update compute

charmatch.py

@@ -71,9 +71,9 @@ class charmatch(evaluate.Metric):
             inputs_description="input expected output",
             # This defines the format of each prediction and reference
             features=datasets.Features({
-                'inputs': datasets.Value('string'),
-                'expected': datasets.Value('string'),
-                'outputs': datasets.Value('string')
+                'inputs': datasets.Sequence(datasets.Value('string')),
+                'expected': datasets.Sequence(datasets.Value('string')),
+                'outputs': datasets.Sequence(datasets.Value('string'))
             }),
             # Homepage of the module for documentation
             homepage="http://module.homepage",