Deep learning in Ubuntu: Darknet YOLOv3

This post describes setting up object detection features of Darknet neural network framework, coupled with camera input, using the YOLOv3 pretrained network, designed by Joseph Redmon and Ali Farhadi, 2018.
See https://pjreddie.com/darknet/yolo/

The prerequisites are an ubuntu system, equipped with a GPU, with appropriate drivers, CUDA, and Opencv, as well as the Darknet tools.
All these are described in the previous posts.

1.Follow instructions from https://pjreddie.com/darknet/yolo/ for weights download and testing with image based object detection.
I get errors in processing the image recognition samples

$ ./darknet detector test ./cfg/coco.data ./cfg/yolov3.cfg ./cfg/yolov3.weights ./data/dog.jpg
layer     filters    size              input                output
    0 conv     32  3 x 3 / 1   608 x 608 x   3   ->   608 x 608 x  32  0.639 BFLOPs
    1 conv     64  3 x 3 / 2   608 x 608 x  32   ->   304 x 304 x  64  3.407 BFLOPs
    2 conv     32  1 x 1 / 1   304 x 304 x  64   ->   304 x 304 x  32  0.379 BFLOPs
    3 CUDA Error: out of memory
darknet: ./src/cuda.c:36: check_error: Assertion `0' failed.
Aborted (core dumped)

I retry with tiny model (i download the tiny network weights) and now it works

$ ./darknet detector test ./cfg/coco.data ./cfg/yolov3-tiny.cfg ./cfg/yolov3-tiny.weights ./data/dog.jpg

...

Loading weights from cfg/yolov3-tiny.weights...Done!

data/dog.jpg: Predicted in 0.192830 seconds.

dog: 56%

car: 52%

truck: 56%

car: 62%

bicycle: 58%

It seems that the error comes from the network configurations in cfg/yolov3.cfg

Comparing the yolov3.cfg and the yolov3-tiny.cfg i managed to find parameter to have the network run correctly with the larger weight-set

I edited the first lines of yolov3.cfg as follows

[net]

# Testing

batch=1

subdivisions=1

# Training

#batch=64

#subdivisions=16

#width=608

#height=608

width=416

height=416

channels=3

[...]

And now it works!

$ ./darknet detector test cfg/coco.data cfg/yolov3.cfg cfg/yolov3.weights data/dog.jpg

[...]

Loading weights from cfg/yolov3.weights...Done!

data/dog.jpg: Predicted in 0.327576 seconds.

dog: 99%

truck: 93%

bicycle: 99%

(base) mgua@mgtp53s:~/darknet/darknet$ 

2.install mplayer to have the libraries required to access the camera feed
#apt update
#apt install mplayer


3.run

$./darknet detector demo ./cfg/voc.data ./cfg/yolov3-voc.cfg ./cfg/yolov3-voc.weights

or, for light model

$./darknet detector demo ./cfg/coco.data ./cfg/yolov3-tiny.cfg ./cfg/yolov3-tiny.weights




On my laptop computer, with GPU Nvidia Quadro P520, OpenCV and CUDA I get about 6 FPS (frames per second) with the full weights set and 16 FPS with the tiny model.




The following syntax should allow to use YOLO getting input from a network camera:

$./darknet detector demo ./cfg/voc.data ./cfg/yolo-voc.cfg ./cfg/yolo-voc.weights rtsp://login:pass@192.168.0.228:554 -i 0






Deep learning in Ubuntu: installing darknet

This document describes how I added the darknet components to my Ubuntu deep learning machines.

Darknet is an open source environment for neural networks, written in C, by Joseph Redmon, aka pjreddie.
Darknet is very fast.

See https://pjreddie.com/darknet/

This document describes the installation of darknet on top of an ubuntu 18.04 linux machine,
equipped with a NVIDIA GPU board, where CUDA and OPENCV have been installed
(see these: NVIDIA and CUDA Setup and OPENCV setup).
The installation process is relying on Darknet setup instructions, but for my environment required some additional steps.

working in user mode, I create a darknet folder in my home

$cd
$mkdir darknet
$cd darknet
$git clone https://github.com/pjreddie/darknet.git
$cd darknet

Edit the Makefile, adjusting options GPU=1 and OPENCV=1

then running make

$make

it chokes giving many errors like

Package opencv was not found in the pkg-config search path.
Perhaps you should add the directory containing `opencv.pc'
to the PKG_CONFIG_PATH environment variable
No package 'opencv' found

---
Examining the Makefile, you can see that it uses the commands

pkg-config --libs opencv

and 

pkg-config --cflags opencv

Looking around I found https://stackoverflow.com/questions/15320267/package-opencv-was-not-found-in-the-pkg-config-search-path which guides me to the solution:

1) install apt-file and update its library

#apt install apt-file

#apt-file update

2) look which package provides the file opecv.pc

#apt-file search opencv.pc

libopencv-dev: /usr/lib/x86_64-linux-gnu/pkgconfig/opencv.pc

3) install libopecv-dev

#apt install libopencv-dev

4) re-executing make, which now does not give any more errors...

$cd

$cd darknet/darknet

$make

5) and finally now you can see the eagles...

$./darknet imtest data/eagle.jpg

A potentially useful tool for showing pictures from command line is feh. It allows zoom and it is very handy.

Deep Learning in Ubuntu: opencv 4.1.0/4.1.1

A Deep Learning environment in Ubuntu 18.04 Bionic Beaver:
OpenCV 4.1.0/4.1.1
(updated sept 6, 2019)

After the previous article describing the setup of the operating system environment for Nvidia and CUDA libraries, here are the steps I performed to  download and set up the OpenCV environment to be accessible by a single user.

