code: def test_no_parameters(self):
      hm = iadata.quokka_heatmap()
      assert hm.shape == (643, 960, 3)
      assert hm.arr_0to1.shape == (643, 960, 1)
      assert np.allclose(
          np.average(hm.arr_0to1), 0.57618505, rtol=0, atol=1e-3
      )
  
imports: from __future__ import print_function, division, absolute_import
  import warnings
  import sys
  import numpy
  import imgaug
  import imgaug.data
  from imgaug.data import _quokka_normalize_extract, _compute_resized_shape
label_desc: Use image node_id 1 for calling the Test_quokka_heatmap obj's underlying member method code with example usage: obj.test_no_parameters() without return types