code: def heatmaps(self):
      heatmaps_arr = np.float32([[0.0, 0.0, 1.0], [0.0, 0.0, 1.0]])
      return ia.HeatmapsOnImage(heatmaps_arr, shape=(2, 2, 3))
  
imports: from __future__ import print_function, division, absolute_import
  import sys
  import numpy
  import six.moves
  import imgaug
label_desc: Use image node_id 1 for calling the TestHeatmapsOnImage_pad_to_aspect_ratio obj's underlying member method code with example usage: obj.heatmaps() and returns: ia