We assume the system has a user named "deep"

$whoami
deep
$sudo bash
#

Activities performed within root: prerequisites

#apt-get update

#apt-get install build-essential checkinstall cmake pkg-config yasm

#apt-get install git gfortran libjpeg8-dev libpng-dev libtiff-dev

  (apt-get install libjasper1) not available in std repositories

#apt-get install libavcodec-dev libavformat-dev libswscale-dev libdc1394-22-dev libxine2-dev libv4l-dev

#apt-get install libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev libgtk2.0-dev libtbb-dev qt5-default libatlas-base-dev libfaac-dev libmp3lame-dev libtheora-dev libvorbis-dev 

#apt-get install libxvidcore-dev libopencore-amrnb-dev libopencore-amrwb-dev libavresample-dev x264 v4l-utils

(the following appears to be quite useful in resolving path related issues)
#apt install apt-file
...
#apt-file update

(you can use apt-file to search where specific files have been installed, for example: #apt-file search opencv.pc
libopencv-dev: /usr/lib/x86_64-linux-gnu/pkgconfig/opencv.pc

This means that the file opencv.pc is in the package libopencv-dev
)

switch back to user "deep"

Commands to download opencv 4.1.0/4.1.1 and related contrib
(adjust commands accordingly for v4.1.1: contrib files are the same)

$cd

$mkdir opencv

$cd opencv

$pwd

/home/deep/opencv

$wget https://github.com/opencv/opencv/archive/4.1.0.zip

$git clone https://github.com/opencv/opencv_contrib.git

$unzip 4.1.0.zip

$ ls -la

-rw-r--r--  1 deep deep 91806599 lug 18 19:17 4.1.0.zip

drwxr-xr-x 11 deep deep     4096 apr  7 19:09 opencv-4.1.0

drwxr-xr-x  7 deep deep     4096 lug  1 11:18 opencv_contrib

(base) deep@TSP339:~/opencv$

Commands to prepare dirs and perform compilation

(if something goes wrong, clean the build folder, recreate it and restart cmake process)

the following cmake command was ok for my install of opencv-4.1.0


   
$cd opencv-4.1.0

$mkdir build

$cd build

$cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/home/deep/opencv/opencv-4.1.0/build/installation/OpenCV-4.1.0 -D INSTALL_C_EXAMPLES=ON -D INSTALL_PYTHON_EXAMPLES=ON -D WITH_CUDA=ON -D WITH_TBB=ON -D WITH_V4L=ON

-D OPENCV_PYTHON3_INSTALL_PATH=/home/deep/opencv/opencv-4.1.0/OpenCV-4.1.0-py3/lib/python3.5/site-packages -D WITH_QT=ON -D WITH_OPENGL=ON -D OPENCV_EXTRA_MODULES_PATH=/home/deep/opencv/opencv_contrib/modules -D BUILD_EXAMPLES=ON ..

edit sept 6 2019: (here the cmake command is shown with better formatting)

$cmake -D CMAKE_BUILD_TYPE=RELEASE \

            -D CMAKE_INSTALL_PREFIX=/home/deep/opencv/opencv-4.1.0/build/installation/OpenCV-4.1.0 \

            -D INSTALL_C_EXAMPLES=ON \

            -D INSTALL_PYTHON_EXAMPLES=ON \

            -D WITH_CUDA=ON \

            -D WITH_TBB=ON \

            -D WITH_V4L=ON \

            -D OPENCV_PYTHON3_INSTALL_PATH=/home/deep/opencv/opencv-4.1.0/OpenCV-4.1.0-py3/lib/python3.5/site-packages \

        -D WITH_QT=ON \

        -D WITH_OPENGL=ON \

        -D OPENCV_EXTRA_MODULES_PATH=/home/deep/opencv/opencv_contrib/modules \

        -D BUILD_EXAMPLES=ON ..


the following cmake command went fine for me with opencv-4.1.1: I performed this setup having anaconda environment operational. several adjustments were needed to have it run smooth. Also I used dynamic python code to correctly define the paths. 
cmake and make are run from unprivileged user. make install requires root privileges.

Here the destination path for the opencv libraries is in /usr/local This seems to be the best choice.

$conda create -n opencv python=3.7 anaconda

$conda activate opencv

(conda deactivate to get out of the environment)

# C & python only, with cuda, no examples, no tests

cmake \

        -D CMAKE_BUILD_TYPE=RELEASE \

        -D CMAKE_INSTALL_PREFIX=/usr/local \

        -D INSTALL_C_EXAMPLES=OFF \

        -D INSTALL_PYTHON_EXAMPLES=OFF \

        -D BUILD_TIFF=ON \

        -D BUILD_opencv_java=OFF \

        -D BUILD_TESTS=OFF \

        -D BUILD_PERF_TESTS=OFF \

        -D WITH_CUDA=ON \

        -D WITH_TBB=ON \

        -D WITH_IPP=ON \

        -D WITH_EIGEN=ON \

        -D WITH_V4L=ON \

        -D WITH_QT=ON \

        -D WITH_OPENGL=ON \

        -D BUILD_opencv_python2=OFF \

        -D PYTHON3_EXECUTABLE=$(which python3) \

        -D PYTHON3_INCLUDE_DIR=$(python3 -c "from distutils.sysconfig import get_python_inc; print(get_python_inc())") \

        -D PYTHON3_PACKAGES_PATH=$(python3 -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())") \

        -D OPENCV_EXTRA_MODULES_PATH=~/opencv/opencv_contrib/modules \

        -D CUDA_NVCC_FLAGS="-ccbin gcc-6" \

        ..

