摘要：
A quick overview of neural network of Andrew Ng 图1.简单的概览 \[ 对于[1],我们有\\ \rightarrow z^{[1]}=W^{[1]}x+b^{[1]} \rightarrow a^{[1]}=\sigma(z^{[1]})\\ 对于[ 阅读全文
摘要：
Explanation of logistic regression cost function \[ \begin{array}{c} \hat{y} = \sigma(w^Tx+b)\quad where\;\sigma(z) = \frac{1}{1+e^{-z}}\\ interpret \ 阅读全文