code: def read_vocab(cls, vocab_path):
      d_vocab = {}
      with PathManager.open(vocab_path, "r") as f:
          for line in f:
              fields = line.rstrip("\n").split("\t")
              if len(fields) != 2:
                  raise ValueError(
                      "vocab file (%s) corrupted. Line (%s)"
                      % (repr(line), vocab_path)
                  )
              else:
                  wid, word = fields
                  d_vocab[wid] = word
      return d_vocab
  
imports: from typing import Optional
  import gzip
  import os
  from parlai.core.build_data import DownloadableFile
  from parlai.utils.io import PathManager
  import parlai.core.build_data
label_desc: Use image node_id 4 for calling the ParseInsuranceQA obj's underlying member method code with example usage: obj.read_vocab(cls, vocab_path) and returns: d_vocab