The opencv-4.1.0 cmake (not related to the just described cmake) outcome follows:

(base) deep@TSP339:~/opencv/opencv-4.1.0/build$ cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/home/deep/opencv/opencv-4.1.0/build/installation/OpenCV-4.1.0 -D INSTALL_C_EXAMPLES=ON -D INSTALL_PYTHON_EXAMPLES=ON -D WITH_CUDA=ON -D WITH_TBB=ON -D WITH_V4L=ON -D OPENCV_PYTHON3_INSTALL_PATH=/home/deep/opencv/opencv-4.1.0/OpenCV-4.1.0-py3/lib/python3.5/site-packages -D WITH_QT=ON -D WITH_OPENGL=ON -D OPENCV_EXTRA_MODULES_PATH=/home/deep/opencv/opencv_contrib/modules -D BUILD_EXAMPLES=ON ..
-- The CXX compiler identification is GNU 7.4.0
-- The C compiler identification is GNU 7.4.0
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Found PythonInterp: /usr/bin/python2.7 (found suitable version "2.7.15", minimum required is "2.7")
-- Could NOT find PythonLibs (missing: PYTHON_LIBRARIES PYTHON_INCLUDE_DIRS) (Required is exact version "2.7.15")
Traceback (most recent call last):
  File "", line 1, in
ImportError: No module named numpy.distutils
-- Found PythonInterp: /home/deep/anaconda3/bin/python3 (found suitable version "3.7.3", minimum required is "3.2")
-- Could NOT find PythonLibs (missing: PYTHON_LIBRARIES PYTHON_INCLUDE_DIRS) (Required is exact version "3.7.3")
-- Looking for ccache - not found
-- Performing Test HAVE_CXX_FSIGNED_CHAR
-- Performing Test HAVE_CXX_FSIGNED_CHAR - Success
-- Performing Test HAVE_C_FSIGNED_CHAR
-- Performing Test HAVE_C_FSIGNED_CHAR - Success
-- Performing Test HAVE_CXX_W
-- Performing Test HAVE_CXX_W - Success
-- Performing Test HAVE_C_W
-- Performing Test HAVE_C_W - Success
-- Performing Test HAVE_CXX_WALL
-- Performing Test HAVE_CXX_WALL - Success
-- Performing Test HAVE_C_WALL
-- Performing Test HAVE_C_WALL - Success
-- Performing Test HAVE_CXX_WERROR_RETURN_TYPE
-- Performing Test HAVE_CXX_WERROR_RETURN_TYPE - Success
-- Performing Test HAVE_C_WERROR_RETURN_TYPE
-- Performing Test HAVE_C_WERROR_RETURN_TYPE - Success
-- Performing Test HAVE_CXX_WERROR_NON_VIRTUAL_DTOR
-- Performing Test HAVE_CXX_WERROR_NON_VIRTUAL_DTOR - Success
-- Performing Test HAVE_C_WERROR_NON_VIRTUAL_DTOR
-- Performing Test HAVE_C_WERROR_NON_VIRTUAL_DTOR - Success
-- Performing Test HAVE_CXX_WERROR_ADDRESS
-- Performing Test HAVE_CXX_WERROR_ADDRESS - Success
-- Performing Test HAVE_C_WERROR_ADDRESS
-- Performing Test HAVE_C_WERROR_ADDRESS - Success
-- Performing Test HAVE_CXX_WERROR_SEQUENCE_POINT
-- Performing Test HAVE_CXX_WERROR_SEQUENCE_POINT - Success
-- Performing Test HAVE_C_WERROR_SEQUENCE_POINT
-- Performing Test HAVE_C_WERROR_SEQUENCE_POINT - Success
-- Performing Test HAVE_CXX_WFORMAT
-- Performing Test HAVE_CXX_WFORMAT - Success
-- Performing Test HAVE_C_WFORMAT
-- Performing Test HAVE_C_WFORMAT - Success
-- Performing Test HAVE_CXX_WERROR_FORMAT_SECURITY
-- Performing Test HAVE_CXX_WERROR_FORMAT_SECURITY - Success
-- Performing Test HAVE_C_WERROR_FORMAT_SECURITY
-- Performing Test HAVE_C_WERROR_FORMAT_SECURITY - Success
-- Performing Test HAVE_CXX_WMISSING_DECLARATIONS
-- Performing Test HAVE_CXX_WMISSING_DECLARATIONS - Success
-- Performing Test HAVE_C_WMISSING_DECLARATIONS
-- Performing Test HAVE_C_WMISSING_DECLARATIONS - Success
-- Performing Test HAVE_CXX_WMISSING_PROTOTYPES
-- Performing Test HAVE_CXX_WMISSING_PROTOTYPES - Failed
-- Performing Test HAVE_C_WMISSING_PROTOTYPES
-- Performing Test HAVE_C_WMISSING_PROTOTYPES - Success
-- Performing Test HAVE_CXX_WSTRICT_PROTOTYPES
-- Performing Test HAVE_CXX_WSTRICT_PROTOTYPES - Failed
-- Performing Test HAVE_C_WSTRICT_PROTOTYPES
-- Performing Test HAVE_C_WSTRICT_PROTOTYPES - Success
-- Performing Test HAVE_CXX_WUNDEF
-- Performing Test HAVE_CXX_WUNDEF - Success
-- Performing Test HAVE_C_WUNDEF
-- Performing Test HAVE_C_WUNDEF - Success
-- Performing Test HAVE_CXX_WINIT_SELF
-- Performing Test HAVE_CXX_WINIT_SELF - Success
-- Performing Test HAVE_C_WINIT_SELF
-- Performing Test HAVE_C_WINIT_SELF - Success
-- Performing Test HAVE_CXX_WPOINTER_ARITH
-- Performing Test HAVE_CXX_WPOINTER_ARITH - Success
-- Performing Test HAVE_C_WPOINTER_ARITH
