[GitHub] [incubator-mxnet] cyrusbehr opened a new issue #15261: C++ Can't load model with Symbol::Load when using static library

[GitBox <gi...@apache.org>]

cyrusbehr opened a new issue #15261: C++ Can't load model with Symbol::Load when using static library
URL: https://github.com/apache/incubator-mxnet/issues/15261
 
 
   ## Description
   When I use the shared library for mxnet, I am able to load models as expected using `Symbol::Load(filepath)`
   However, when I switch to the static library, I get the following error on the `Symbol::Load` function call:
   ```
   terminate called after throwing an instance of 'dmlc::Error'
     what():  [15:42:04] /home/nchafni/Cyrus/myproject/include/mxnet-cpp/symbol.hpp:102: Check failed: MXSymbolCreateFromFile(file_name.c_str(), &(handle)) == 0 (-1 vs. 0) : 
   Stack trace:
     [bt] (0) /home/nchafni/Cyrus/myproject/myproject(dmlc::LogMessageFatal::~LogMessageFatal()+0x4a) [0x5593a17b4b9e]
     [bt] (1) /home/nchafni/Cyrus/myproject/myproject(mxnet::cpp::Symbol::Load(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)+0xf8) [0x5593a17d2342]
     [bt] (2) /home/nchafni/Cyrus/myproject/myproject(myproject::loadModel(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)+0x32) [0x5593a17cd488]
     [bt] (3) /home/nchafni/Cyrus/myproject/myproject(myproject::myproject()+0x181) [0x5593a17ccf47]
     [bt] (4) /home/nchafni/Cyrus/myproject/myproject(main+0x1a9) [0x5593a17b3664]
     [bt] (5) /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7) [0x7fc680bd1b97]
     [bt] (6) /home/nchafni/Cyrus/myproject/myproject(_start+0x2a) [0x5593a17b2dfa]
   ```
   
   Due to the requirements of my project, I need to link mxnet as a static library. 
   
   ## Information
   I am using Ubuntu 18.04.2
   
   
   ## File Structure
   myproject
   | __ CMakeLists.txt
   | __ lib
   |     | __ libmxnet.so
   |     | __ libmxnet.a
   |     | __ libdmlc.a
   |     | __ libopencv_core.a
   |     | __ libopencv_highgui.a
   |     | __ libopencv_video.a
   | __ include
   |     | __ dlpack
   |     | __ dmlc
   |     | __ mkldnn
   |     | __ mshadow
   |     | __ mxnet
   |     | __ mxnet-cpp
   | __ main.cpp
   | __ models (mxnet models in here)
   
   ## CMakeLists.txt
   Here is my CMakeLists.txt used to link the **shared** mxnet. This one works as expected
   
   ```
   cmake_minimum_required(VERSION 2.8)
   project(myproject C CXX)
   
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
   
   include_directories(${CMAKE_CURRENT_LIST_DIR}/include)
   
   link_directories(${CMAKE_CURRENT_LIST_DIR}/lib)
   find_package(OpenCV REQUIRED)
   find_package(OpenMP REQUIRED)
   
   list(APPEND LINKER_LIBS opencv_core opencv_highgui opencv_video opencv_imgcodecs libmxnet.so)
   
   file(GLOB SRC ${CMAKE_CURRENT_LIST_DIR}/main.cpp)
   
   set(COMPILE_CODE ${SRC})
   
   add_executable(myproject ${COMPILE_CODE})
   target_link_libraries(myproject ${LINKER_LIBS} ${OpenMP_CXX_LIBRARIES})
   
   ```
   Here is the CMakeLists.txt used to link the **static** mxnet library:
   
   ```
   cmake_minimum_required(VERSION 2.8)
   project(myproject C CXX)
   
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
   
   include_directories(${CMAKE_CURRENT_LIST_DIR}/include)
   
   link_directories(${CMAKE_CURRENT_LIST_DIR}/lib)
   find_package(OpenCV REQUIRED)
   find_package(OpenMP REQUIRED)
   
   list(APPEND LINKER_LIBS opencv_core opencv_highgui opencv_video opencv_imgcodecs libmxnet.a libdmlc.a rt)
   
   file(GLOB SRC ${CMAKE_CURRENT_LIST_DIR}/main.cpp)
   
   set(COMPILE_CODE ${SRC})
   
   add_executable(myproject ${COMPILE_CODE})
   target_link_libraries(myproject ${LINKER_LIBS} ${OpenMP_CXX_LIBRARIES})
   
   ```
   ## The Code
   The code for loading the model was obtained from the example in the incubator-mxnet repo (https://github.com/apache/incubator-mxnet/blob/master/cpp-package/example/inference/inception_inference.cpp)
   
   Here is the code snippet used to load the model:
   
   ```
   void Predictor::LoadModel(const std::string& model_json_file) {
     if (!FileExists(model_json_file)) {
       LG << "Model file " << model_json_file << " does not exist";
       throw std::runtime_error("Model file does not exist");
     }
     LG << "Loading the model from " << model_json_file << std::endl;
     net = Symbol::Load(model_json_file);
   }
   ```
   Any help is much appreciated! 
   

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