fixed bug on target class for subgroup

bias_auc.py

@@ -76,7 +76,7 @@ class BiasAUC(evaluate.Metric):
         """Returns label and output score from `targets` and `labels`
         if `subgroup` is in list of targeted groups found in `targets`
         """
-        target_class = target_class if target_class is not None else 0
+        target_class = target_class if target_class is not None else 1
         for target, label, result in zip(targets, labels, outputs):
             if subgroup in target:
                  yield label, result[target_class]