Error loading libraries Python

[Mikkke46]

Hello Andrewssobral, i don't understand your step to install python API "/simple_vehicle_counting/build/cp -r ../python/* python/" . But i installed the program normally.
When i run the "demo.py" i have always import errors. The script is on the same root paste of the packet analysis.

Do you have any idea to solve my problem, or what i am doing wrong?

ERROR:

Traceback (most recent call last):
File "demo.py", line 4, in
import analysis
File "/home/miguel/simple_vehicle_counting/python/analysis/init.py", line 1, in
from _analysis import *
ImportError: No module named _analysis

[Lallapallooza]

Hi! I got same issues, steps I made to resolve it.

1. Add to main cmake i.e. CMakeLists.txt in main folder
   "add_definitions(-fPIC)"
2. Do same steps as in instruction but, copy python folder first i.e. cp step. Then use "cmake -D BUILD_PYTHON_SUPPORT=ON .." instead of "cmake .."
3. ....
4. PROFIT!!!

[ashish1405]

Hello ,

When I try to cmake like this it gives error

$ cmake -D BUILD_PYTHON_SUPPORT=ON -DPYTHON_LIBRARY=/opt/local/lib/libpython2.7.dylib -DPYTHON_EXECUTABLE=/opt/local/bin/python -DPYTHON_INCLUDE_DIR=/opt/local/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7/ -DUSE_SYSTEM_BOOST=NO ..
-- WITH PYTHON SUPPORT: ON
-- Found OpenCV: /opt/local (found version "3.2.0") 
-- OpenCV library status:
--     version: 3.2.0
--     libraries: opencv_calib3d;opencv_core;opencv_features2d;opencv_flann;opencv_highgui;opencv_imgcodecs;opencv_imgproc;opencv_ml;opencv_objdetect;opencv_photo;opencv_shape;opencv_stitching;opencv_superres;opencv_video;opencv_videoio;opencv_videostab;opencv_aruco;opencv_bgsegm;opencv_bioinspired;opencv_ccalib;opencv_datasets;opencv_dnn;opencv_dpm;opencv_face;opencv_freetype;opencv_fuzzy;opencv_line_descriptor;opencv_optflow;opencv_phase_unwrapping;opencv_plot;opencv_reg;opencv_rgbd;opencv_saliency;opencv_stereo;opencv_structured_light;opencv_surface_matching;opencv_text;opencv_tracking;opencv_xfeatures2d;opencv_ximgproc;opencv_xobjdetect;opencv_xphoto
--     include path: /opt/local/include;/opt/local/include/opencv
-- Found OpenCV: /opt/local (found version "3.2.0") found components:  core 
-- Found PythonInterp: /opt/local/bin/python (found suitable version "2.7.13", minimum required is "2.7") 
-- Found PythonLibs: /opt/local/lib/libpython2.7.dylib (found suitable exact version "2.7.13") 
-- Found PythonInterp: /Library/Frameworks/Python.framework/Versions/3.6/bin/python3 (found suitable version "3.6", minimum required is "3.5") 
-- Found PythonLibs: /Library/Frameworks/Python.framework/Versions/3.6/lib/libpython3.6m.dylib (found suitable exact version "3.6.0") 
CMake Warning at /opt/local/share/cmake-3.9/Modules/FindBoost.cmake:1564 (message):
  No header defined for python-py27; skipping header check
Call Stack (most recent call first):
  python/pyboostcvconverter/CMakeLists.txt:31 (find_package)


CMake Error at /opt/local/share/cmake-3.9/Modules/FindBoost.cmake:1877 (message):
  Unable to find the requested Boost libraries.

  Boost version: 1.59.0

  Boost include path: /opt/local/include

  Could not find the following Boost libraries:

          boost_python-py27

  No Boost libraries were found.  You may need to set BOOST_LIBRARYDIR to the
  directory containing Boost libraries or BOOST_ROOT to the location of
  Boost.
Call Stack (most recent call first):
  python/pyboostcvconverter/CMakeLists.txt:31 (find_package)


-- Boost version: 1.59.0
-- Found the following Boost libraries:
--   python
Include dirs of boost: /opt/local/include
Libs of boost: /opt/local/lib/libboost_python-mt.dylib
-- Found PythonLibs: /usr/lib/libpython2.7.dylib (found suitable version "2.7.10", minimum required is "2.7") 
Include dirs of Python: /usr/include/python2.7
Libs of Python: /usr/lib/libpython2.7.dylib
-- Configuring incomplete, errors occurred!

