code: def test_increase_max_value(self):
      # (0.0, 1.0) -> (0.0, 2.0)
      arr = np.float32([[0.0, 0.5, 1.0], [1.0, 0.5, 0.0]])
  
      observed = ia.HeatmapsOnImage.change_normalization(
          arr, (0.0, 1.0), (0.0, 2.0)
      )
  
      expected = np.float32([[0.0, 1.0, 2.0], [2.0, 1.0, 0.0]])
      assert np.allclose(observed, expected)
  
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_change_normalization obj's underlying member method code with example usage: obj.test_increase_max_value() without return types