code: def _convert_bufs(bs):
      if bs is None:
          return []
      else:
          return pickle.loads(bytes(bs))
  
imports: import json
  import os
  from datetime import datetime
  from dateutil.parser import parse
  from tornado import ioloop
  from traitlets import Dict, Instance, List, Unicode
  from ..util import ensure_timezone, extract_dates
  from .dictdb import BaseDB
label_desc: Use image node_id 4 for calling a global function with example usage: _convert_bufs(bs) and returns: list, pickle