Update viznet.py

viznet.py

@@ -44,9 +44,9 @@ class Viznet(datasets.GeneratorBasedBuilder):
                     }
                 )
                 for split in [
-                    datasets.Split.TRAIN,
-                    datasets.Split.VALIDATION, 
-                    datasets.Split.TEST
+                    "train",
+                    "valid",
+                    "test"
                 ]
             ]
         return []