code: def choose_location(
      self,
      cores: int,
      local_ssd_data_disk: bool,
      data_disk_size_gb: int,
      preemptible: bool,
      regions: List[str],
      machine_type: str,
  ) -> str:
      if (
          self._default_region in regions
          and self.global_live_cores_mcpu // 1000 < 1_000
      ):
          regions = [self._default_region]
      return self.location_monitor.choose_location(
          cores,
          local_ssd_data_disk,
          data_disk_size_gb,
          preemptible,
          regions,
          machine_type,
      )
  
imports: import asyncio
  import collections
  import logging
  import re
  import secrets
  from typing import Any, Counter, Dict, List, Optional, Tuple
  import sortedcontainers
  from gear import Database
  from gear.time_limited_max_size_cache import TimeLimitedMaxSizeCache
  from hailtop import aiotools
  from hailtop.utils import periodically_call, secret_alnum_string, time_msecs
  from ...globals import INSTANCE_VERSION, live_instance_states
  from ...instance_config import QuantifiedResource
  from ..instance import Instance
  from ..location import CloudLocationMonitor
  from ..resource_manager import CloudResourceManager, UnknownVMState, VMDoesNotExist, VMStateCreating, VMStateRunning, VMStateTerminated
label_desc: Use image node_id 3 for calling the InstanceCollectionManager obj's underlying member method code with example usage: obj.choose_location(cores, local_ssd_data_disk, data_disk_size_gb, preemptible, regions, machine_type) and returns: self