code: def __init__(self):
      self.iou = 0.0
      self.tp = 0
      self.fp = 0
      self.fn = 0
  
imports: from collections import defaultdict
  import numpy
  from paddlepanseg.cvlibs import build_info_dict
  from paddlepanseg.utils import decode_pan_id
  from .evaluator import Evaluator
label_desc: Use image node_id 1 to create a new PQStatCat object from inherited base classes: object with example: obj = PQStatCat()