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我蹭了3年免费AI,终于搞懂Transformer是啥,1张...

我蹭了3年免费AI,终于搞懂Transformer是啥,1张...

你们有没有这种经历:刷到一篇讲Transformer的文章,开头就是“基于自注意力机制的编码器-解码器架构”,你连第一句话都没读完就划走了。

我干过这事,不下50次。

直到上周,我花了3天时间,把网上能找到的Transformer教程全啃了一遍,又自己动手拆了个开源的代码跑了一遍,才发现这玩意儿根本没那么玄乎。说白了,它就是个“带记性的翻译官”。

今天我就用你肯定见过的东西,把这东西说清楚。

先想个场景。你妈让你去超市买东西,口头交代了一串:“买瓶酱油,要海天的,顺便带包盐,那个上次买的那个牌子的味精也看看有没有,对了再拿一盒鸡蛋。”

你听完脑袋里啥反应?你肯定不是逐字逐句去记“酱油海天顺便盐上次味精鸡蛋”,而是先抓住几个关键词:酱油、盐、味精、鸡蛋。然后你自动给它们排了个序:鸡蛋最后说但最重要,酱油排第二,盐是顺带的。最后你出门时脑子里有个优先级清单。

Transformer干的活,跟这完全一样。

它读一段话的时候,不是按顺序一个字一个字读,而是把整句话里的每个词都跟其他所有词做一次“配对”,看看它们之间到底啥关系。比如它读“那个上次买的那个牌子的味精”,它会自己发现“味精”跟“上次买的”有关系,跟“牌子”有关系,但跟“买瓶酱油”里的“酱油”关系不大。这一步叫“自注意力机制”,土话就是“自己跟自己算亲密值”。

你可能会问,这有啥牛的?以前的AI模型不是也能处理句子吗?

问题就在这。以前的模型,比如RNN和LSTM,它们读句子是排队式的:看完第一个词,记住一点,再看第二个,再记住一点,再看第三个。读到第50个词的时候,第一个词的信息已经忘得差不多了。就像你听领导开会,开了半小时,前面讲的啥早忘了。

Transformer就不一样。它一次性把整句话摆桌上,让每个词都能直接跟其他所有词搭上话。不管这个词在第1位还是第100位,都能互相看一眼。这就像你开视频会议,所有人都能同时看到所有人的脸,而不是只能跟旁边的人咬耳朵。

我去年用GPT-4翻译过一份30页的技术文档,里面全是专业术语。它翻完之后,我检查了其中一段,发现它把“kernel”翻译成了“内核”而不是“核”,把“memory leak”翻译成了“内存泄漏”而不是“内存泄露”。为啥它能选对?就是因为它把“kernel”这个词跟上下文的“操作系统”“调度”这些词做了关联,发现这说的是计算机内核,不是瓜子仁。

Transformer的架构图上,左边是编码器,右边是解码器。编码器负责“听懂”,解码器负责“说出来”。中间还有一堆“注意力头”,每个头负责抓一种关系,就像你同时用眼睛看颜色、用耳朵听声音、用手摸纹理,三个感官一起判断一个东西是不是熟了。

我刚开始看架构图的时候,差点劝退。后来我找了个可视化工具,把一段话丢进去,看它怎么算注意力权重的。结果发现,它居然会给“吃”和“苹果”这两个词打高分,给“吃”和“桌子”打低分。这不就是常识吗?人不会去吃桌子。

还有个细节特有意思。Transformer在训练的时候,会随机遮住句子里的某些词,让它猜被遮住的是啥。比如“我今天中午吃了[遮住]”,它得猜是“饭”“面”还是“汉堡”。猜对了奖励,猜错了扣分。这种“填空训练”重复几亿次之后,它就学会了语言规律。

我自己试过用一个小型的Transformer模型做文本生成,参数只有1.2亿个,比现在的GPT-4小几百倍。结果它生成的句子,虽然偶尔会跑偏,比如“我昨天去公园散步,然后突然变成了一个微波炉”,但语法上居然没啥大毛病。这说明即使模型参数少,只要架构对,也能学会基本的语言结构。

现在你打开任何一个大模型,从ChatGPT到Claude到Llama,底层全是Transformer。它2017年才被Google提出来,到现在不到8年,已经干翻了所有传统模型。你手机里的输入法、翻译软件、语音助手,背后的功臣都是它。

下次再看到“Transformer”这个词,你就想:这是个超级翻译官,它能同时看所有字,自己琢磨谁跟谁有关系,然后按重要性排序,最后生成一个靠谱的回答。

你要是真想亲眼看看它怎么工作的,去搜“Transformer playground”,有个网页版工具,往里打一句话,就能看到每个词跟其他词连了多少根线。我第一次看到那密密麻麻的连线图,像极了我妈在家族群里@所有人的样子。

好了,我去煮面了。吃完这碗面,我打算把那个小模型的参数翻一倍,看看它能不能不把“散步”和“微波炉”扯一块儿去。


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  1. CONNECT:[ UseTime:0.000868s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001132s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000478s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.025620s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001151s ]
  6. SELECT * FROM `set` [ RunTime:0.000362s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000646s ]
  8. SELECT * FROM `article` WHERE `id` = 753728 LIMIT 1 [ RunTime:0.002860s ]
  9. UPDATE `article` SET `lasttime` = 1781622881 WHERE `id` = 753728 [ RunTime:0.004340s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000297s ]
  11. SELECT * FROM `article` WHERE `id` < 753728 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000583s ]
  12. SELECT * FROM `article` WHERE `id` > 753728 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000406s ]
  13. SELECT * FROM `article` WHERE `id` < 753728 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000828s ]
  14. SELECT * FROM `article` WHERE `id` < 753728 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000722s ]
  15. SELECT * FROM `article` WHERE `id` < 753728 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000867s ]
0.148010s