4.切换系统python版本
sudo update-alternatives --config python
5.切换系统gcc版本
sudo update-alternatives --config gcc
ubuntu16.04中的gcc版本及版本切换文章来源：https://www.toymoban.com/news/detail-848639.html
5.查看opencv版本
pkg-config opencv --modversion
查看cuda版本
cat /usr/local/cuda/version.txt
或者文章来源地址https://www.toymoban.com/news/detail-848639.html
nvcc -V
查看cudnn版本
cat /usr/local/cuda/include/cudnn.h | grep CUDNN_MAJOR -A 2
查看prototbuf版本
protoc --version
sudo rm -r /usr/local/include/opencv2 /usr/local/include/opencv /usr/include/opencv /usr/include/opencv2 /usr/local/share/opencv /usr/local/share/OpenCV /usr/share/opencv /usr/share/OpenCV /usr/local/bin/opencv* /usr/local/lib/libopencv*
sudo apt-get install cmake libgtk2.0-dev libavcodec-dev libavformat-dev libjpeg-dev libpng-dev libtiff-dev libtiff5-dev libswscale-dev libjasper-dev libcurl4-openssl-dev libtbb2 libdc1394-22-dev libavresample-dev libgphoto2-dev
mkdir build
cd build
cmake -D CMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=/usr/local ..
sudo make -j4
sudo make install
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