Why is the different between gpu and cpu?

[chengshuai]

I test the code and find the result is differnet between gpu and cpu? Could you tell me the reason?

[Zhaixuejun]

@chengshuai
您好！非常感谢您的分享，我在开始编译源码的时候出现以下错误：
CXX/LD -o .build_debug/tools/compute_image_mean.bin
.build_debug/lib/libcaffe.so: undefined reference to caffe::RegionLayer<double>::Forward_gpu(std::vector<caffe::Blob<double>*, std::allocator<caffe::Blob<double>*> > const&, std::vector<caffe::Blob<double>*, std::allocator<caffe::Blob<double>*> > const&)' .build_debug/lib/libcaffe.so: undefined reference to caffe::ReorgLayer::Backward_gpu(std::vector<caffe::Blob, std::allocator<caffe::Blob> > const&, std::vector<bool, std::allocator > const&, std::vector<caffe::Blob, std::allocator<caffe::Blob> > const&)'
.build_debug/lib/libcaffe.so: undefined reference to caffe::ReorgLayer<double>::Forward_gpu(std::vector<caffe::Blob<double>*, std::allocator<caffe::Blob<double>*> > const&, std::vector<caffe::Blob<double>*, std::allocator<caffe::Blob<double>*> > const&)' .build_debug/lib/libcaffe.so: undefined reference to caffe::RegionLayer::Backward_gpu(std::vector<caffe::Blob, std::allocator<caffe::Blob> > const&, std::vector<bool, std::allocator > const&, std::vector<caffe::Blob, std::allocator<caffe::Blob> > const&)'
.build_debug/lib/libcaffe.so: undefined reference to caffe::RegionLayer<float>::Forward_gpu(std::vector<caffe::Blob<float>*, std::allocator<caffe::Blob<float>*> > const&, std::vector<caffe::Blob<float>*, std::allocator<caffe::Blob<float>*> > const&)' .build_debug/lib/libcaffe.so: undefined reference to caffe::RegionLayer::Backward_gpu(std::vector<caffe::Blob, std::allocator<caffe::Blob> > const&, std::vector<bool, std::allocator > const&, std::vector<caffe::Blob, std::allocator<caffe::Blob> > const&)'
.build_debug/lib/libcaffe.so: undefined reference to caffe::ReorgLayer<float>::Forward_gpu(std::vector<caffe::Blob<float>*, std::allocator<caffe::Blob<float>*> > const&, std::vector<caffe::Blob<float>*, std::allocator<caffe::Blob<float>*> > const&)' .build_debug/lib/libcaffe.so: undefined reference to caffe::ReorgLayer::Backward_gpu(std::vector<caffe::Blob, std::allocator<caffe::Blob> > const&, std::vector<bool, std::allocator > const&, std::vector<caffe::Blob, std::allocator<caffe::Blob> > const&)'
collect2: error: ld returned 1 exit status
make: *** [.build_debug/tools/compute_image_mean.bin] Error 1
仔细看了一下，在添加的region层中确实未实现基于gpu的代码，但我在makefileConfig文件中已经把#CPU_ONLY := 1
改为了CPU_ONLY := 1
还是存在以上问题，请问是什么原因，应该如何解决？