setUpNet DNN module was not built with CUDA backend； switching to CPU
2020-09-02 08:35
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[ WARN:0] global /tmp/pip-req-build-sw_3pm_8/opencv/modules/dnn/src/dnn.cpp (1429) setUpNet DNN module was not built with CUDA backend; switching to CPU
解决办法：如果编译opencv4.4的时候已经编译了cuda还是报这个错。
就执行一下sudo ldconfig就可以了。
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