code: def test_correctness_instance_norm(self):
      instance_norm_layer = layers.GroupNormalization(
          groups=4, axis=-1, scale=False, center=False
      )
  
      inputs = np.array([[[-1.0, 1.0, 0, 2.0], [1.0, 3.0, -4, -2.0]]])
  
      expected_instance_norm_output = np.array(
          [[[-1.0, -1.0, 1.0, 1.0], [1.0, 1.0, -1.0, -1.0]]]
      )
  
      self.assertAllClose(
          instance_norm_layer(inputs),
          expected_instance_norm_output,
          atol=1e-3,
      )
  
file_path: keras/keras/layers/normalization/group_normalization_test.py
imports: import numpy
  import pytest
  from keras import constraints
  from keras import layers
  from keras import regularizers
  from keras import testing
label_desc: Use image node_id 6 for calling the GroupNormalizationTest obj's underlying member method code with example usage: obj.test_correctness_instance_norm() without return types