ubuntu18安装tensorrt7.2.3+cuda11.1+cudnn8.0+opencv4.4.0+显卡驱动nvidia-driver-465+rtx3080
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显卡驱动nvidia-driver-465、cuda以及cudnn的下载安装
显卡驱动nvidia-driver-465、cuda以及cudnn的下载安装可以看我的这篇博客：
https://blog.csdn.net/weixin_43269994/article/details/109030404
TensorRT-7.2.2.3下载安装
在官网下载TensorRT-7.2.2.3.Ubuntu-18.04.x86_64-gnu.cuda-11.1.cudnn8.0.tar.gz
tar xzvf TensorRT-7.2.2.3.Ubuntu-18.04.x86_64-gnu.cuda-11.1.cudnn8.0.tar.gz
解压后先配置环境变量：
sudo vim ~/.bashrc
进入后，在最底部添加环境变量：
export TRT_PATH=/home/lindsay/TensorRT-7.2.2.3
export PATH=$PATH:$TRT_PATH/bin
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$TRT_PATH/lib
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$TRT_PATH/targets/x86_64-linux-gnu/lib
进入到解压路径下的python文件夹，使用pip安装：
cd TensorRT-7.2.2.3/python
pip3 install tensorrt-7.2.2.3-cp37-none-linux_x86_64.whl
安装uff以支持tensorflow
cd TensorRT-7.2.2.3/uff
pip3 install uff-0.6.9-py2.py3-none-any.whl
安装graphsurgeon以支持自定义结构
cd TensorRT-7.2.2.3/graphsurgeon
pip3 install graphsurgeon-0.4.5-py2.py3-none-any.whl
安装onnx_graphsurgeon以支持onnx
cd TensorRT-7.2.2.3/onnx_grahsurgeon
pip3 install onnx_graphsurgeon-0.2.6-py2.py3-none-any.whl
OpenCV下载安装
下载地址OpenCV官网，选择最新的4.4.0版本(如果下载速度太慢，复制链接地址，使用迅雷)
https://opencv.org/releases/
编译与安装
安装cmake
OpenCV需要使用cmake进行编译
sudo apt-get install cmake
安装依赖
sudo apt-get install build-essential pkg-config libgtk2.0-dev libavcodec-dev libavformat-dev libjpeg-dev libswscale-dev libtiff5-dev
出现以下问题：
The following packages have unmet dependencies:
libavcodec-dev : Depends: libavutil-dev (= 7:3.4.2-2) but it is not going to be installed
Depends: libswresample-dev (= 7:3.4.2-2) but it is not going to be installed
libavformat-dev : Depends: libavformat57 (= 7:3.4.2-2) but it is not going to be installed
Depends: libavutil-dev (= 7:3.4.2-2) but it is not going to be installed
Depends: libswresample-dev (= 7:3.4.2-2) but it is not going to be installed
libgtk2.0-dev : Depends: libglib2.0-dev (>= 2.27.3) but it is not going to be installed
Depends: libgdk-pixbuf2.0-dev (>= 2.21.0) but it is not going to be installed
Depends: libpango1.0-dev (>= 1.20) but it is not going to be installed
Depends: libatk1.0-dev (>= 1.29.2) but it is not going to be installed
Depends: libcairo2-dev (>= 1.6.4-6.1) but it is not going to be installed
Depends: libx11-dev (>= 2:1.0.0-6) but it is not going to be installed
Depends: libxext-dev (>= 1:1.0.1-2) but it is not going to be installed
Depends: libxinerama-dev (>= 1:1.0.1-4.1) but it is not going to be installed
Depends: libxi-dev (>= 1:1.0.1-4) but it is not going to be installed
Depends: libxrandr-dev (>= 2:1.2.99) but it is not going to be installed
Depends: libxcursor-dev but it is not going to be installed
Depends: libxfixes-dev (>= 1:3.0.0-3) but it is not going to be installed
Depends: libxcomposite-dev (>= 1:0.2.0-3) but it is not going to be installed
Depends: libxdamage-dev (>= 1:1.0.1-3) but it is not going to be installed
Recommends: python (>= 2.4) but it is not going to be installed
libjpeg-dev : Depends: libjpeg8-dev but it is not going to be installed
libswscale-dev : Depends: libavutil-dev (= 7:3.4.2-2) but it is not going to be installed
Depends: libswscale4 (= 7:3.4.2-2) but 7:3.4.8-0ubuntu0.2 is to be installed
libtiff5-dev : Depends: libtiff5 (= 4.0.9-5) but 4.0.9-5ubuntu0.4 is to be installed
E: Unable to correct problems, you have held broken packages.
