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