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学习笔记:恶补机器学习Day2

  • 2026-02-10 01:20:44
学习笔记:恶补机器学习Day2

1.什么是卷积神经网路（CNN，Convolutional Neural Network））?

转载自小红书——AI赵哥

1.像生物一样看世界，先用基础神经元局部找特征，后抽象，归纳，汇总，高级神经元拼图

1.卷积——特征提取大师（卷积层，引用矩阵，即表达方向，又表达结构）
kernel（卷积核）filter(滤波器）
4.池化，进一步抽象，减少参数，矩阵让抽象得到完美的呈现。

2.特征图是什么？

乘以一个矩阵，得到一个数，遍历所有的矩阵。得到一个抽象后更小矩阵
3.激活卷积层——非线性方程，这个工具，进一步抽象，简化参数
5.未来世界是什么样的？
矩阵，计算可以拟合。
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  1. CONNECT:[ UseTime:0.000492s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000762s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000313s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001712s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000620s ]
  6. SELECT * FROM `set` [ RunTime:0.000216s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000565s ]
  8. SELECT * FROM `article` WHERE `id` = 462775 LIMIT 1 [ RunTime:0.004527s ]
  9. UPDATE `article` SET `lasttime` = 1770698214 WHERE `id` = 462775 [ RunTime:0.002408s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.004408s ]
  11. SELECT * FROM `article` WHERE `id` < 462775 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000612s ]
  12. SELECT * FROM `article` WHERE `id` > 462775 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000493s ]
  13. SELECT * FROM `article` WHERE `id` < 462775 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003612s ]
  14. SELECT * FROM `article` WHERE `id` < 462775 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000958s ]
  15. SELECT * FROM `article` WHERE `id` < 462775 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004107s ]
0.102609s