class_docstr: Preparer for sequence labeling.
class_docstr_tok: ["Preparer","for","sequence","labeling","."]
code: def __init__(self, config):
      super().__init__(config)
      self.multi_text = True
  
file_path: delta/delta/data/preprocess/text_seq2seq_preparer.py
imports: import os
  from delta import utils
  from absl import logging
  from delta.data.preprocess.base_preparer import TextPreparer
  from delta.data import utils
  from delta.utils.register import registers
  from delta.data.preprocess.utils import prepare_vocab
  from delta.data.preprocess.utils import prepare_vocab_from_config
  from delta.data.preprocess.text_ops import load_textline_dataset
  from delta.data.utils.common_utils import get_file_len
label_desc: Use image node_id 1 to create a new TextS2SPreparer object from inherited base classes: TextPreparer with example: obj = TextS2SPreparer(config)