code: def get_precision(self):
      return 0 if self.p_num == 0 else self.p_num / float(self.p_den)
  
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 5 for calling the Evaluator obj's underlying member method code with example usage: obj.get_precision() and returns: unknown