.

code_eval.py

@@ -146,8 +146,8 @@ class CodeEval(evaluate.Metric):
             features=datasets.Features(
                 {
                     # sequence of dictionaries
-                    "predictions": datasets.Sequence(defaultdict(lambda: None)),
-                    "references": datasets.Sequence(defaultdict(lambda: None)),
+                    "predictions": datasets.Sequence(defaultdict(lambda: datasets.Value("string"))),
+                    "references": datasets.Sequence(defaultdict(lambda: datasets.Value("string"))),
                 }
             ),
             homepage="https://github.com/openai/human-eval",