class_docstr: Simple vocabulary wrapper.
class_docstr_tok: ["Simple","vocabulary","wrapper","."]
code: def __init__(self):
      self.word2idx = {}
      self.idx2word = {}
      self.idx = 0
  
file_path: pytorch-tutorial/tutorials/03-advanced/image_captioning/build_vocab.py
imports: import nltk
  import pickle
  import argparse
  from collections import Counter
  from pycocotools.coco import COCO
label_desc: Use image node_id 1 to create a new Vocabulary object from inherited base classes: object with example: obj = Vocabulary()