斯坦福机器学习实验之3-多分类和神经网络(Multi-class Classification and Neural Networks)
2017-05-23 17:14
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1.多分类(Multi-class Classification)
利用逻辑回归和神经网络识别手写的数字。1.1数据集(Dataset)
函数：randperm
1.2数据可视化(Visualizing the data)
1.3逻辑回归矢量化(Vectorizing Logistic Regression)
1.3.1代价函数矢量化(Vectorizing the cost function)
目标：写出矢量版本的代价函数
文件：lrCostFunction.m
1.3.2梯度矢量化(Vectorizing the gradient)
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