code: def __repr__(self):
      s = (
          "iou: "
          + str(self.iou)
          + " tp: "
          + str(self.tp)
          + " fp: "
          + str(self.fp)
          + " fn: "
          + str(self.fn)
      )
      return s
  
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 3 for calling the PQStatCat obj's underlying member method code with example usage: obj.__repr__() and returns: s