class_docstr: Class for computing metrics based on one StructuredDataset.
docstr: Compute difference of the metric for unprivileged and privileged
  groups.
code: def difference(self, metric_fun):
      """Compute difference of the metric for unprivileged and privileged
      groups.
      """
      return metric_fun(privileged=False) - metric_fun(privileged=True)
  
file_path: AIF360/aif360/metrics/dataset_metric.py
imports: import numpy
  from aif360.datasets import StructuredDataset
  from aif360.metrics import Metric, utils
label_desc: Use image node_id 3 for calling the DatasetMetric obj's underlying member method code with example usage: obj.difference(metric_fun) and returns: unknown