II (a). Build ML libs from Scratch

Overview

The following packages will be installed:

• OpenBLAS 0.2.19
• Numpy 1.12.1
• OpenCV 3.2

OpenBLAS 0.2.19

Install LAPACK.

sudo apt install liblapacke-dev

Make and install (be careful of the prefix).

make
sudo make PREFIX=/usr/local/openblas install

Add the following to .bashrc

export PATH=$PATH:/usr/local/openblas/bin
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/openblas/lib
export CPATH=$CPATH:/usr/local/openblas/include

Numpy 1.12.1

Download Numpy (https://github.com/numpy/numpy/releases/tag/v1.12.1)

sudo apt install libfftw3-dev
cd numpy
cp site.cfg.example site.cfg

Uncomment these lines to enable OpenBLAS and fftw3.

[openblas]
libraries = openblas
library_dirs = /usr/local/openblas/lib
include_dirs = /usr/local/openblas/include

[fftw]
libraries = fftw3

Check configuration, and the output should look something like this.

python setup.py config
openblas_info:
  FOUND:
    libraries = ['openblas', 'openblas']
    library_dirs = ['/usr/local/openblas/lib']
    language = c
    define_macros = [('HAVE_CBLAS', None)]

  FOUND:
    libraries = ['openblas', 'openblas']
    library_dirs = ['/usr/local/openblas/lib']
    language = c
    define_macros = [('HAVE_CBLAS', None)]

Then just build and install.

python setup.py build
sudo python setup.py install

Install OpenCV 3.2

Download:

• https://github.com/opencv/opencv/archive/3.2.0.zip
• https://github.com/opencv/opencv_contrib/archive/3.2.0.zip

Install dependent packages.

sudo apt install libjpeg8-dev libtiff5-dev libjasper-dev libpng12-dev libavcodec-dev libavformat-dev libswscale-dev libv4l-dev libxvidcore-dev libx264-dev libgtk-3-dev libatlas-base-dev

Configure CMAKE, build, and install. Note: don't compile under virtualenv, otherwise some of the libraries will have wrong Python path.

mkdir build && cd build
cmake -D CMAKE_BUILD_TYPE=RELEASE \
    -D WITH_OPENGL=ON \
    -D WITH_CUDA=ON \
    -D ENABLE_FAST_MATH=1 \
    -D CUDA_FAST_MATH=1 \
    -D WITH_CUBLAS=1 \
    -D CMAKE_INSTALL_PREFIX=/usr/local \
    -D INSTALL_PYTHON_EXAMPLES=ON \
    -D INSTALL_C_EXAMPLES=ON \
    -D OPENCV_EXTRA_MODULES_PATH=~/tmp/opencv_contrib-3.2.0/modules \
    -D BUILD_EXAMPLES=ON ..
make -j8
sudo make install

References

• http://withr.me/install-opencv-on-ubuntu-16/
• http://notes.maxwi.com/2017/03/01/ubuntu-compile-opencv2-with-cuda-and-ffmpeg/