code: def __call__(self, target, prediction):
      return self.metric_function(target, prediction)
  
imports: from collections import OrderedDict
  from contextlib import suppress
  import numpy
  import pandas
  from typing import Dict, Iterable, List, Tuple, Union
  from sklearn import metrics
  from sklearn.utils.multiclass import type_of_target, unique_labels
label_desc: Use image node_id 4 for calling the Metric obj's underlying member method code with example usage: obj.__call__(target, prediction) and returns: self