machine learning(8) -- classification
- 分类预测不能使用linear regression, linear regression算法对于分类预测效果很差，应使用logistic regression算法
- Logistic regresstion = a Classification algorithm 一种分类预测算法
- Logistic regression model:
- Sigmoid function = Logistic function
- Logistic function的曲线图(y值处于0与1之间【z->+∞时g(z)->1,z->-∞时,g(z)->0】,符合分类算法对于output的要求)
- 对于output(hΘ(x)的结果)的解释:
为y=1的概率.
Logistic regression
当hθ(x)>=0.5时 即 θTx>=0 ，y=1
当hθ(x)<0.5时 即 θTx<0 ， y=0
转载于:https://www.cnblogs.com/yan2015/p/4673330.html
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