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Merge branch 'master' of https://github.com/apachecn/MachineLearning

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wenhuanhuan
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# 1) 逻辑回归基础
* 逻辑回归(Logistic Regression)
* 1.1 分类问题
* 1.2 假说表示
* 1.3 判定边界
* 1.4 代价函数
* 1.5 简化的成本函数和梯度下降
* 1.6 高级优化
* 1.7 多类分类：一个对所有