code: def test_simple_case(self):
      layer = group_norm.GroupNorm(
          groups=5, create_scale=False, create_offset=False
      )
      inputs = jnp.ones([2, 3, 3, 10])
  
      outputs = layer(inputs)
      for x in np.nditer(outputs):
          self.assertEqual(x, 0.0)
  
imports: from absl.testing import absltest
  from absl.testing import parameterized
  from haiku._src import group_norm
  from haiku._src import initializers
  from haiku._src import test_utils
  import jax.numpy
  import numpy
label_desc: Use image node_id 1 for calling the GroupNormTest obj's underlying member method code with example usage: obj.test_simple_case() without return types