code: def list_hparams(prefix=None):
      hp_names = sorted(Registries.hparams)
      if prefix:
          hp_names = [
              name for name in hp_names if name.startswith(prefix)
          ]
      return hp_names
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import collections
  from tensor2tensor.utils import misc_utils
  import tensorflow.compat.v1
  from tensorflow.python.util import tf_inspect
label_desc: Use image node_id 11 for calling a global function with example usage: list_hparams(prefix) and returns: hp_names