Coursera, Machine Learning, Neural Networks: Representation - week4/5
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
![](https://images2018.cnblogs.com/blog/1336977/201804/1336977-20180406222100277-2121248558.png)
![](https://images2018.cnblogs.com/blog/1336977/201804/1336977-20180406222237215-506319837.png)
Gradient Checking
- we can use Gradient checking to check if the backpropagation algorithm is working correctly.
- need randomly initialize theta
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