class_docstr: Sequence length 128, 50% scrambled.
class_docstr_tok: ["Sequence","length","128",",","50","%","scrambled","."]
code: def sequence_length(self):
      return 128
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import subprocess
  import numpy
  from tensor2tensor.data_generators import generator_utils
  from tensor2tensor.data_generators import problem
  from tensor2tensor.data_generators import text_encoder
  from tensor2tensor.data_generators import text_problems
  from tensor2tensor.utils import registry
  import tensorflow.compat.v1
label_desc: Use image node_id 1 for calling the LanguagemodelWikiScrambleL128 obj's underlying member method code with example usage: obj.sequence_length() and returns: int