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Python-19-SVM

  • 2026-07-02 16:35:56
Python-19-SVM
SVM的英文全称Support Vector Mahine,中文为支持向量机。可以用来处理离散型变量的分类和连续因变量的预测，是一种有监督的机器学习算法。
其核心是要找到一个满足条件的“分割平面”，实现不同维度空间下对数据的分割。它是一维空间里的一个点，二维空间的一条直线，三维空间里的一个平面。
如果能在对应的维度空间里，找到合适的“平面”，把两组数据完全分开。则称这样的数据线性可分。
以二维空间距离，线性不可分是指找不到一条直线能后讲两组数据区分开来，我们通过一个核函数，将数据映射到三维空间，这是可以找到一个平面完全切割着两组数据，这个平面在二维平面上显示的是一条曲线。先升维，再降维处理。如下是数据线性不可分的示例。
常用的核函数用四种：线性核函数、多项式核函数、高斯核函数、Sigmoid核函数。
当我们的数据线性不可分的时候，除了升维度进行处理，还有一种方法是允许少量的点存在于超平面的错误一侧。使用软间隔，区别于数据线性可分的硬间隔，允许部分样本违反约束。
SVM子模块分类
LinearSVC
SVC
LinearSVR
SVR
任务类型
线性分类
分类
线性聚合
聚合
核函数支持
仅线性
多种
仅线性
多种
选择理由
速度快
非线性处理
速度快
非线性处理
模块引用代码
# 分类器from sklearn.svm import SVC, LinearSVC, NuSVC# 回归器from sklearn.svm import SVR, LinearSVR
--
Day 19
#Python,#SVM,#数据挖掘
我的一天就是一辈子的缩影，所以我今天开心了就是一辈子开心了。
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  138. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/vendor/topthink/think-template/src/template/contract/DriverInterface.php ( 0.86 KB )
  139. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/runtime/temp/067d451b9a0c665040f3f1bdd3293d68.php ( 11.98 KB )
  140. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.000668s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000877s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000305s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000276s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000464s ]
  6. SELECT * FROM `set` [ RunTime:0.000222s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000544s ]
  8. SELECT * FROM `article` WHERE `id` = 495034 LIMIT 1 [ RunTime:0.000379s ]
  9. UPDATE `article` SET `lasttime` = 1783047384 WHERE `id` = 495034 [ RunTime:0.010789s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000251s ]
  11. SELECT * FROM `article` WHERE `id` < 495034 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000535s ]
  12. SELECT * FROM `article` WHERE `id` > 495034 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.007901s ]
  13. SELECT * FROM `article` WHERE `id` < 495034 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000933s ]
  14. SELECT * FROM `article` WHERE `id` < 495034 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001471s ]
  15. SELECT * FROM `article` WHERE `id` < 495034 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.010937s ]
0.106001s