1、Logistic Regresion calculate ∂L∂zi∂L∂zi =∂(−∑kyklogak)∂zi∂(−∑kyklogak)∂zi 2、DNN Back Propagation 3、Convolution Back Propagation 3、other architecture ResNet,1x1 conv,Inception,Transfer learning,Data argumentation Object detection,Bounding box prediction,NMS,Anchor boxes