code: def __init__(
      self,
      p2p: P2P,
      schema_hash: bytes,
      dht: DHT,
      *,
      servicer_type: Type[ServicerBase],
      prefix: str,
      target_group_size: Optional[int],
      min_group_size: int,
      min_matchmaking_time: float,
      request_timeout: float,
      client_mode: bool,
      initial_group_bits: str = "",
  ):
      assert (
          "." not in prefix
      ), "group prefix must be a string without ."
      if (
          request_timeout is None
          or request_timeout >= min_matchmaking_time
      ):
          logger.warning(
              "It is recommended to use request_timeout smaller than min_matchmaking_time. Otherwise,"
              " matchmaking can cause deadlocks in some rare cases. Please see Matchmaking docstring."
          )
  
      super().__init__()
      self._p2p = p2p
  
      if not issubclass(servicer_type, ServicerBase):
          raise TypeError(
              "`servicer_type` is expected to be a ServicerBase subclass"
          )
      self._servicer_type = servicer_type
      self._prefix = prefix
  
      self.peer_id = p2p.peer_id
      self.schema_hash = schema_hash
      self.group_key_manager = GroupKeyManager(
          dht, prefix, initial_group_bits, target_group_size
      )
      self.target_group_size, self.min_group_size = (
          target_group_size,
          min_group_size,
      )
      self.min_matchmaking_time, self.request_timeout = (
          min_matchmaking_time,
          request_timeout,
      )
      self.client_mode = client_mode
  
      self.lock_looking_for_group = asyncio.Lock()
      self.lock_request_join_group = asyncio.Lock()
      self.follower_was_discarded = asyncio.Event()
      self.was_accepted_to_group = asyncio.Event()
      self.assembled_group = asyncio.Future()
  
      self.current_leader: Optional[
          PeerID
      ] = None  # iff i am a follower, this is a link to my current leader
      self.current_followers: Dict[
          PeerID, averaging_pb2.JoinRequest
      ] = {}  # my current followers excluding myself
      self.potential_leaders = PotentialLeaders(
          self.peer_id, min_matchmaking_time, target_group_size
      )
      self.step_control: Optional[StepControl] = None
  
imports: from __future__ import annotations
  import asyncio
  import concurrent.futures
  import contextlib
  import random
  from math import isfinite
  from typing import AsyncIterator, Dict, Optional, Set, Tuple, Type
  from hivemind.averaging.control import StepControl
  from hivemind.averaging.group_info import GroupInfo
  from hivemind.averaging.key_manager import GroupKey, GroupKeyManager
  from hivemind.dht import DHT, DHTID
  from hivemind.p2p import P2P, P2PContext, P2PDaemonError, P2PHandlerError, PeerID, ServicerBase
  from hivemind.proto import averaging_pb2
  from hivemind.utils import DHTExpiration, TimedStorage, get_dht_time, get_logger, timed_storage
  from hivemind.utils.asyncio import anext, cancel_and_wait
label_desc: Use image node_id 1 to create a new Matchmaking object  with example: obj = Matchmaking(p2p, schema_hash, dht)