【keyerror :0】我在参加【零基础入门推荐系统 - 新闻推荐】时，特征工程这一块给训练集打标签是出现这个问题

问题遇到的现象和发生背景

我在参加【零基础入门推荐系统 - 新闻推荐】时，特征工程这一块给训练集打标签是出现这个问题

问题相关代码，请勿粘贴截图

#get_user_recall_item_label_df()是我定义的一个打标签函数
# 给训练验证数据打标签，并负采样（这一部分时间比较久）
trn_user_item_label_df, val_user_item_label_df, tst_user_item_label_df = get_user_recall_item_label_df(click_trn_hist, 
                                                                                                       click_val_hist, 
                                                                                                       click_tst_hist,
                                                                                                       click_trn_last, 
                                                                                                       click_val_last, 
                                                                                                       recall_list_df)
trn_user_item_label_df.label

#将召回数据转换成字典
# 将最终的召回的df数据转换成字典的形式做排序特征
def make_tuple_func(group_df):
    row_data = []
    for name, row_df in group_df.iterrows():
        row_data.append((row_df['sim_item'], row_df['score'], row_df['label']))
    
    return row_data

trn_user_item_label_tuples = trn_user_item_label_df.groupby('user_id').apply(make_tuple_func).reset_index()
trn_user_item_label_tuples_dict = dict(zip(trn_user_item_label_tuples['user_id'], trn_user_item_label_tuples[0]))

if val_user_item_label_df is not None:
    val_user_item_label_tuples = val_user_item_label_df.groupby('user_id').apply(make_tuple_func).reset_index()
    val_user_item_label_tuples_dict = dict(zip(val_user_item_label_tuples['user_id'], val_user_item_label_tuples[0]))
else:
    val_user_item_label_tuples_dict = None
    
tst_user_item_label_tuples = tst_user_item_label_df.groupby('user_id').apply(make_tuple_func).reset_index()
tst_user_item_label_tuples_dict = dict(zip(tst_user_item_label_tuples['user_id'], tst_user_item_label_tuples[0]))

运行结果及报错内容

KeyError                                  Traceback (most recent call last)
~/anaconda3/envs/zkl/lib/python3.7/site-packages/pandas/core/indexes/base.py in get_loc(self, key, method, tolerance)
   3079             try:
-> 3080                 return self._engine.get_loc(casted_key)
   3081             except KeyError as err:

pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc()

pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc()

pandas/_libs/hashtable_class_helper.pxi in pandas._libs.hashtable.PyObjectHashTable.get_item()

pandas/_libs/hashtable_class_helper.pxi in pandas._libs.hashtable.PyObjectHashTable.get_item()

KeyError: 0

The above exception was the direct cause of the following exception:

KeyError                                  Traceback (most recent call last)
/tmp/ipykernel_32117/567686863.py in <module>
      9 
     10 tst_user_item_label_tuples = tst_user_item_label_df.groupby('user_id').apply(make_tuple_func).reset_index()
---> 11 tst_user_item_label_tuples_dict = dict(zip(tst_user_item_label_tuples['user_id'], tst_user_item_label_tuples[0]))

~/anaconda3/envs/zkl/lib/python3.7/site-packages/pandas/core/frame.py in __getitem__(self, key)
   3022             if self.columns.nlevels > 1:
   3023                 return self._getitem_multilevel(key)
-> 3024             indexer = self.columns.get_loc(key)
   3025             if is_integer(indexer):
   3026                 indexer = [indexer]

~/anaconda3/envs/zkl/lib/python3.7/site-packages/pandas/core/indexes/base.py in get_loc(self, key, method, tolerance)
   3080                 return self._engine.get_loc(casted_key)
   3081             except KeyError as err:
-> 3082                 raise KeyError(key) from err
   3083 
   3084         if tolerance is not None:

KeyError: 0

我的解答思路和尝试过的方法

我查到这个是无索引的问题，需要重新连接索引，但是我不会，请问具体怎么操作呢？