code: def wids2sent(cls, wids, d_vocab):
      return " ".join([d_vocab[w] for w in wids])
  
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 3 for calling the ParseInsuranceQA obj's underlying member method code with example usage: obj.wids2sent(cls, wids, d_vocab) and returns: str