modify features

ecqa.py

@@ -101,8 +101,8 @@ class ecqa(evaluate.Metric):
             inputs_description=_KWARGS_DESCRIPTION,
             # This defines the format of each prediction and reference
             features=datasets.Features({
-                'predictions': datasets.Value('int64'),
-                'references': datasets.Value('int64'),
+                'predictions': datasets.Value('string'),
+                'references': datasets.Value('string'),
             }),
             # Homepage of the module for documentation
             homepage="http://module.homepage",