code: def acquire_bucket(self) -> Tuple[Optional[Bucket], int]:
      pass
  
imports: import logging
  import random
  from abc import ABC, abstractmethod
  from collections import defaultdict
  from statistics import mean
  from typing import Dict, List, NamedTuple, Optional, Set, Tuple
  from torchbiggraph.config import BucketOrder
  from torchbiggraph.distributed import Startable
  from torchbiggraph.rpc import Client, Server
  from torchbiggraph.stats import Stats, StatsHandler
  from torchbiggraph.types import Bucket, EntityName, Partition, Rank, Side
label_desc: Use image node_id 2 for calling the AbstractBucketScheduler obj's underlying member method code with example usage: obj.acquire_bucket() without return types