code: def test_getset_bits():
      dht = hivemind.DHT(start=True)
      averager = DecentralizedAverager(
          [torch.randn(3)],
          dht=dht,
          start=True,
          prefix="test_prefix",
          target_group_size=2,
      )
      averager.set_group_bits("00101011101010")
      assert averager.get_group_bits() == "00101011101010"
  
imports: import random
  import time
  import numpy
  import pytest
  import torch
  import hivemind
  from hivemind.averaging import DecentralizedAverager
  from hivemind.averaging.allreduce import AveragingMode
  from hivemind.averaging.control import AveragingStage
  from hivemind.averaging.key_manager import GroupKeyManager
  from hivemind.averaging.load_balancing import load_balance_peers
  from hivemind.averaging.partition import AllreduceException
  from hivemind.p2p import PeerID
  from test_utils.dht_swarms import launch_dht_instances
label_desc: Use image node_id 15 for calling a global function with example usage: test_getset_bits() without return types