Update race.py

race.py

@@ -37,7 +37,7 @@ class Race(datasets.GeneratorBasedBuilder):
         features = datasets.Features(
                 {
                     "article": datasets.Value("string"),
-                    "problems": datasets.features.Sequence(datasets.Value("string")),
+                    "problems": datasets.Value("string"),
                 }
             )
         return datasets.DatasetInfo(