一：转换环境准备
python版本为Python 3.8.0，需要安装对应的版本包，torch==1.10.0 torchvision==0.11.0 torchaudio==0.10.0
pip3 install torch==1.10.0 torchvision==0.11.0 torchaudio==0.10.0 -f https://download.pytorch.org/whl/torch_stable.html
二：下载编译nccn_yolov5需要用到的库
sudo apt install build-essential git cmake libprotobuf-dev protobuf-compiler libvulkan-dev vulkan-utils libopencv-dev
1、下载源码nccn：
git clone https://github.com/Tencent/ncnn.git
cd ncnn
git submodule update --init
2、编译ncnn_yolov5源码: https://github.com/Tencent/ncnn/wiki/how-to-build#build-for-linux
cd ncnn;mkdir build;cd build;cmake ..
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下载yolov5仓库，git clone https://github.com/ultralytics/yolov5
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pt转onnx
python3 export.py --weights ../ywjc_V2023101201.pt --include torchscript onnx
3.在线查看onnx：Netron
输出name有353和367
4、进入到ncnn目录下执行以下命令
./build/tools/onnx/onnx2ncnn ../ywjc_V2023101201.onnx ./yolov5n-fp32-ywjc.param ./yolov5n-fp32-ywjc.bin
./build/tools/ncnnoptimize ./yolov5n-fp32-ywjc.param ./yolov5n-fp32-ywjc.bin ./yolov5n-fp16-ywjc.param ./yolov5n-fp16-ywjc.bin 65536
./build/tools/quantize/ncnn2table ./yolov5n-fp16-ywjc.param ./yolov5n-fp16-ywjc.bin imagelist.txt yolov5n-best.table mean=104,117,123 norm=0.017,0.017,0.017 shape=320,320,3 pixel=BGR thread=8 method=kl