Cannot compile a cpp predictor including the library c_predict_api.h

[CarlosYeverino]

Hi all,

I successfully installed mxnet on Ubuntu 16.04 LTS by doing the following:

git clone --recursive https://github.com/apache/incubator-mxnet.git
cd incubator-mxnet
make -j $(nproc) USE_OPENCV=1 USE_BLAS=openblas USE_CUDA=1 USE_CUDA_PATH=/usr/local/cuda USE_CUDNN=1 USE_CPP_PACKAGE=1

Now I want to create a cpp predictor that includes the library c_predict_api.h, however, when I compile the the program I got the following error:

carlos@carlos-ubuntu:~/Documents/git/torcs_dl/doc/deep_driving_project/target/Mastercomponent/build$ cmake ..
-- Using these message generators: gencpp;genlisp;genpy
-- Configuring done
-- Generating done
-- Build files have been written to: /home/carlos/Documents/git/torcs_dl/doc/deep_driving_project/target/Mastercomponent/build
carlos@carlos-ubuntu:~/Documents/git/torcs_dl/doc/deep_driving_project/target/Mastercomponent/build$ make
[ 25%] Linking CXX static library libdp_mastercomponent.a
[ 25%] Built target dp_mastercomponent
[ 50%] Linking CXX static library libRosAdapter_dp_mastercomponent.a
[ 50%] Built target RosAdapter_dp_mastercomponent
[ 75%] Building CXX object dp_mastercomponent/coordinator/CMakeFiles/Coordinator_dp_mastercomponent.dir/Coordinator_dp_mastercomponent.cpp.o
In file included from /home/carlos/Documents/git/torcs_dl/doc/deep_driving_project/target/Mastercomponent/dp_mastercomponent/cpp/dp_mastercomponent_dpnet.h:7:0,
                 from /home/carlos/Documents/git/torcs_dl/doc/deep_driving_project/target/Mastercomponent/dp_mastercomponent/cpp/dp_mastercomponent.h:7,
                 from /home/carlos/Documents/git/torcs_dl/doc/deep_driving_project/target/Mastercomponent/dp_mastercomponent/coordinator/IAdapter_dp_mastercomponent.h:2,
                 from /home/carlos/Documents/git/torcs_dl/doc/deep_driving_project/target/Mastercomponent/dp_mastercomponent/coordinator/Coordinator_dp_mastercomponent.cpp:6:
/home/carlos/Documents/git/torcs_dl/doc/deep_driving_project/target/Mastercomponent/dp_mastercomponent/cpp/CNNPredictor_dp_mastercomponent_dpnet.h:4:33: fatal error: mxnet/c_predict_api.h: No such file or directory
compilation terminated.
dp_mastercomponent/coordinator/CMakeFiles/Coordinator_dp_mastercomponent.dir/build.make:62: recipe for target 'dp_mastercomponent/coordinator/CMakeFiles/Coordinator_dp_mastercomponent.dir/Coordinator_dp_mastercomponent.cpp.o' failed
make[2]: *** [dp_mastercomponent/coordinator/CMakeFiles/Coordinator_dp_mastercomponent.dir/Coordinator_dp_mastercomponent.cpp.o] Error 1
CMakeFiles/Makefile2:128: recipe for target 'dp_mastercomponent/coordinator/CMakeFiles/Coordinator_dp_mastercomponent.dir/all' failed
make[1]: *** [dp_mastercomponent/coordinator/CMakeFiles/Coordinator_dp_mastercomponent.dir/all] Error 2
Makefile:83: recipe for target 'all' failed

Then I added the path /incubator-mxnet/lib to LD_LIBRARY_PATH in ~/.bashrc and now I get the follofing output for LD_LIBRARY_PATH:

carlos@carlos-ubuntu:~/Documents/git/torcs_dl/doc/deep_driving_project/target/Mastercomponent/build$ echo $LD_LIBRARY_PATH
/usr/local/lib:/home/carlos/Documents/git/incubator-mxnet/lib

However, this did not solve the issue.

This is why I have in the CMakeLists.txt related to mxnet:
set(LIBS ${LIBS} mxnet)

I also can see the following in build/dp_mastercomponent/cpp/dp_mastercomponent.cmake: INTERFACE_LINK_LIBRARIES "/usr/lib/x86_64-linux-gnu/libarmadillo.so;mxnet"

What is the proper way to make MXNet visible to the cpp predictor?

[zachgk]

@mxnet-label-bot add [C++, Question]

Hi @CarlosYeverino, have you taken a look at the C++ Tutorial at https://mxnet.incubator.apache.org/tutorials/c%2B%2B/basics.html?

[leleamol]

@mxnet-label-bot update [C API, Question]

[ThomasDelteil]

I think it is not a missing library but a missing header file, have you included mxnet/c_predict_api.h in your include flags?

[CarlosYeverino]

Hi @zachgk and @ThomasDelteil ,

thanks for your replay. I managed to fix the issue by copying the compiled files from the directories lib and include of my cloned repository to /usr/lib and /usr/include respectively.

However, I would like to know how to fix the issue using environment variables in Ubuntu insted of copying the files to /usr.