-- Performing Test HAVE_C_WPOINTER_ARITH - Success
-- Performing Test HAVE_CXX_WSHADOW
-- Performing Test HAVE_CXX_WSHADOW - Success
-- Performing Test HAVE_C_WSHADOW
-- Performing Test HAVE_C_WSHADOW - Success
-- Performing Test HAVE_CXX_WSIGN_PROMO
-- Performing Test HAVE_CXX_WSIGN_PROMO - Success
-- Performing Test HAVE_C_WSIGN_PROMO
-- Performing Test HAVE_C_WSIGN_PROMO - Failed
-- Performing Test HAVE_CXX_WUNINITIALIZED
-- Performing Test HAVE_CXX_WUNINITIALIZED - Success
-- Performing Test HAVE_C_WUNINITIALIZED
-- Performing Test HAVE_C_WUNINITIALIZED - Success
-- Performing Test HAVE_CXX_WNO_DELETE_NON_VIRTUAL_DTOR
-- Performing Test HAVE_CXX_WNO_DELETE_NON_VIRTUAL_DTOR - Success
-- Performing Test HAVE_C_WNO_DELETE_NON_VIRTUAL_DTOR
-- Performing Test HAVE_C_WNO_DELETE_NON_VIRTUAL_DTOR - Failed
-- Performing Test HAVE_CXX_WNO_UNNAMED_TYPE_TEMPLATE_ARGS
-- Performing Test HAVE_CXX_WNO_UNNAMED_TYPE_TEMPLATE_ARGS - Failed
-- Performing Test HAVE_C_WNO_UNNAMED_TYPE_TEMPLATE_ARGS
-- Performing Test HAVE_C_WNO_UNNAMED_TYPE_TEMPLATE_ARGS - Failed
-- Performing Test HAVE_CXX_WNO_COMMENT
-- Performing Test HAVE_CXX_WNO_COMMENT - Success
-- Performing Test HAVE_C_WNO_COMMENT
-- Performing Test HAVE_C_WNO_COMMENT - Success
-- Performing Test HAVE_CXX_WIMPLICIT_FALLTHROUGH_3
-- Performing Test HAVE_CXX_WIMPLICIT_FALLTHROUGH_3 - Success
-- Performing Test HAVE_C_WIMPLICIT_FALLTHROUGH_3
-- Performing Test HAVE_C_WIMPLICIT_FALLTHROUGH_3 - Success
-- Performing Test HAVE_CXX_WNO_STRICT_OVERFLOW
-- Performing Test HAVE_CXX_WNO_STRICT_OVERFLOW - Success
-- Performing Test HAVE_C_WNO_STRICT_OVERFLOW
-- Performing Test HAVE_C_WNO_STRICT_OVERFLOW - Success
-- Performing Test HAVE_CXX_FDIAGNOSTICS_SHOW_OPTION
-- Performing Test HAVE_CXX_FDIAGNOSTICS_SHOW_OPTION - Success
-- Performing Test HAVE_C_FDIAGNOSTICS_SHOW_OPTION
-- Performing Test HAVE_C_FDIAGNOSTICS_SHOW_OPTION - Success
-- Performing Test HAVE_CXX_WNO_LONG_LONG
-- Performing Test HAVE_CXX_WNO_LONG_LONG - Success
-- Performing Test HAVE_C_WNO_LONG_LONG
-- Performing Test HAVE_C_WNO_LONG_LONG - Success
-- Performing Test HAVE_CXX_PTHREAD
-- Performing Test HAVE_CXX_PTHREAD - Success
-- Performing Test HAVE_C_PTHREAD
-- Performing Test HAVE_C_PTHREAD - Success
-- Performing Test HAVE_CXX_FOMIT_FRAME_POINTER
-- Performing Test HAVE_CXX_FOMIT_FRAME_POINTER - Success
-- Performing Test HAVE_C_FOMIT_FRAME_POINTER
-- Performing Test HAVE_C_FOMIT_FRAME_POINTER - Success
-- Performing Test HAVE_CXX_FFUNCTION_SECTIONS
-- Performing Test HAVE_CXX_FFUNCTION_SECTIONS - Success
-- Performing Test HAVE_C_FFUNCTION_SECTIONS
-- Performing Test HAVE_C_FFUNCTION_SECTIONS - Success
-- Performing Test HAVE_CXX_FDATA_SECTIONS
-- Performing Test HAVE_CXX_FDATA_SECTIONS - Success
-- Performing Test HAVE_C_FDATA_SECTIONS
-- Performing Test HAVE_C_FDATA_SECTIONS - Success
-- Performing Test HAVE_CXX_MSSE (check file: cmake/checks/cpu_sse.cpp)
-- Performing Test HAVE_CXX_MSSE - Success
-- Performing Test HAVE_CXX_MSSE2 (check file: cmake/checks/cpu_sse2.cpp)
-- Performing Test HAVE_CXX_MSSE2 - Success
-- Performing Test HAVE_CXX_MSSE3 (check file: cmake/checks/cpu_sse3.cpp)
-- Performing Test HAVE_CXX_MSSE3 - Success
-- Performing Test HAVE_CXX_MSSSE3 (check file: cmake/checks/cpu_ssse3.cpp)
-- Performing Test HAVE_CXX_MSSSE3 - Success
-- Performing Test HAVE_CXX_MSSE4_1 (check file: cmake/checks/cpu_sse41.cpp)
-- Performing Test HAVE_CXX_MSSE4_1 - Success
-- Performing Test HAVE_CXX_MPOPCNT (check file: cmake/checks/cpu_popcnt.cpp)
-- Performing Test HAVE_CXX_MPOPCNT - Success
-- Performing Test HAVE_CXX_MSSE4_2 (check file: cmake/checks/cpu_sse42.cpp)
-- Performing Test HAVE_CXX_MSSE4_2 - Success
-- Performing Test HAVE_CXX_MF16C (check file: cmake/checks/cpu_fp16.cpp)
-- Performing Test HAVE_CXX_MF16C - Success
-- Performing Test HAVE_CXX_MFMA
-- Performing Test HAVE_CXX_MFMA - Success
-- Performing Test HAVE_CXX_MAVX (check file: cmake/checks/cpu_avx.cpp)
-- Performing Test HAVE_CXX_MAVX - Success
-- Performing Test HAVE_CXX_MAVX2 (check file: cmake/checks/cpu_avx2.cpp)
