class_docstr: Base task for NLP.
class_docstr_tok: ["Base","task","for","NLP","."]
docstr: Pre-process batch.
  This function is not used in all nlp tasks.
docstr_tok: ["Pre-process","batch",".","This","function","is","not","used","in","all","nlp","tasks","."]
code: def preprocess_batch(self, batch):
      """
      Pre-process batch.
      This function is not used in all nlp tasks.
      """
      return batch
  
file_path: delta/delta/data/task/base_text_task.py
imports: import os
  from absl import logging
  from delta.data.task.base_task import Task
  from delta import utils
  from delta.utils.register import registers
  from delta.data.preprocess.text_ops import clean_english_str_tf
  from delta.data.preprocess.text_ops import char_cut_tf
  from delta.data.preprocess.text_ops import tokenize_sentence
  from delta.data.preprocess.text_ops import chinese_word_cut_tf
label_desc: Use image node_id 3 for calling the TextTask obj's underlying member method code with example usage: obj.preprocess_batch(batch) and returns: batch