Week4:Neural Networks难点记录
为什么θ的维度是Sj+1*(Sj+1)?
课堂PPT没有两层单元个数不同的状态，故举一个例子就知道了
Example: If layer 1 has 2 input nodes and layer 2 has 4 activation nodes. Dimension of Θ(1) is going to be 4×3 where sj=2 and sj+1=4, so sj+1×(sj+1)=4×3.
编程作业: Multi-class Classification and Neural Networks难点记录
1.displayData函数工作原理
2.fmincg的工作原理
