code: def accumulate(self):
      for coco_eval in self.coco_eval.values():
          coco_eval.accumulate()
  
imports: import json
  import copy
  from collections import defaultdict
  import numpy
  import torch
  import torch._six
  from pycocotools.cocoeval import COCOeval
  from pycocotools.coco import COCO
  import pycocotools.mask
  from .distributed_utils import all_gather
label_desc: Use image node_id 4 for calling the CocoEvaluator obj's underlying member method code with example usage: obj.accumulate() without return types