Fix definition of features in loading script

CrossWOZ.py

@@ -54,15 +54,15 @@ class CrossWOZ(datasets.GeneratorBasedBuilder):
                 "dialog_id": datasets.Value("string"),
                 "sys_id": datasets.Value("int32"),
                 "usr_id": datasets.Value("int32"),
-                "goal": datasets.Sequence((datasets.Value("string"),)),
+                "goal": datasets.Sequence([datasets.Value("string")]),
                 "task description": datasets.Sequence(datasets.Value("string")),
                 "type": datasets.Value("string"),
                 "messages": datasets.Sequence(
                     {
                         "content": datasets.Value("string"),
                         "role": datasets.Value("string"),
-                        "dialog_act": datasets.Sequence((datasets.Value("string"),)),
-                        "user_state": datasets.Sequence((datasets.Value("string"),)),
+                        "dialog_act": datasets.Sequence([datasets.Value("string")]),
+                        "user_state": datasets.Sequence([datasets.Value("string")]),
                         "sys_state": {
                             "景点": {
                                 "名称": datasets.Value("string"),
@@ -151,7 +151,7 @@ class CrossWOZ(datasets.GeneratorBasedBuilder):
                         },
                     }
                 ),
-                "final_goal": datasets.Sequence((datasets.Value("string"),)),
+                "final_goal": datasets.Sequence([datasets.Value("string")]),
             }
         )
         return datasets.DatasetInfo(