[Lallapallooza]

Your have problem with Boost python library. Try to compile without -DPYTHON_LIBRARY=/opt/local/lib/libpython2.7.dylib -DPYTHON_EXECUTABLE=/opt/local/bin/python -DPYTHON_INCLUDE_DIR=/opt/local/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7/ -DUSE_SYSTEM_BOOST=NO ..

[ashish1405]

Initially I just used cmake -D BUILD_PYTHON_SUPPORT=ON .. but it was giving same error, so I added other things

[ashish1405]

BTW Andrew's bgslibrary is compiling fine with -DBGS_PYTHON_SUPPORT=ON flag

[ashish1405]

Ok so modified the python/CMakeLists.txt, modified line 31 to find_package(Boost REQUIRED COMPONENTS python) and now cmake runs fine. But now getting linking error, BTW I'm on MACOS

[ 60%] Linking CXX shared library pbcvt.so
Undefined symbols for architecture x86_64:
  "_PyCObject_AsVoidPtr", referenced from:
      pbcvt::init_module_pbcvt() in python_module.cpp.o
  "_PyCObject_Type", referenced from:
      pbcvt::init_module_pbcvt() in python_module.cpp.o
  "_PyErr_Format", referenced from:
.....

"__Py_NoneStruct", referenced from:
      __GLOBAL__sub_I_pyboost_cv2_converter.cpp in pyboost_cv2_converter.cpp.o
      pbcvt::fromMatToNDArray(cv::Mat const&) in pyboost_cv3_converter.cpp.o
      pbcvt::matToNDArrayBoostConverter::convert(cv::Mat const&) in pyboost_cv3_converter.cpp.o
      __GLOBAL__sub_I_pyboost_cv3_converter.cpp in pyboost_cv3_converter.cpp.o
      __GLOBAL__sub_I_python_module.cpp in python_module.cpp.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [python/pyboostcvconverter/pbcvt.so] Error 1
make[1]: *** [python/pyboostcvconverter/CMakeFiles/pbcvt.dir/all] Error 2
make: *** [all] Error 2

[irwansyahrmd]

Hi, I have some problem. I had tried the solutions above, but still the same. Any suggestion?

[dragonxtek]

I solved!
First, check if you clone pyboostcvconverter submodule. If this folder is empty, it's better clone this proyect with --recursive
Second, edit line 44 in CMakeLists.txt and add -fPIC in ADD_DEFINITIONS
Third, follow this commands:

apt-get install libboost-python-dev
cmake -D BUILD_PYTHON_SUPPORT=ON ..
mkdir python
cp -r ../python/* python
../run_python_demo.sh

[senkumartup]

1. Install Boost library for Python
   sudo apt-get install libboost-python-dev

2. Clone the repo
   mkdir work
   cd work
   git clone --recursive https://github.com/andrewssobral/simple_vehicle_counting.git

3. Apply Patch
   cd simple_vehicle_counting
   patch -p1 <fix.diff
   git diff

4. Build
   cd build
   mkdir python
   cp -r ../python/* python
   cmake -D BUILD_PYTHON_SUPPORT=ON ..
   make

5. Run demo
   ../run_python_demo.sh

fix.diff
diff --git a/CMakeLists.txt b/CMakeLists.txt
index c205e27..5a5fd9b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -41,7 +41,7 @@ endforeach(OUTPUTCONFIG CMAKE_CONFIGURATION_TYPES)

IF (UNIX)
# add some standard warnings

• ADD_DEFINITIONS(-Wno-variadic-macros -Wno-long-long -Wall -Wextra -Winit-self -Woverloaded-virtual -Wsign-promo -Wno-unused-parameter -pedantic -Woverloaded-virtual -Wno-unknown-pragmas)

• ADD_DEFINITIONS(-Wno-variadic-macros -Wno-long-long -Wall -Wextra -Winit-self -Woverloaded-virtual -Wsign-promo -Wno-unused-parameter -pedantic -Woverloaded-virtual -Wno-unknown-pragmas -fPIC)

  -ansi does not compile with sjn module

  #ADD_DEFINITIONS(-ansi)