class_docstr: Packed version for TPU.
class_docstr_tok: ["Packed","version","for","TPU","."]
code: def max_segment_length(self):
      return 256
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  from tensor2tensor.data_generators import text_encoder
  from tensor2tensor.data_generators import text_problems
  from tensor2tensor.layers import modalities
  from tensor2tensor.utils import registry
  import tensorflow.compat.v1
label_desc: Use image node_id 3 for calling the Seq2editsTextnormPacked256 obj's underlying member method code with example usage: obj.max_segment_length() and returns: int