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AI为何总“漏看”中间?真正原因原来和人类一样

AI为何总“漏看”中间?真正原因原来和人类一样

我是老九,一个一直在一线折腾技术和AI的人。我习惯留意一些看着很先进,但放到工作和生活里付出不小代价的事。欢迎关注我!

当前章节:第一章|Token与分词机制

当前小节:第四节|Token 为什么会影响模型行为(Prompt 与上下文层)

本篇知识点:lost in the middle

我以前用大模型的时候遇到一个奇怪的现象:发了一大段内容,开头模型记住了,结尾模型也记住了,偏偏最重要的信息放在中间,它忘了。

比如:

要求A 

...... 

要求B(最重要) 

...... 

要求C

结果回答里:

A 执行了。

C 执行了。

B 没了。

我还怀疑模型是不是偷懒?其实不是。

理论上Transformer可以看到整个上下文。

开头,

中间,

结尾,

全部都在窗口里。但能看到不等于会重点关注,这就是特别有名的研究现象,名字就叫:Lost in the Middle中间遗失。

我看过一篇文章,研究人员做过实验。把同一个答案分别放在:开头,中间,结尾。

测试模型能不能找到,结果发现开头命中率高,结尾命中率高,中间最低,形成一个很明显的U型曲线。换句话说模型最容易忽略的就是中间那部分。

为什么会这样?我说一个场景可能会容易解释这个现象。

你在看一本书,第一页写着:考试重点

你会记住。

最后一页写着:考试重点

你也容易记住。

但如果放在:第127页中间某一段。

很多人看完就忘。

模型也类似,因为注意力资源不是无限的,虽然Transformer理论上能看全部token,但Attention分配是有倾向的,很多头会天然关注:当前位置附近。

或者:序列两端。

于是中间区域经常成为竞争最激烈的地方。

还有一个问题:上下文越长,问题越明显。

例如:100个token可能影响不大。

但:10万token,20万token,甚至百万token。

中间内容被稀释得越来越厉害,因为每个token都在争夺注意力。注意力预算有限,很多信息还没来得及建立强连接就被后面的内容覆盖了。

这里有个特别有意思的现象,以前我做RAG时会发现知识库命中了,但模型没用,排查发现检索结果被塞进了上下文正中间。模型看到了但没重点关注,于是回答时直接跳过。后来很多RAG框架开始优化:信息摆放位置。

例如:重要内容放前面或者放最后面,不是放中间。因为位置本身就在影响引用概率。

还有一个特别明显的例子,长Prompt。

例如:

角色设定 

...... 

背景资料 

...... 

重要要求 

...... 

输出格式

很多人把最重要要求塞在中间,结果模型老忘。后来改成开头说一次,结尾再说一次,效果明显提升,原因就在这里。

再多说一句,这篇和以前说的Recency Bias不一样。Recency Bias讲的是最后内容影响更大,Lost in the Middle讲的是中间内容影响更小。

一个是加强。

一个是削弱。

共同构成了长上下文里的注意力分布。

很多时候不是模型没看见,也不是模型故意忽略。而是在一条很长很长的token河流里,中间那部分最容易被淹没。

如果你读着还行,欢迎点赞收藏关注;如果有不同的观点,也欢迎大家留言讨论。

基本 文件 流程 错误 SQL 调试
  1. 请求信息 : 2026-06-16 23:03:22 HTTP/1.1 GET : https://www.yeyulingfeng.com/a/754631.html
  2. 运行时间 : 0.113584s [ 吞吐率:8.80req/s ] 内存消耗:4,898.29kb 文件加载:145
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=1d959505f632050c232384463124394e
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  1. CONNECT:[ UseTime:0.000693s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000868s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000344s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000307s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000493s ]
  6. SELECT * FROM `set` [ RunTime:0.000229s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000697s ]
  8. SELECT * FROM `article` WHERE `id` = 754631 LIMIT 1 [ RunTime:0.001149s ]
  9. UPDATE `article` SET `lasttime` = 1781622202 WHERE `id` = 754631 [ RunTime:0.010225s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000275s ]
  11. SELECT * FROM `article` WHERE `id` < 754631 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000554s ]
  12. SELECT * FROM `article` WHERE `id` > 754631 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005544s ]
  13. SELECT * FROM `article` WHERE `id` < 754631 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001018s ]
  14. SELECT * FROM `article` WHERE `id` < 754631 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004464s ]
  15. SELECT * FROM `article` WHERE `id` < 754631 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002076s ]
0.115281s