Revert "update eval"

This reverts commit 62a7d11b.

convlab2/dst/dstc9/utils.py

-import json
 import os
+import json
 import zipfile
+from copy import deepcopy
 
 from convlab2 import DATA_ROOT
 
@@ -22,16 +23,16 @@ def prepare_data(subtask, split, data_root=DATA_ROOT):
             for i in range(0, len(turns), 2):
                 sys_utt = turns[i - 1]['text'] if i else None
                 user_utt = turns[i]['text']
-                dialog_state = {}
+                state = {}
                 for domain_name, domain in turns[i + 1]['metadata'].items():
                     if domain_name in ['警察机关', '医院', '公共汽车']:
                         continue
-                    state = {}
+                    domain_state = {}
                     for slots in domain.values():
                         for slot_name, value in slots.items():
-                            state[slot_name] = value
-                    dialog_state[domain_name] = state
-                dialog_data.append((sys_utt, user_utt, dialog_state))
+                            domain_state[slot_name] = value
+                    state[domain_name] = domain_state
+                dialog_data.append((sys_utt, user_utt, state))
             data[dialog_id] = dialog_data
     else:
         for dialog_id, dialog in test_data.items():