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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