lec2 机器学习（basic of convolutional neural network）

deep representations

raw data   特征提取；

data->analysis/statistics->programming

DL is a branch of ML

 

 

每上面一层都是对下面一层的浓缩总结提取

hierarchical organization：

pixels->edges->object parts/conbination of edges--(组合过程)->object models

 

cnn（feature extraction）

cnn：convolution + pooling  + fully connection

convolution：

 

fully connected neural net   vs     convolutional net（压缩很多）？

 

lenet 5（百度）

Y.lecun L。botton Gradient-Based learning applied to document recognition