code: def test_simple_case(self, use_fast_variance):
      layer = layer_norm.LayerNorm(
          [1, 2],
          create_scale=False,
          create_offset=False,
          use_fast_variance=use_fast_variance,
          param_axis=-1,
      )
      inputs = np.ones([2, 3, 3, 5])
  
      outputs = layer(inputs)
      for x in np.nditer(outputs):
          self.assertEqual(x, 0.0)
  
imports: import functools
  import itertools
  from absl.testing import absltest
  from absl.testing import parameterized
  from haiku._src import initializers
  from haiku._src import layer_norm
  from haiku._src import test_utils
  from haiku._src import transform
  import jax
  import jax.numpy
  import numpy
label_desc: Use image node_id 3 for calling the LayerNormTest obj's underlying member method code with example usage: obj.test_simple_case(use_fast_variance) without return types