-- Performing Test HAVE_CXX_MAVX2 - Success
-- Performing Test HAVE_CXX_MAVX512F (check file: cmake/checks/cpu_avx512.cpp)
-- Performing Test HAVE_CXX_MAVX512F - Success
-- Performing Test HAVE_CXX_MAVX512F_MAVX512CD_MAVX512VL_MAVX512BW_MAVX512DQ (check file: cmake/checks/cpu_avx512skx.cpp)
-- Performing Test HAVE_CXX_MAVX512F_MAVX512CD_MAVX512VL_MAVX512BW_MAVX512DQ - Success
-- Performing Test HAVE_CPU_BASELINE_FLAGS
-- Performing Test HAVE_CPU_BASELINE_FLAGS - Success
-- Performing Test HAVE_CPU_DISPATCH_FLAGS_SSE4_1
-- Performing Test HAVE_CPU_DISPATCH_FLAGS_SSE4_1 - Success
-- Performing Test HAVE_CPU_DISPATCH_FLAGS_SSE4_2
-- Performing Test HAVE_CPU_DISPATCH_FLAGS_SSE4_2 - Success
-- Performing Test HAVE_CPU_DISPATCH_FLAGS_FP16
-- Performing Test HAVE_CPU_DISPATCH_FLAGS_FP16 - Success
-- Performing Test HAVE_CPU_DISPATCH_FLAGS_AVX
-- Performing Test HAVE_CPU_DISPATCH_FLAGS_AVX - Success
-- Performing Test HAVE_CPU_DISPATCH_FLAGS_AVX2
-- Performing Test HAVE_CPU_DISPATCH_FLAGS_AVX2 - Success
-- Performing Test HAVE_CPU_DISPATCH_FLAGS_AVX512_SKX
-- Performing Test HAVE_CPU_DISPATCH_FLAGS_AVX512_SKX - Success
-- Performing Test HAVE_CXX_FVISIBILITY_HIDDEN
-- Performing Test HAVE_CXX_FVISIBILITY_HIDDEN - Success
-- Performing Test HAVE_C_FVISIBILITY_HIDDEN
-- Performing Test HAVE_C_FVISIBILITY_HIDDEN - Success
-- Performing Test HAVE_CXX_FVISIBILITY_INLINES_HIDDEN
-- Performing Test HAVE_CXX_FVISIBILITY_INLINES_HIDDEN - Success
-- Performing Test HAVE_C_FVISIBILITY_INLINES_HIDDEN
-- Performing Test HAVE_C_FVISIBILITY_INLINES_HIDDEN - Failed
-- Looking for pthread.h
-- Looking for pthread.h - found
-- Looking for posix_memalign
-- Looking for posix_memalign - found
-- Looking for malloc.h
-- Looking for malloc.h - found
-- Looking for memalign
-- Looking for memalign - found
-- Check if the system is big endian
-- Searching 16 bit integer
-- Looking for sys/types.h
-- Looking for sys/types.h - found
-- Looking for stdint.h
-- Looking for stdint.h - found
-- Looking for stddef.h
-- Looking for stddef.h - found
-- Check size of unsigned short
-- Check size of unsigned short - done
-- Using unsigned short
-- Check if the system is big endian - little endian
-- Found ZLIB: /usr/lib/x86_64-linux-gnu/libz.so (found suitable version "1.2.11", minimum required is "1.2.3")
-- Found JPEG: /usr/lib/x86_64-linux-gnu/libjpeg.so 
-- Found TIFF: /usr/lib/x86_64-linux-gnu/libtiff.so (found version "4.0.9")
-- Performing Test HAVE_C_WNO_UNUSED_VARIABLE
-- Performing Test HAVE_C_WNO_UNUSED_VARIABLE - Success
-- Performing Test HAVE_C_WNO_UNUSED_FUNCTION
-- Performing Test HAVE_C_WNO_UNUSED_FUNCTION - Success
-- Performing Test HAVE_C_WNO_SHADOW
-- Performing Test HAVE_C_WNO_SHADOW - Success
-- Performing Test HAVE_C_WNO_MAYBE_UNINITIALIZED
-- Performing Test HAVE_C_WNO_MAYBE_UNINITIALIZED - Success
-- Performing Test HAVE_C_WNO_MISSING_PROTOTYPES
-- Performing Test HAVE_C_WNO_MISSING_PROTOTYPES - Success
-- Performing Test HAVE_C_WNO_MISSING_DECLARATIONS
-- Performing Test HAVE_C_WNO_MISSING_DECLARATIONS - Success
-- Performing Test HAVE_C_WNO_IMPLICIT_FALLTHROUGH
-- Performing Test HAVE_C_WNO_IMPLICIT_FALLTHROUGH - Success
-- Could NOT find Jasper (missing: JASPER_LIBRARIES JASPER_INCLUDE_DIR)
-- Performing Test HAVE_C_WNO_IMPLICIT_FUNCTION_DECLARATION
-- Performing Test HAVE_C_WNO_IMPLICIT_FUNCTION_DECLARATION - Success
-- Performing Test HAVE_C_WNO_UNINITIALIZED
-- Performing Test HAVE_C_WNO_UNINITIALIZED - Success
-- Performing Test HAVE_C_WNO_UNUSED_BUT_SET_PARAMETER
-- Performing Test HAVE_C_WNO_UNUSED_BUT_SET_PARAMETER - Success
-- Performing Test HAVE_C_WNO_UNUSED
-- Performing Test HAVE_C_WNO_UNUSED - Success
-- Performing Test HAVE_C_WNO_SIGN_COMPARE
-- Performing Test HAVE_C_WNO_SIGN_COMPARE - Success
-- Performing Test HAVE_C_WNO_POINTER_COMPARE
-- Performing Test HAVE_C_WNO_POINTER_COMPARE - Success
-- Performing Test HAVE_C_WNO_ABSOLUTE_VALUE
-- Performing Test HAVE_C_WNO_ABSOLUTE_VALUE - Failed
-- Performing Test HAVE_C_WNO_UNUSED_PARAMETER
-- Performing Test HAVE_C_WNO_UNUSED_PARAMETER - Success
-- Performing Test HAVE_C_WNO_STRICT_PROTOTYPES
