caffe学习4——net

参考文献

1 The net jointly defines a function and its gradient by composition and auto-differentiation.

2 The net is a set of layers connected in a computation graph – a directed acyclic graph (DAG) to be exact.保证前向后向通路，从硬盘加载数据到返回loss，进而进行分类等任务。

3 The net is defined as a set of layers and their connections in a plaintext modeling language.网是层的集合加上连接。

例子：A simple logistic regression classifier is defined by

 name: "LogReg"
 layer {
   name: "mnist"
   type: "Data"
   top: "data"
   top: "label"
   data_param {
     source: "input_leveldb"
     batch_size:
   }
 }
 layer {
   name: "ip"
   type: "InnerProduct"
   bottom: "data"
   top: "ip"
   inner_product_param {
     num_output:
   }
 }
 layer {
   name: "loss"
   type: "SoftmaxWithLoss"
   bottom: "ip"
   bottom: "label"
   top: "loss"
 }