code: def denoise_z15():
      """Replace tokens instead of masking."""
      hparams = xmoe2_dense_0()
      hparams.decoder_type = "denoising"
      hparams.noising_spec_train = {
          "type": "random_zipfian",
          "prob": 0.15,
      }
      hparams.noising_use_eval_during_train = 0.25
      return hparams
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from tensor2tensor.models import mtf_transformer
  from tensor2tensor.models import mtf_transformer2
  from tensor2tensor.models.research import moe
  from tensor2tensor.utils import registry
label_desc: Use image node_id 33 for calling a global function with example usage: denoise_z15() and returns: hparams