Fix iterator

itacola.py

@@ -142,5 +142,5 @@ class ItaCola(datasets.GeneratorBasedBuilder):
                     fields = fields[:-1], 
                 if ex_split is None or ex_split.strip() == split:
                     yield id_, {
-                        k:v.strip() for k,v in zip(features, fields)
+                        k:v.strip() for k,v in zip(features, fields[0])
                     }