class_docstr: A class to read TED talk dataset
      
class_docstr_tok: ["A","class","to","read","TED","talk","dataset"]
code: def add_target_token(self, list_, lang_id):
      new_list = list()
      token = "__" + lang_id + "__"
      for sent in list_:
          new_list.append(token + " " + sent)
      return new_list
  
imports: import itertools
  import os
  import csv
  from collections import defaultdict
  from six.moves import zip
  import io
  import wget
  import sys
  from subprocess import check_call, check_output
label_desc: Use image node_id 6 for calling the MultiLingualAlignedCorpusReader obj's underlying member method code with example usage: obj.add_target_token(list_, lang_id) and returns: new_list