code: def accumulate(self):
      logger.info("Accumulating evaluatation results...")
      self.map_stat = self.AP_accum[0] / (
          self.AP_accum_count[0] + 1e-16
      )
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import copy
  import sys
  import math
  from collections import defaultdict
  import numpy
  from ppdet.modeling.bbox_utils import bbox_iou_np_expand
  from .map_utils import ap_per_class
  from .metrics import Metric
  from .munkres import Munkres
  from ppdet.utils.logger import setup_logger
label_desc: Use image node_id 4 for calling the JDEDetMetric obj's underlying member method code with example usage: obj.accumulate() without return types