-- Performing Test HAVE_C_WNO_STRICT_PROTOTYPES - Success
-- Found ZLIB: /usr/lib/x86_64-linux-gnu/libz.so (found version "1.2.11")
-- Found PNG: /usr/lib/x86_64-linux-gnu/libpng.so (found version "1.6.34")
-- Looking for /usr/include/libpng/png.h
-- Looking for /usr/include/libpng/png.h - found
-- Looking for semaphore.h
-- Looking for semaphore.h - found
-- Performing Test HAVE_CXX_WNO_SHADOW
-- Performing Test HAVE_CXX_WNO_SHADOW - Success
-- Performing Test HAVE_CXX_WNO_UNUSED
-- Performing Test HAVE_CXX_WNO_UNUSED - Success
-- Performing Test HAVE_CXX_WNO_SIGN_COMPARE
-- Performing Test HAVE_CXX_WNO_SIGN_COMPARE - Success
-- Performing Test HAVE_CXX_WNO_UNDEF
-- Performing Test HAVE_CXX_WNO_UNDEF - Success
-- Performing Test HAVE_CXX_WNO_MISSING_DECLARATIONS
-- Performing Test HAVE_CXX_WNO_MISSING_DECLARATIONS - Success
-- Performing Test HAVE_CXX_WNO_UNINITIALIZED
-- Performing Test HAVE_CXX_WNO_UNINITIALIZED - Success
-- Performing Test HAVE_CXX_WNO_SWITCH
-- Performing Test HAVE_CXX_WNO_SWITCH - Success
-- Performing Test HAVE_CXX_WNO_PARENTHESES
-- Performing Test HAVE_CXX_WNO_PARENTHESES - Success
-- Performing Test HAVE_CXX_WNO_ARRAY_BOUNDS
-- Performing Test HAVE_CXX_WNO_ARRAY_BOUNDS - Success
-- Performing Test HAVE_CXX_WNO_EXTRA
-- Performing Test HAVE_CXX_WNO_EXTRA - Success
-- Performing Test HAVE_CXX_WNO_DEPRECATED_DECLARATIONS
-- Performing Test HAVE_CXX_WNO_DEPRECATED_DECLARATIONS - Success
-- Performing Test HAVE_CXX_WNO_MISLEADING_INDENTATION
-- Performing Test HAVE_CXX_WNO_MISLEADING_INDENTATION - Success
-- Performing Test HAVE_CXX_WNO_DEPRECATED
-- Performing Test HAVE_CXX_WNO_DEPRECATED - Success
-- Performing Test HAVE_CXX_WNO_SUGGEST_OVERRIDE
-- Performing Test HAVE_CXX_WNO_SUGGEST_OVERRIDE - Success
-- Performing Test HAVE_CXX_WNO_INCONSISTENT_MISSING_OVERRIDE
-- Performing Test HAVE_CXX_WNO_INCONSISTENT_MISSING_OVERRIDE - Failed
-- Performing Test HAVE_CXX_WNO_IMPLICIT_FALLTHROUGH
-- Performing Test HAVE_CXX_WNO_IMPLICIT_FALLTHROUGH - Success
-- Found TBB (env): /usr/lib/x86_64-linux-gnu/libtbb.so
-- IPPICV: Download: ippicv_2019_lnx_intel64_general_20180723.tgz
-- found Intel IPP (ICV version): 2019.0.0 [2019.0.0 Gold]
-- at: /home/deep/opencv/opencv-4.1.0/build/3rdparty/ippicv/ippicv_lnx/icv
-- found Intel IPP Integration Wrappers sources: 2019.0.0
-- at: /home/deep/opencv/opencv-4.1.0/build/3rdparty/ippicv/ippicv_lnx/iw
-- Looking for pthread.h
-- Looking for pthread.h - found
-- Looking for pthread_create
-- Looking for pthread_create - not found
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
-- Found Threads: TRUE 
-- CUDA detected: 10.1
-- CUDA NVCC target flags: -gencode;arch=compute_30,code=sm_30;-gencode;arch=compute_35,code=sm_35;-gencode;arch=compute_37,code=sm_37;-gencode;arch=compute_50,code=sm_50;-gencode;arch=compute_52,code=sm_52;-gencode;arch=compute_60,code=sm_60;-gencode;arch=compute_61,code=sm_61;-gencode;arch=compute_70,code=sm_70;-gencode;arch=compute_75,code=sm_75;-D_FORCE_INLINES
-- Could not find OpenBLAS include. Turning OpenBLAS_FOUND off
-- Could not find OpenBLAS lib. Turning OpenBLAS_FOUND off
-- Could NOT find Atlas (missing: Atlas_CLAPACK_INCLUDE_DIR)
-- Looking for dgemm_
-- Looking for dgemm_ - found
-- A library with BLAS API found.
-- Looking for cheev_
-- Looking for cheev_ - found
-- A library with LAPACK API found.
-- Performing Test HAVE_CXX_WNO_MISSING_PROTOTYPES
-- Performing Test HAVE_CXX_WNO_MISSING_PROTOTYPES - Failed
-- Performing Test HAVE_CXX_WNO_UNUSED_PARAMETER
-- Performing Test HAVE_CXX_WNO_UNUSED_PARAMETER - Success
-- Performing Test HAVE_CXX_WNO_UNUSED_LOCAL_TYPEDEFS
-- Performing Test HAVE_CXX_WNO_UNUSED_LOCAL_TYPEDEFS - Success
-- Performing Test HAVE_CXX_WNO_SIGN_PROMO
-- Performing Test HAVE_CXX_WNO_SIGN_PROMO - Success
-- Performing Test HAVE_CXX_WNO_TAUTOLOGICAL_UNDEFINED_COMPARE
-- Performing Test HAVE_CXX_WNO_TAUTOLOGICAL_UNDEFINED_COMPARE - Failed
-- Performing Test HAVE_CXX_WNO_IGNORED_QUALIFIERS
-- Performing Test HAVE_CXX_WNO_IGNORED_QUALIFIERS - Success
-- Performing Test HAVE_CXX_WNO_UNUSED_FUNCTION
