caffe是很优秀的dl平台。影响了后面很多相关框架。
cxxnet借鉴了很多caffe的思想。相比之下，cxxnet在实现上更加干净，例如依赖很少，通过mshadow的模板化使得gpu和cpu代码只用写一份，分布式接口也很干净。
mxnet是cxxnet的下一代，目前实现了cxxnet所有功能，但借鉴了minerva/torch7/theano，加入更多新的功能。(Caffe is an excellent DL platform. Affects many related fr a meworks behind.

Cxxnet draws lessons from many caffe ideas. In contrast, cxxnet is cleaner in implementation, such as less dependency. The template of mshadow makes the GPU and CPU code write only one copy, and the distributed interface is also clean.)