Update aceval.py

aceval.py

@@ -109,8 +109,8 @@ class ACEVAL(datasets.GeneratorBasedBuilder):
     def _generate_examples(self, filepath):
         df = pd.read_excel(filepath, encoding="utf-8")
         for i, instance in enumerate(df.to_dict(orient="records")):
-            if "answer" not in instance.keys():
-                instance["answer"]=""
-            if "explanation" not in instance.keys():
-                instance["explanation"]=""
+            if "Answer" not in instance.keys():
+                instance["Answer"]=""
+            if "Explanation" not in instance.keys():
+                instance["Explanation"]=""
             yield i, instance