class_docstr: Adafactor.
code: def _decay_rate_default(self):
      return adafactor_decay_rate_pow()
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import functools
  import re
  import gin
  from mesh_tensorflow import layers
  from mesh_tensorflow import ops_with_redefined_builtins
  import tensorflow.compat.v1
label_desc: Use image node_id 5 for calling the AdafactorOptimizer obj's underlying member method code with example usage: obj._decay_rate_default() and returns: adafactor_decay_rate_pow