Logistic regression

　　

Cost function for logistic regression

　　

Gradient Descent

　　

　　

　　

　　

　　

接下来主要讲 Vectorization

　　

Logistic Regression 的向量实现　　

　　

Vectorizing LR Gradient output

　　

Python/Numpy and Jupyter Notebook

　　

　　

上图中 axis=0 表示竖直方向，axis=1 是水平方向

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