mxnet环境搭建随记

　　安装mxnet还是遇到不少麻烦事，当然有些事自己“作”的。现在简单记一下，挖个坑，后续详细补充，打算写一下我的mxnet探索之旅。

具体安装mxnet,cuda,opencv,过程，网上很多，现在先不写。比如可参考：用MXnet实战深度学习之一：安装GPU版mxnet并跑一个MNIST手写数字识别

　　我的电脑是三星500r5h，安装ubuntu至今未找到无线网卡驱动。当然这不影响我们mxnet。但是显卡是gt940m就有影响了， 不知道为什么，在cuda7.5+ubuntu14.04amd64 + opencv2.4.13时，会显卡驱动有问题，无法显示桌面.但是可以正常使用。后续我改为16.04+cuda8.0rc+opencv2.4.13,解决了桌面显示问题且正常使用，但是在想把opencv2.4.13换为opencv3.10时，编译opencv3.10时会报错,关于cudalegacy模块，如下;　

/home/ecarx/opencv-3.1.0/modules/cudalegacy/src/graphcuts.cpp:120:54: error: ‘NppiGraphcutState’ has not been declared
     typedef NppStatus (*init_func_t)(NppiSize oSize, NppiGraphcutState** ppStat
                                                      ^
/home/ecarx/opencv-3.1.0/modules/cudalegacy/src/graphcuts.cpp:135:18: error: ‘NppiGraphcutState’ does not name a type
         operator NppiGraphcutState*()
                  ^
/home/ecarx/opencv-3.1.0/modules/cudalegacy/src/graphcuts.cpp:141:9: error: ‘NppiGraphcutState’ does not name a type
         NppiGraphcutState* pState;
         ^
In file included from /home/ecarx/opencv-3.1.0/build/modules/cudalegacy/precomp.hpp:75:0:
/home/ecarx/opencv-3.1.0/modules/cudalegacy/src/graphcuts.cpp: In constructor ‘{anonymous}::NppiGraphcutStateHandler::NppiGraphcutStateHandler(NppiSize, Npp8u*, {anonymous}::init_func_t)’:
/home/ecarx/opencv-3.1.0/modules/cudalegacy/src/graphcuts.cpp:127:39: error: ‘pState’ was not declared in this scope
             nppSafeCall( func(sznpp, &pState, pDeviceMem) );
                                       ^
/home/ecarx/opencv-3.1.0/modules/core/include/opencv2/core/private.cuda.hpp:165:52: note: in definition of macro ‘nppSafeCall’
 #define nppSafeCall(expr)  cv::cuda::checkNppError(expr, __FILE__, __LINE__, CV
                                                    ^
/home/ecarx/opencv-3.1.0/modules/cudalegacy/src/graphcuts.cpp: In destructor ‘{anonymous}::NppiGraphcutStateHandler::~NppiGraphcutStateHandler()’:
/home/ecarx/opencv-3.1.0/modules/cudalegacy/src/graphcuts.cpp:132:43: error: ‘pState’ was not declared in this scope
             nppSafeCall( nppiGraphcutFree(pState) );
                                           ^
/home/ecarx/opencv-3.1.0/modules/core/include/opencv2/core/private.cuda.hpp:165:52: note: in definition of macro ‘nppSafeCall’
 #define nppSafeCall(expr)  cv::cuda::checkNppError(expr, __FILE__, __LINE__, CV
                                                    ^
/home/ecarx/opencv-3.1.0/modules/cudalegacy/src/graphcuts.cpp:132:49: error: ‘nppiGraphcutFree’ was not declared in this scope
             nppSafeCall( nppiGraphcutFree(pState) );
                                                 ^
/home/ecarx/opencv-3.1.0/modules/core/include/opencv2/core/private.cuda.hpp:165:52: note: in definition of macro ‘nppSafeCall’
 #define nppSafeCall(expr)  cv::cuda::checkNppError(expr, __FILE__, __LINE__, CV
                                                    ^
/home/ecarx/opencv-3.1.0/modules/cudalegacy/src/graphcuts.cpp: In function ‘void cv::cuda::graphcut(cv::cuda::GpuMat&, cv::cuda::GpuMat&, cv::cuda::GpuMat&, cv::cuda::GpuMat&, cv::cuda::GpuMat&, cv::cuda::GpuMat&, cv::cuda::GpuMat&, cv::cuda::Stream&)’:
/home/ecarx/opencv-3.1.0/modules/cudalegacy/src/graphcuts.cpp:174:51: error: ‘nppiGraphcutGetSize’ was not declared in this scope
     nppSafeCall( nppiGraphcutGetSize(sznpp, &bufsz) );
                                                   ^
/home/ecarx/opencv-3.1.0/modules/core/include/opencv2/core/private.cuda.hpp:165:52: note: in definition of macro ‘nppSafeCall’
 #define nppSafeCall(expr)  cv::cuda::checkNppError(expr, __FILE__, __LINE__, CV
                                                    ^
/home/ecarx/opencv-3.1.0/modules/cudalegacy/src/graphcuts.cpp:182:61: error: ‘nppiGraphcutInitAlloc’ was not declared in this scope
     NppiGraphcutStateHandler state(sznpp, buf.ptr<Npp8u>(), nppiGraphcutInitAll
                                                             ^
In file included from /home/ecarx/opencv-3.1.0/build/modules/cudalegacy/precomp.hpp:75:0:
/home/ecarx/opencv-3.1.0/modules/cudalegacy/src/graphcuts.cpp:191:146: error: ‘nppiGraphcut_32s8u’ was not declared in this scope
 nsp.step), sznpp, labels.ptr<Npp8u>(), static_cast<int>(labels.step), state) );
