code: def find_available_hosts_and_slots(self):
      t = time.time()
      if self._last_reset_t is None:
          self._last_reset_t = t
      hosts = super().find_available_hosts_and_slots()
      if t - self._last_reset_t >= self._change_frequency_s:
          self.change_hosts(hosts)
          self._last_reset_t = t
      if self.verbose:
          print(f"Total hosts: {len(hosts)}")
      remaining = {
          k: v for k, v in hosts.items() if k not in self._removed_hosts
      }
      if self.verbose:
          print(f"Remaining hosts: {len(remaining)} -- {remaining}")
      return remaining
  
imports: from typing import Callable, List, Any, Dict, Optional, Tuple
  import logging
  import ray.exceptions
  import socket
  import time
  import os
  import random
  import math
  import threading
  from dataclasses import dataclass
  from horovod.ray.adapter import Adapter, BaseParams
  from horovod.runner.http.http_server import RendezvousServer
  from horovod.ray.utils import detect_nics
  from horovod.runner.elastic.rendezvous import create_rendezvous_handler
  from horovod.runner.gloo_run import create_slot_env_vars, create_run_env_vars, _get_min_start_hosts
  from horovod.ray.worker import BaseHorovodWorker
  from horovod.runner.elastic.discovery import HostDiscovery
  from horovod.runner.elastic.driver import ElasticDriver
  import ray
  import ray.exceptions
  from horovod.ray.worker import BaseHorovodWorker
  from horovod.ray.utils import detect_nics
label_desc: Use image node_id 5 for calling the TestDiscovery obj's underlying member method code with example usage: obj.find_available_hosts_and_slots() and returns: remaining