code: def testRange(self, shape, gain, dtype):
      init = initializers.Identity(gain)
      value = init(shape, dtype)
      self.assertEqual(value.shape, shape)
      np.testing.assert_almost_equal(
          value.mean(), gain / shape[-1], decimal=4
      )
      np.testing.assert_almost_equal(value.max(), gain, decimal=4)
  
imports: import itertools
  from absl.testing import absltest
  from absl.testing import parameterized
  from haiku._src import initializers
  from haiku._src import test_utils
  import jax
  from jax import config
  import jax.numpy
  import numpy
label_desc: Use image node_id 8 for calling the InitializersTest obj's underlying member method code with example usage: obj.testRange(shape, gain, dtype) without return types