-- Performing Test HAVE_CXX_WNO_UNUSED_FUNCTION - Success
-- Performing Test HAVE_CXX_WNO_UNUSED_CONST_VARIABLE
-- Performing Test HAVE_CXX_WNO_UNUSED_CONST_VARIABLE - Success
-- Performing Test HAVE_CXX_WNO_SHORTEN_64_TO_32
-- Performing Test HAVE_CXX_WNO_SHORTEN_64_TO_32 - Failed
-- Performing Test HAVE_CXX_WNO_INVALID_OFFSETOF
-- Performing Test HAVE_CXX_WNO_INVALID_OFFSETOF - Success
-- Performing Test HAVE_CXX_WNO_ENUM_COMPARE_SWITCH
-- Performing Test HAVE_CXX_WNO_ENUM_COMPARE_SWITCH - Failed
-- Could NOT find JNI (missing: JAVA_INCLUDE_PATH JAVA_INCLUDE_PATH2 JAVA_AWT_INCLUDE_PATH)
-- Found Pylint: /home/deep/anaconda3/bin/pylint 
-- Could NOT find Flake8 (missing: FLAKE8_EXECUTABLE)
-- VTK is not found. Please set -DVTK_DIR in CMake to VTK build directory, or to VTK install subdirectory with VTKConfig.cmake file
-- Looking for dlerror in dl
-- Looking for dlerror in dl - found
-- Performing Test HAVE_C_WNO_UNDEF
-- Performing Test HAVE_C_WNO_UNDEF - Success
-- ADE: Download: v0.1.1d.zip
-- OpenCV Python: during development append to PYTHONPATH: /home/deep/opencv/opencv-4.1.0/build/python_loader
-- Found PkgConfig: /usr/bin/pkg-config (found version "0.29.1")
-- Caffe:   NO
-- Protobuf:   NO
-- Glog:   NO
-- Performing Test HAVE_CXX_WNO_UNUSED_VARIABLE
-- Performing Test HAVE_CXX_WNO_UNUSED_VARIABLE - Success
-- Performing Test HAVE_CXX_WNO_ENUM_COMPARE
-- Performing Test HAVE_CXX_WNO_ENUM_COMPARE - Success
-- Checking for module 'freetype2'
--   Found freetype2, version 21.0.15
-- Checking for module 'harfbuzz'
--   Found harfbuzz, version 1.7.2
-- freetype2:   YES (ver 21.0.15)
-- harfbuzz:    YES (ver 1.7.2)
-- HDF5: Using hdf5 compiler wrapper to determine C configuration
-- Found HDF5: /home/deep/anaconda3/lib/libhdf5.so;/usr/lib/x86_64-linux-gnu/librt.so;/usr/lib/x86_64-linux-gnu/libpthread.so;/home/deep/anaconda3/lib/libz.so;/usr/lib/x86_64-linux-gnu/libdl.so;/usr/lib/x86_64-linux-gnu/libm.so (found version "1.10.4") 
-- Module opencv_ovis disabled because OGRE3D was not found
-- No preference for use of exported gflags CMake configuration set, and no hints for include/library directories provided. Defaulting to preferring an installed/exported gflags CMake configuration if available.
-- Failed to find installed gflags CMake configuration, searching for gflags build directories exported with CMake.
-- Failed to find gflags - Failed to find an installed/exported CMake configuration for gflags, will perform search for installed gflags components.
-- Failed to find gflags - Could not find gflags include directory, set GFLAGS_INCLUDE_DIR to directory containing gflags/gflags.h
-- Failed to find glog - Could not find glog include directory, set GLOG_INCLUDE_DIR to directory containing glog/logging.h
-- Module opencv_sfm disabled because the following dependencies are not found: Eigen Glog/Gflags
-- Performing Test HAVE_CXX_WNO_UNUSED_BUT_SET_VARIABLE
-- Performing Test HAVE_CXX_WNO_UNUSED_BUT_SET_VARIABLE - Success
-- HDF5: Using hdf5 compiler wrapper to determine C configuration
-- Performing Test HAVE_CXX_WNO_OVERLOADED_VIRTUAL
-- Performing Test HAVE_CXX_WNO_OVERLOADED_VIRTUAL - Success
-- Checking for module 'tesseract'
--   No package 'tesseract' found
-- Tesseract:   NO
-- xfeatures2d/boostdesc: Download: boostdesc_bgm.i
-- xfeatures2d/boostdesc: Download: boostdesc_bgm_bi.i
-- xfeatures2d/boostdesc: Download: boostdesc_bgm_hd.i
-- xfeatures2d/boostdesc: Download: boostdesc_binboost_064.i
-- xfeatures2d/boostdesc: Download: boostdesc_binboost_128.i
-- xfeatures2d/boostdesc: Download: boostdesc_binboost_256.i
-- xfeatures2d/boostdesc: Download: boostdesc_lbgm.i
-- xfeatures2d/vgg: Download: vgg_generated_48.i
-- xfeatures2d/vgg: Download: vgg_generated_64.i
-- xfeatures2d/vgg: Download: vgg_generated_80.i
-- xfeatures2d/vgg: Download: vgg_generated_120.i
-- data: Download: face_landmark_model.dat
-- OpenCL samples are skipped: OpenCL SDK is required
-- Pylint: registered 169 targets. Build 'check_pylint' target to run checks ("cmake --build . --target check_pylint" or "make check_pylint")
