class_docstr: Wikitext-103, token-level, with examples up to 4,096 tokens long.
code: def max_length(self, model_hparams):
      return model_hparams.split_to_length or self.sequence_length
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import collections
  import os
  import zipfile
  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 2 for calling the LanguagemodelWikitext103L4k obj's underlying member method code with example usage: obj.max_length(model_hparams) and returns: unknown