1 问题背景

环境：

Ubuntu20.04 Python3.6

现象：终端输出类似下面的命令    
    
    
，并卡住不动

Building wheel for opencv-python (PEP 517) ...

2 问题探索

首先   


     


     


，OpenCV较旧的Python版本不需要进行滚轮编译



 




 




 ，因此造成编译在

Building wheel for opencv-python (PEP 517)

处停止  
    
    
。为了防止因为pip版本较旧引起干扰   

   

   
，首先运行

pip install --upgrade pip

更新pip版本    

     

     

，接着再次安装

pip install opencv-python -i https://pypi.tuna.tsinghua.edu.cn/simple

接着大概率能解决Building wheel for opencv-python (PEP 517)




  




  




 ，但是遇到新的现象  


  


  
，终端运行到下面指令时卡住

building wheel for opencv(pyproject.toml) ...

我们希望看看后端到底是什么情况     
     
     
，用--verbose运行安装命令跟踪安装过程




   




   




 ，也可以检查安装的百分比

[ 48%] Building CXX object modules/dnn/CMakeFiles/opencv_dnn.dir/src/layers/fast_convolution/fast_convolution.avx2.cpp.o [ 48%] Building CXX object modules/dnn/CMakeFiles/opencv_dnn.dir/layers/layers_common.avx2.cpp.o [ 48%] Building CXX object modules/dnn/CMakeFiles/opencv_dnn.dir/int8layers/layers_common.avx2.cpp.o [ 48%] Building CXX object modules/dnn/CMakeFiles/opencv_dnn.dir/layers/layers_common.avx512_skx.cpp.o [ 48%] Building CXX object modules/dnn/CMakeFiles/opencv_dnn.dir/int8layers/layers_common.avx512_skx.cpp.o [ 48%] Linking CXX static library ../../lib/libopencv_dnn.a [ 48%] Built target opencv_dnn [ 48%] Processing OpenCL kernels (features2d) [ 49%] Building CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/affine_feature.cpp.o [ 49%] Building CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/agast.cpp.o [ 49%] Building CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/agast_score.cpp.o [ 49%] Building CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/akaze.cpp.o [ 49%] Building CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/bagofwords.cpp.o [ 49%] Building CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/blobdetector.cpp.o [ 49%] Building CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/brisk.cpp.o [ 49%] Building CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/draw.cpp.o [ 49%] Building CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/dynamic.cpp.o [ 50%] Building CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/evaluation.cpp.o [ 50%] Building CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/fast.cpp.o [ 50%] Building CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/fast_score.cpp.o [ 50%] Building CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/feature2d.cpp.o [ 50%] Building CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/gftt.cpp.o

发现后端确实一直在运行
 



 



 
，由于OpenCV体积较大               ，编译时间较长 




    




    




 ，导致不显示安装进度的化












，前端出现假死现象               ，静静等待即可

     


     


     。

3 问题解决

更新pip版本

pip install --upgrade pip

显示安装进程

pip install opencv-python -i https://pypi.tuna.tsinghua.edu.cn/simple --verbose

等待安装完成

文章最后  



     



     



 ，推荐一个研究深度学习都会碰到的bug解析

【已解决】探究CUDA out of memory背后原因












，如何释放GPU显存？

4 告别Bug

本文收录于《告别Bug》专栏    
    
    
，该专栏记录人工智能领域中各类Bug以备复查   


     


     


，文章形式为：问题背景 + 问题探索 + 问题解决



 




 




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