使用aptitude
aptitude与 apt-get 一样，是 Debian 及其衍生系统中功能极其强大的包管理工具。与 apt-get 不同的是，aptitude在处理依赖问题上更佳一些。举例来说，aptitude在删除一个包时，会同时删除本身所依赖的包。这样，系统中不会残留无用的包，整个系统更为干净。
sudo aptitude install install build-essential pkg-config libgtk2.0-dev libavcodec-dev libavformat-dev libjpeg-dev libswscale-dev libtiff5-dev
运行后，不接受未安装方案，接受降级方案。
解压
unzip opencv-4.4.0
进入文件目录，创建build目录并进入
cd opencv-4.4.0/
mkdir build
cd build
使用cmake生成makefile文件
cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D WITH_GTK=ON -D OPENCV_GENERATE_PKGCONFIG=YES ..
CMAKE_BUILD_TYPE=RELEASE：表示编译发布版本
CMAKE_INSTALL_PREFIX：表示生成动态库的安装路径，可以自定义
WITH_GTK=ON：这个配置是为了防止GTK配置失败：即安装了libgtk2.0-dev依赖，还是报错未安装
OPENCV_GENERATE_PKGCONFIG=YES：表示自动生成OpenCV的pkgconfig文件，否则需要自己手动生成。
编译
make -j8
-j8表示使用多个系统内核进行编译，从而提高编译速度，不清楚自己系统内核数的，可以使用make -j$(nproc)
如果编译时报错，可以尝试不使用多个内核编译，虽然需要更长的编译时间，但是可以避免一些奇怪的报错
安装
sudo make install
注：如果需要重新cmake，请先将build目录下的文件清空，再重新cmake，以免发生错误
环境配置
将OpenCV的库添加到系统路径
方法一：配置ld.so.conf文件
sudo vim /etc/ld.so.conf
在文件中加上一行 include /usr/local/lib，这个路径是cmake编译时填的动态库安装路径加上/lib
配置ld.so.conf文件
方法二：手动生成opencv.conf文件
sudo vim /etc/ld.so.conf.d/opencv.conf
是一个新建的空文件，直接添加路径，同理这个路径是cmake编译时填的动态库安装路径加上/lib
/usr/local/lib
以上两种方法配置好后，执行如下命令使得配置的路径生效
sudo ldconfig
配置系统bash
因为在cmake时，选择了自动生成OpenCV的pkgconfig文件，在/usr/local/lib/pkgconfig路径可以看到文件
opencv4.pc
确保文件存在，执行如下命令
sudo vim /etc/bash.bashrc
在文末添加
PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig
export PKG_CONFIG_PATH
如下：
bash.bashrc
保存退出，然后执行如下命令使配置生效
source /etc/bash.bashrc
至此，Linux\Ubuntu18.04环境下OpenCV的安装以及配置已经全部完成，可以使用以下命令查看是否安装和配置成功
pkg-config --modversion opencv4
pkg-config --cflags opencv4
pkg-config --libs opencv4
使用TensorRT
下载yolov5和tensorrtx
git clone https://github.com/wang-xinyu/tensorrtx.git
git clone https://github.com/ultralytics/yolov5.git
将tensorrt/yolov5拷贝至yolov5下：sudo cp -r tenorrtx/yolov5 yolov5
生成pt对应的wts: python gen_wts.py
将wts放至build同级目录
修改CMakeLists.txt：
# tensorrt
#include_directories(/usr/include/x86_64-linux-gnu/)
#link_directories(/usr/lib/x86_64-linux-gnu/)
include_directories(/home/lindsay/TensorRT-7.2.2.3/include)
link_directories(/home/lindsay/TensorRT-7.2.2.3/lib)
修改yololayer.h：
static constexpr int CLASS_NUM = 80;#根据自己的类别修改
开始编译并测试：
mkdir build && cd build
cmake ..
make -j6
sudo ./yolov5 -s ../yolov5s.wts ../yolov5s.engine s# 生成引擎
sudo ./yolov5 -d ../yolov5s.engine ../samples#测试c++
python3 yolov5_trt.py #测试python
一起开启新世界的大门吧