                                                                            ^
/home/ecarx/opencv-3.1.0/modules/core/include/opencv2/core/private.cuda.hpp:165:52: note: in definition of macro ‘nppSafeCall’
 #define nppSafeCall(expr)  cv::cuda::checkNppError(expr, __FILE__, __LINE__, CV
                                                    ^
/home/ecarx/opencv-3.1.0/modules/cudalegacy/src/graphcuts.cpp:196:146: error: ‘nppiGraphcut_32f8u’ was not declared in this scope
 nsp.step), sznpp, labels.ptr<Npp8u>(), static_cast<int>(labels.step), state) );
                                                                            ^
/home/ecarx/opencv-3.1.0/modules/core/include/opencv2/core/private.cuda.hpp:165:52: note: in definition of macro ‘nppSafeCall’
 #define nppSafeCall(expr)  cv::cuda::checkNppError(expr, __FILE__, __LINE__, CV
                                                    ^
/home/ecarx/opencv-3.1.0/modules/cudalegacy/src/graphcuts.cpp: In function ‘void cv::cuda::graphcut(cv::cuda::GpuMat&, cv::cuda::GpuMat&, cv::cuda::GpuMat&, cv::cuda::GpuMat&, cv::cuda::GpuMat&, cv::cuda::GpuMat&, cv::cuda::GpuMat&, cv::cuda::GpuMat&, cv::cuda::GpuMat&, cv::cuda::GpuMat&, cv::cuda::GpuMat&, cv::cuda::Stream&)’:
/home/ecarx/opencv-3.1.0/modules/cudalegacy/src/graphcuts.cpp:246:52: error: ‘nppiGraphcut8GetSize’ was not declared in this scope
     nppSafeCall( nppiGraphcut8GetSize(sznpp, &bufsz) );
                                                    ^
/home/ecarx/opencv-3.1.0/modules/core/include/opencv2/core/private.cuda.hpp:165:52: note: in definition of macro ‘nppSafeCall’
 #define nppSafeCall(expr)  cv::cuda::checkNppError(expr, __FILE__, __LINE__, CV
                                                    ^
/home/ecarx/opencv-3.1.0/modules/cudalegacy/src/graphcuts.cpp:254:61: error: ‘nppiGraphcut8InitAlloc’ was not declared in this scope
     NppiGraphcutStateHandler state(sznpp, buf.ptr<Npp8u>(), nppiGraphcut8InitAl
                                                             ^
In file included from /home/ecarx/opencv-3.1.0/build/modules/cudalegacy/precomp.hpp:75:0:
/home/ecarx/opencv-3.1.0/modules/cudalegacy/src/graphcuts.cpp:267:146: error: ‘nppiGraphcut8_32s8u’ was not declared in this scope
 nsp.step), sznpp, labels.ptr<Npp8u>(), static_cast<int>(labels.step), state) );
                                                                            ^
/home/ecarx/opencv-3.1.0/modules/core/include/opencv2/core/private.cuda.hpp:165:52: note: in definition of macro ‘nppSafeCall’
 #define nppSafeCall(expr)  cv::cuda::checkNppError(expr, __FILE__, __LINE__, CV
                                                    ^
/home/ecarx/opencv-3.1.0/modules/cudalegacy/src/graphcuts.cpp:274:146: error: ‘nppiGraphcut8_32f8u’ was not declared in this scope
 nsp.step), sznpp, labels.ptr<Npp8u>(), static_cast<int>(labels.step), state) );
                                                                            ^
/home/ecarx/opencv-3.1.0/modules/core/include/opencv2/core/private.cuda.hpp:165:52: note: in definition of macro ‘nppSafeCall’
 #define nppSafeCall(expr)  cv::cuda::checkNppError(expr, __FILE__, __LINE__, CV
                                                    ^
modules/cudalegacy/CMakeFiles/opencv_cudalegacy.dir/build.make:290: recipe for target ‘modules/cudalegacy/CMakeFiles/opencv_cudalegacy.dir/src/graphcuts.cpp.o‘ failed
make[2]: *** [modules/cudalegacy/CMakeFiles/opencv_cudalegacy.dir/src/graphcuts.cpp.o] Error 1
make[2]: *** 正在等待未完成的任务....
[ 73%] Linking CXX executable ../../bin/opencv_perf_photo
CMakeFiles/Makefile2:9117: recipe for target ‘modules/cudalegacy/CMakeFiles/opencv_cudalegacy.dir/all‘ failed
make[1]: *** [modules/cudalegacy/CMakeFiles/opencv_cudalegacy.dir/all] Error 2
make[1]: *** 正在等待未完成的任务....
[ 73%] Built target opencv_perf_photo
Makefile:160: recipe for target ‘all‘ failed
make: *** [all] Error 2

编译opencv3.10报错

　　经多次尝试（比如修改cmake选项）以及“玄学”尝试（瞎改选项），都不成功。暂时放弃使用，初步猜测是因为，opencv3.10是2015年年末发行的，cuda8.0rc是2016.05发行的,所以本身opencv3.10不支持cuda8.0rc，但是我还没有去github问(opencv2.4.13是2016.05发行，使用正常)。（另：cuda7.5不支持ubunt16.04 但是cuda8.0支持ubuntu14.04，也可以换个系统环境试一下，没能力分析根本原因还想解决问题时，只能靠实践了）。后续还会再尝试，到时再更新。

　　我个人是因为硬件问题，所以环境选ubuntu16.04+cuda8.0rc。如果没这个限制最好选择比最新版本低一个版本，以求稳定。

　　不得不说，搭建环境很耗时间，环境稳定后，不要轻易改变。