系统存在多个opencv库导致的caffe运行异常:undefined symbol imencode imread

妖狐艹你老母 2022-10-01 02:48 42阅读 0赞

今天运行faster rcnn demo的时候居然出错了：

> guyadong@gyd-u16:~/tmp/py-faster-rcnn$ tools/demo.py  
> Traceback (most recent call last):  
> File “tools/demo.py”, line 18, in  
> from fast\_rcnn.test import im\_detect  
> File “/home/guyadong/tmp/py-faster-rcnn/tools/../lib/fast\_rcnn/test.py”, line 16, in  
> import caffe  
> File “/home/guyadong/tmp/py-faster-rcnn/tools/../caffe-fast-rcnn/python/caffe/**init**.py”, line 1, in  
> from .pycaffe import Net, SGDSolver, NesterovSolver, AdaGradSolver, RMSPropSolver, AdaDeltaSolver, AdamSolver, NCCL, Timer  
> File “/home/guyadong/tmp/py-faster-rcnn/tools/../caffe-fast-rcnn/python/caffe/pycaffe.py”, line 13, in  
> from .\_caffe import Net, SGDSolver, NesterovSolver, AdaGradSolver, \\  
> ImportError: /home/guyadong/tmp/py-faster-rcnn/caffe-fast-rcnn/lib/libcaffe.so.1.0.0-rc5: undefined symbol: *ZN2cv8imencodeERKNSt7\_\_cxx1112basic\_stringIcSt11char\_traitsIcESaIcEEERKNS*  
> 11\_InputArrayERSt6vectorIhSaIhEERKSB\_IiSaIiEE  
> guyadong@gyd-u16:~/tmp/py-faster-rcnn$ strings /home/guyadong/tmp/py-faster-rcnn/caffe-fast-rcnn/lib/libcaffe.so.1.0.0-rc5 |grep imencode  
> *ZN2cv8imencodeERKNSt7\_\_cxx1112basic\_stringIcSt11char\_traitsIcESaIcEEERKNS*  
> 11\_InputArrayERSt6vectorIhSaIhEERKSB\_IiSaIiEE  
> *ZN2cv8imencodeERKNSt7\_\_cxx1112basic\_stringIcSt11char\_traitsIcESaIcEEERKNS*  
> 11\_InputArrayERSt6vectorIhSaIhEERKSB\_IiSaIiEE

根据提示信息，应该是找不到imencode这个函数。  
运行caffe的test (make runtest)也同样报错，只是这次是找不到im\_read函数。

> \[———-\] 5 tests from ImageDataLayerTest/2, where TypeParam = caffe::GPUDevice  
> \[ RUN \] ImageDataLayerTest/2.TestResize  
> /home/guyadong/caffe/caffe-master/build/test/test.testbin: symbol lookup error: /home/guyadong/caffe/caffe-master/build/lib/libcaffe.so.1.0.0-rc3: undefined symbol: \_ZN2cv6imreadERKNSt7\_\_cxx1112basic\_stringIcSt11char\_traitsIcESaIcEEEi  
> src/caffe/test/CMakeFiles/runtest.dir/build.make:57: recipe for target ‘src/caffe/test/CMakeFiles/runtest’ failed  
> make\[3\]: *\** \[src/caffe/test/CMakeFiles/runtest\] Error 127  
> CMakeFiles/Makefile2:328: recipe for target ‘src/caffe/test/CMakeFiles/runtest.dir/all’ failed  
> make\[2\]: *\** \[src/caffe/test/CMakeFiles/runtest.dir/all\] Error 2  
> CMakeFiles/Makefile2:335: recipe for target ‘src/caffe/test/CMakeFiles/runtest.dir/rule’ failed  
> make\[1\]: *\** \[src/caffe/test/CMakeFiles/runtest.dir/rule\] Error 2  
> Makefile:240: recipe for target ‘runtest’ failed  
> make: *\** \[runtest\] Error 2

![这里写图片描述][SouthEast]  
![这里写图片描述][SouthEast 1]

imencode，imread都是OpenCV的函数，但是opencv明明已经正确安装了啊，而且前几天faster rcnn已经安装运行成功并且训练了自己的模型，demo程序更是没问题，没道理啊。  
用google搜索找了半天，尝试了搜索上的各种办法都无效，最后想到用ldd命令列出libcaffe.so.1.0.0-rc5依赖的动态库，发现了问题，如下图：  
![这里写图片描述][SouthEast 2]

原来我使用的另一个第三方程序cassdk中自带了opencv动态库，而且它在LD\_LIBRARY\_PATH的优先级更高，所以libcaffe.so.1.0.0-rc5在运行时使用了cassdk下的opencv库，而不是我apt-get安装的opencv库。

果断卸载了这个程序，再用ldd命令查看，这下依赖关系正常了。  
![这里写图片描述][SouthEast 3]

再运行py-faster-rcnn/tools/demo.py则一切正常。

**总结**  
遇到这种undefined symbol的问题，先别急着重装对应的库，用ldd命令看看动态库依赖关系，更有助于找到问题的根本原因。

[SouthEast]: /images/20220705/e031d7b1b3aa403c95c93e0fd5227f5c.png
[SouthEast 1]: /images/20220705/96063018df374780b8bf23bbdd5cbe87.png
[SouthEast 2]: /images/20220705/b2a8bc8e732e4735ba46fa21d616089a.png
[SouthEast 3]: /images/20220705/51ca2ce57f924d988c555c7fc7f6b9f6.png