code: def __init__(self):
      self.word2id = dict()
      self.unk_id = 3
      self.word2id["<pad>"] = 0
      self.word2id["<s>"] = 1
      self.word2id["</s>"] = 2
      self.word2id["<unk>"] = 3
  
      self.id2word = {v: k for k, v in self.word2id.iteritems()}
  
imports: import argparse
  from collections import Counter
  from itertools import chain
  import torch
  from util import read_corpus
label_desc: Use image node_id 1 to create a new VocabEntry object from inherited base classes: object with example: obj = VocabEntry()