code: def metric_func(self):
      return self._metric_func
  
imports: from typing import Dict, List, Any
  import torchnet
  import torch
  from collections import OrderedDict
  from torch_points3d.models.model_interface import TrackerInterface
  from torch_points3d.metrics.base_tracker import BaseTracker, meter_value
  from torch_points3d.metrics.meters import APMeter
  from torch_points3d.datasets.segmentation import IGNORE_LABEL
  from torch_points3d.modules.VoteNet import VoteNetResults
  from torch_points3d.datasets.object_detection.box_data import BoxData
  from .box_detection.ap import eval_detection
label_desc: Use image node_id 9 for calling the ObjectDetectionTracker obj's underlying member method code with example usage: obj.metric_func() and returns: self