class_docstr: A Base class for a worker manager. 
docstr: Closes all queries. 
docstr_tok: ["Closes","all","queries","."]
code: def close_all_queries(self):
      """Closes all queries."""
      raise NotImplementedError("Implement in a child class.")
  
imports: from __future__ import print_function
  from __future__ import division
  from argparse import Namespace
  from multiprocessing import Process
  import numpy
  import os
  import pickle
  import shutil
  import time
  from .exd_utils import EVAL_ERROR_CODE
label_desc: Use image node_id 5 for calling the AbstractWorkerManager obj's underlying member method code with example usage: obj.close_all_queries() without return types