code: def get_blanc_prf(self):
      blanc_scores = tuple_to_metric(self.c_tuple, self.n_tuple)
      blanc_p, blanc_r, blanc_f = tuple(
          0.5 * (a + b) for (a, b) in zip(*blanc_scores)
      )
      return blanc_p, blanc_r, blanc_f
  
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 7 for calling the CorefEvaluator obj's underlying member method code with example usage: obj.get_blanc_prf() and returns: blanc_p,  blanc_r,  blanc_f