Fix runtime error.

.gitignore

@@ -1,2 +1,2 @@
-.database.sqlite
-.test.py
+database.sqlite
+test.py

execution_accuracy.py

@@ -80,8 +80,8 @@ class ExecutionAccuracy(evaluate.Metric):
             features=datasets.Features({
                 'predictions': datasets.Value('string'),
                 'references': datasets.Value('string'),
-                'execute_func': datasets.Value(),
-                'filter_func': datasets.Value(),
+                'execute_func': datasets.Value('0'),
+                'filter_func': datasets.Value('0'),
             }),
             # Homepage of the module for documentation
             homepage="http://module.homepage",