add utils

lm_eval/tasks/afrixnli/native-direct/utils.py

+from sklearn.metrics import f1_score
+
+
+def weighted_f1_score(items):
+    unzipped_list = list(zip(*items))
+    golds = unzipped_list[0]
+    preds = unzipped_list[1]
+    fscore = f1_score(golds, preds, average="weighted")
+    return fscore