Neural Network

Motivations

想要拟合一条曲线，在feature 很多的情况下，feature的组合也很多，在现实中不适用，比如在computer vision问题中feature就太多了.

　　

　　

Applications

　　

　　

cost function and BP

 　　

           

 
　　

　　

　　

　　

　　

Gradient Checking

　　

　　

 
  1. we can use Gradient checking to check if the backpropagation algorithm is working correctly.
  2. need randomly initialize theta

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