pva-faster-rcnn编译cpu版本的错误

pva-faster-rcnn在ubuntu下编译cpu版本，在编译caffe的时候，遇到如下问题：

src/caffe/layers/proposal_layer.cpp:321:10: error: redefinition of ‘void caffe::ProposalLayer<Dtype>::Backward_gpu(const std::vector<caffe::Blob<Dtype>*>&, const std::vector<bool>&, const std::vector<caffe::Blob<Dtype>*>&)’
STUB_GPU(ProposalLayer);
^
./include/caffe/util/device_alternate.hpp:17:6: note: in definition of macro ‘STUB_GPU’
void classname<Dtype>::Backward_gpu(const vector<Blob<Dtype>*>& top, 
^
In file included from src/caffe/layers/proposal_layer.cpp:1:0:
./include/caffe/fast_rcnn_layers.hpp:122:16: note: ‘virtual void caffe::ProposalLayer<Dtype>::Backward_gpu(const std::vector<caffe::Blob<Dtype>*>&, const std::vector<bool>&, const std::vector<caffe::Blob<Dtype>*>&)’ previously declared here
virtual void Backward_gpu(const vector<Blob<Dtype>*>& top,
^
Makefile:575: recipe for target '.build_release/src/caffe/layers/proposal_layer.o' failed
make: *** [.build_release/src/caffe/layers/proposal_layer.o] Error 1
make: *** Waiting for unfinished jobs....
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问题原因： 
由于caffe::ProposalLayer<Dtype>::Backward_gpu在./include/caffe/fast_rcnn_layers.hpp和./include/caffe/util/device_alternate.hpp（后者为模板形式）中定义了两次，被系统认为重定义。 

解决方法： 
将./include/caffe/fast_rcnn_layers.hpp的Backward_gpu代码

 virtual void Backward_gpu(const vector<Blob<Dtype>*>& top,
const vector<bool>& propagate_down, const vector<Blob<Dtype>*>& bottom){}
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修改如下

 virtual void Backward_gpu(const vector<Blob<Dtype>*>& top,
const vector<bool>& propagate_down, const vector<Blob<Dtype>*>& bottom);
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由于Backward_cpu只在./include/caffe/fast_rcnn_layers.hpp中定义过一次，所以一定避免对它做如上gpu的修改。

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