Fixed minor bug in data loader script

squad_v2.py

@@ -131,7 +131,7 @@ class SquadV2(datasets.GeneratorBasedBuilder):
         # TODO(squad_v2): Yields (key, example) tuples from the dataset
         with open(filepath, encoding="utf-8") as f:
             data = json.load(f)
-            for id_, row in data["data"]:
+            for id_, row in enumerate(data["data"]):
                 # Features currently used are "context", "question", and "answers".
                 # Others are extracted here for the ease of future expansions.
                 yield id_, {