code: def get_prf(self):
      return (
          self.get_precision(),
          self.get_recall(),
          self.get_f1(),
          self.get_blanc_prf(),
      )
  
imports: import logging
  import numpy
  from collections import Counter, defaultdict
  from scipy.optimize import linear_sum_assignment
  from .blanc import blanc, tuple_to_metric
label_desc: Use image node_id 8 for calling the CorefEvaluator obj's underlying member method code with example usage: obj.get_prf() and returns: self,  self,  self,  self