code: def __getitem__(self, word):
      return self.word2id.get(word, self.unk_id)
  
imports: import argparse
  from collections import Counter
  from itertools import chain
  import torch
  from util import read_corpus
label_desc: Use image node_id 2 for calling the VocabEntry obj's underlying member method code with example usage: obj.__getitem__(word) and returns: self