code: def informedness(self, idx):
      return (
          self.true_positive_rate(idx)
          + self.true_negative_rate(idx)
          - 1
      )
  
imports: import logging
  from collections import OrderedDict
  import numpy
  from sklearn import metrics
  from sklearn.metrics import confusion_matrix
label_desc: Use image node_id 26 for calling the ConfusionMatrix obj's underlying member method code with example usage: obj.informedness(idx) and returns: unknown