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Python-线性回归

  • 2026-06-29 11:05:59
Python-线性回归
“回归”的问题，
是通过学习输入特征和目标值之间的线性关系，来预测一个连续的输出。
线性回归的通用数据表达式：
以前读书时经常学到的是y=kx+b，k是斜率，b是截距。原理是相同的，将这种只有一种未知数的称为“一元线性回归”，
当未知数X个数大于1时，称为“多元线性回归”。
若未知数的次数大于1，如x²，x³，称这样的回归方程为“多项式回归”。
建立模型的过程，就是找到变量X前最适合的一组参数w，根据输出的结果进行调整。
逻辑回归，本质上和线性回归是一样的，只是通过数学函数的变换，把数值范围空值在0-1之间。逻辑回归是用来处理分类问题的。而不是预测连续的数值。从名称上看会有所区别。
在引用python的Scikit-learn模块时，会发现逻辑回归也是从skelarn.linear_model 里引用出来的。它们都属于线性模型。
除了线性模型，还有树模型、概率模型、神经网络模型（这个属于深度学习类用的，常用于图像识别、语音识别和自然语言处理）。
Good luck，Excel里也是可以实现预测功能的。
Day 6
#回归模型，#Python学习，#机器学习
天黑了就睡觉，不执着于讲一个完美的故事，一天天好好过。
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  1. CONNECT:[ UseTime:0.000749s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000807s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.100739s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.020778s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000802s ]
  6. SELECT * FROM `set` [ RunTime:0.014634s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000707s ]
  8. SELECT * FROM `article` WHERE `id` = 490704 LIMIT 1 [ RunTime:0.032591s ]
  9. UPDATE `article` SET `lasttime` = 1783067741 WHERE `id` = 490704 [ RunTime:0.014011s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.012594s ]
  11. SELECT * FROM `article` WHERE `id` < 490704 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.018054s ]
  12. SELECT * FROM `article` WHERE `id` > 490704 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.015570s ]
  13. SELECT * FROM `article` WHERE `id` < 490704 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.016661s ]
  14. SELECT * FROM `article` WHERE `id` < 490704 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.016525s ]
  15. SELECT * FROM `article` WHERE `id` < 490704 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008581s ]
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