code: def test_shuffle_layer_log_times_is_identity(self):
      seq_len = 8
      d_model = 17
      shuffle_layer = rse.ShuffleLayer()
      x = _input_with_indice_as_values(seq_len, d_model)
      _, _ = shuffle_layer.init(shapes.signature(x))
      y = x
      for _ in range(int(np.log2(seq_len))):
          y = shuffle_layer(y)
      self._assert_equal_tensors(x, y)
  
file_path: trax/trax/models/research/rse_test.py
imports: from absl.testing import absltest
  import numpy
  from trax import shapes
  from trax.models.research import rse
label_desc: Use image node_id 3 for calling the RSETest obj's underlying member method code with example usage: obj.test_shuffle_layer_log_times_is_identity() without return types