docstr: See base class.
code: def default_encoding_stage(self):
      """See base class."""
      return stages_impl.IdentityEncodingStage()
  
imports: import itertools
  from absl.testing import parameterized
  import numpy
  import tensorflow
  from tensorflow_model_optimization.python.core.internal.tensor_encoding.stages import stages_impl
  from tensorflow_model_optimization.python.core.internal.tensor_encoding.testing import test_utils
label_desc: Use image node_id 1 for calling the IdentityEncodingStageTest obj's underlying member method code with example usage: obj.default_encoding_stage() and returns: stages_impl