code: def __init__(self):
      self.iou = 0.0
      self.tp = 0
      self.fp = 0
      self.fn = 0
  
file_path: PaddleSeg/contrib/PanopticDeepLab/utils/evaluation/panoptic.py
imports: from collections import defaultdict, OrderedDict
  import numpy
label_desc: Use image node_id 1 to create a new PQStatCat object  with example: obj = PQStatCat()