Add top-level sequence

natural_unit_conversion.py

@@ -28,7 +28,7 @@ class CustomUnitConversionDataset(datasets.GeneratorBasedBuilder):
 
     return datasets.DatasetInfo(
       description=_DESCRIPTION,
-      features=datasets.Features(
+      features=datasets.Features(datasets.features.Sequence(
         {
           "text": datasets.Value("string"),
           "entities": datasets.features.Sequence(
@@ -38,7 +38,7 @@ class CustomUnitConversionDataset(datasets.GeneratorBasedBuilder):
               "ner_tag": datasets.Value("string")
             }
           )
-        }
+        })
       ),
       supervised_keys=None,
       homepage='https://huggingface.co/datasets/maliknaik/natural_unit_conversion',