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用Excel手搓神经网络3:反向传播算法(上)

  • 2026-11-10 04:14:54
用Excel手搓神经网络3:反向传播算法(上)
用Excel手搓神经网络1：从输入到输出，看懂前向传播计算过程
用Excel手搓神经网络2：从Small到Large，增长的是参数，不变的是逻辑
终于有朋友留言催更了，这是最大的鼓励和支持。希望同行转发、关注。今天讲讲反向传播算法，其实是现学现卖，也借着这套教程，补充下自己知识的漏洞。
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Excel Ctrl+; 快捷键:一秒输对当天日期,告别手动敲错

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  1. 请求信息 : 2026-11-13 09:18:22 HTTP/1.1 GET : http://h.sjds.net/a/479401.html
  2. 运行时间 : 0.077018s [ 吞吐率：12.98req/s ] 内存消耗：4,356.92kb 文件加载：140
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=6ddfea39081867f9c1ed7dbf21f8d296
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  1. CONNECT:[ UseTime:0.000610s ] mysql:host=172.18.0.4;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000861s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000415s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000321s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000574s ]
  6. SELECT * FROM `set` [ RunTime:0.000272s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000707s ]
  8. SELECT * FROM `article` WHERE `id` = 479401 LIMIT 1 [ RunTime:0.000359s ]
  9. UPDATE `article` SET `lasttime` = 1794532702 WHERE `id` = 479401 [ RunTime:0.001399s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000348s ]
  11. SELECT * FROM `article` WHERE `id` < 479401 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000435s ]
  12. SELECT * FROM `article` WHERE `id` > 479401 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000403s ]
  13. SELECT * FROM `article` WHERE `id` < 479401 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000617s ]
  14. SELECT * FROM `article` WHERE `id` < 479401 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000603s ]
  15. SELECT * FROM `article` WHERE `id` < 479401 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000573s ]
0.090962s