized figure
  coordinates. This may not be ideal for images that needs to be
  displayed with a given aspect ratio.  For example, displaying
  images of a same size with some fixed padding between them cannot
  be easily done in matplotlib. AxesGrid is used in such case.
code: def _init_axes_pad(self, axes_pad):
      axes_pad = _extend_axes_pad(axes_pad)
      self._axes_pad = axes_pad
  
      self._horiz_pad_size = Size.Fixed(axes_pad[0])
      self._vert_pad_size = Size.Fixed(axes_pad[1])
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import six
  import matplotlib.axes
  import matplotlib.cbook
  import matplotlib.ticker
  from matplotlib.gridspec import SubplotSpec
  from .axes_divider import Size, SubplotDivider, LocatableAxes, Divider
  from .colorbar import Colorbar
label_desc: Use image node_id 2 for calling the Grid obj's underlying member method code with example usage: obj._init_axes_pad(axes_pad) without return types