code: def _merge_lists(listA, listB, maxN, key):
      result = []
      indA, indB = 0, 0
      while (indA < len(listA) or indB < len(listB)) and len(
          result
      ) < maxN:
          if (indB < len(listB)) and (
              indA >= len(listA) or key(listA[indA]) < key(listB[indB])
          ):
              result.append(listB[indB])
              indB += 1
          else:
              result.append(listA[indA])
              indA += 1
      return result
  
imports: import itertools
  import logging
  import os.path
  import tempfile
  import warnings
  from collections import OrderedDict, defaultdict
  from typing import Dict, List, Optional, Sequence, Union
  import numpy
  import torch
  from mmengine.dist import all_gather_object, broadcast_object_list, is_main_process
  from mmengine.evaluator import BaseMetric
  from mmengine.evaluator.metric import _to_cpu
  from mmengine.fileio import get_local_path
  from mmengine.logging import MMLogger, print_log
  from terminaltables import AsciiTable
  from mmdet.registry import METRICS
  from mmdet.structures.mask import encode_mask_results
  from ..functional import eval_recalls
  from .coco_metric import CocoMetric
label_desc: Use image node_id 1 for calling a global function with example usage: _merge_lists(listA, listB, maxN, key) and returns: result