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9_逻辑回归(Logistic Regression)
2022-07-26 22:37:00 【Acowardintheworld】
9_逻辑回归(Logistic Regression)
据统计,逻辑回归是机器学习领域最常用的分类算法,没有之一!在这一章,我们将逐渐揭开逻辑回归的神秘面纱,
了解如何应用线性回归的思路,来解决分类问题。我们将综合之前所学习的很多内容,一点一点来完善我们的逻辑回归模型。
我们还将继续深入分类问题,学习对分类结果概率的估计,以及决策边界等重要概念。 …
9-1 什么是逻辑回归

16,17年的统计数据表明Logistic Regression的普适性。





9-2 逻辑回归的损失函数





9-3 逻辑回归损失函数的梯度












9-4 实现逻辑回归算法

9-5 决策边界




9-6 在逻辑回归中使用多项式特征


9-7 scikit-learn中的逻辑回归

9-8 OvR与OvO






总结
其实这种决策边界的图还是挺高级,可视化的效果也挺直观的,但是没有想到合适的数据集,好像只能在图像中选取特征点再进行逻辑回归。后续 先用稍微大点的数据集进行调参熟悉算法吧。
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