code: def test_groups_after_init():
      layers = InstanceNormalization()
      assert layers.groups == -1
  
imports: import pytest
  import numpy
  import tensorflow
  from tensorflow_addons.layers.normalizations import FilterResponseNormalization
  from tensorflow_addons.layers.normalizations import GroupNormalization
  from tensorflow_addons.layers.normalizations import InstanceNormalization
label_desc: Use image node_id 2 for calling a global function with example usage: test_groups_after_init() without return types