Rename start_char to answer_start to match HF convention

quranqa.py

@@ -84,7 +84,7 @@ class QuranQA(datasets.GeneratorBasedBuilder):
                     "answers": datasets.features.Sequence(
                         {
                             "text": datasets.Value("string"),
-                            "start_char": datasets.Value("int32"),
+                            "answer_start": datasets.Value("int32"),  # Originally start_char
                         }
                     ),
                 }
@@ -127,5 +127,10 @@ class QuranQA(datasets.GeneratorBasedBuilder):
             samples = f.readlines()
         samples = [json.loads(s) for s in samples]
         for sample in samples:
+            # Remap key names to match HF convention
+            sample["answers"] = {
+                "text": [answer["text"] for answer in sample["answers"]],
+                "answer_start": [answer["start_char"] for answer in sample["answers"]]
+            }
             yield key, sample
             key += 1