class_docstr: A single training instance (sentence pair).
class_docstr_tok: ["A","single","training","instance","(","sentence","pair",")","."]
code: def __repr__(self):
      return self.__str__()
  
imports: import argparse
  import logging
  import io
  import os
  import glob
  import collections
  import warnings
  import random
  import time
  from multiprocessing import Pool
  import numpy
  from gluonnlp.models.bert import BertModel, BertForPretrain, get_pretrained_bert
  import gluonnlp
label_desc: Use image node_id 3 for calling the TrainingInstance obj's underlying member method code with example usage: obj.__repr__() and returns: self