--
-- General configuration for OpenCV 4.1.0 =====================================
--   Version control:               unknown
--
--   Extra modules:
--     Location (extra):            /home/deep/opencv/opencv_contrib/modules
--     Version control (extra):     4.1.0-67-g297e8be9
--
--   Platform:
--     Timestamp:                   2019-07-22T10:23:57Z
--     Host:                        Linux 4.18.0-25-generic x86_64
--     CMake:                       3.10.2
--     CMake generator:             Unix Makefiles
--     CMake build tool:            /usr/bin/make
--     Configuration:               RELEASE
--
--   CPU/HW features:
--     Baseline:                    SSE SSE2 SSE3
--       requested:                 SSE3
--     Dispatched code generation:  SSE4_1 SSE4_2 FP16 AVX AVX2 AVX512_SKX
--       requested:                 SSE4_1 SSE4_2 AVX FP16 AVX2 AVX512_SKX
--       SSE4_1 (15 files):         + SSSE3 SSE4_1
--       SSE4_2 (2 files):          + SSSE3 SSE4_1 POPCNT SSE4_2
--       FP16 (1 files):            + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 AVX
--       AVX (5 files):             + SSSE3 SSE4_1 POPCNT SSE4_2 AVX
--       AVX2 (29 files):           + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2
--       AVX512_SKX (2 files):      + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2 AVX_512F AVX512_SKX
--
--   C/C++:
--     Built as dynamic libs?:      YES
--     C++ Compiler:                /usr/bin/c++  (ver 7.4.0)
--     C++ flags (Release):         -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG  -DNDEBUG
--     C++ flags (Debug):           -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -g  -O0 -DDEBUG -D_DEBUG
--     C Compiler:                  /usr/bin/cc
--     C flags (Release):           -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -O3 -DNDEBUG  -DNDEBUG
--     C flags (Debug):             -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -g  -O0 -DDEBUG -D_DEBUG
--     Linker flags (Release):      -Wl,--gc-sections 
--     Linker flags (Debug):        -Wl,--gc-sections 
--     ccache:                      NO
--     Precompiled headers:         YES
--     Extra dependencies:          m pthread /usr/lib/x86_64-linux-gnu/libGL.so /usr/lib/x86_64-linux-gnu/libGLU.so cudart_static -lpthread dl rt nppc nppial nppicc nppicom nppidei nppif nppig nppim nppist nppisu nppitc npps cublas cufft -L/usr/local/cuda-10.1/lib64 -L/usr/lib/x86_64-linux-gnu
--     3rdparty dependencies:
--
--   OpenCV modules:
--     To be built:                 aruco bgsegm bioinspired calib3d ccalib core cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev cvv datasets dnn dnn_objdetect dpm face features2d flann freetype fuzzy gapi hdf hfs highgui img_hash imgcodecs imgproc line_descriptor ml objdetect optflow phase_unwrapping photo plot quality reg rgbd saliency shape stereo stitching structured_light superres surface_matching text tracking ts video videoio videostab xfeatures2d ximgproc xobjdetect xphoto
--     Disabled:                    world
--     Disabled by dependency:      -
--     Unavailable:                 cnn_3dobj java js matlab ovis python2 python3 sfm viz
--     Applications:                tests perf_tests examples apps
--     Documentation:               NO
--     Non-free algorithms:         NO
--
--   GUI:
--     QT:                          YES (ver 5.9.7)
--       QT OpenGL support:         YES (Qt5::OpenGL 5.9.7)
--     GTK+:                        NO
--     OpenGL support:              YES (/usr/lib/x86_64-linux-gnu/libGL.so /usr/lib/x86_64-linux-gnu/libGLU.so)
--     VTK support:                 NO
--
--   Media I/O:
--     ZLib:                        /usr/lib/x86_64-linux-gnu/libz.so (ver 1.2.11)
--     JPEG:                        /usr/lib/x86_64-linux-gnu/libjpeg.so (ver 80)
--     WEBP:                        build (ver encoder: 0x020e)
--     PNG:                         /usr/lib/x86_64-linux-gnu/libpng.so (ver 1.6.34)
--     TIFF:                        /usr/lib/x86_64-linux-gnu/libtiff.so (ver 42 / 4.0.9)
--     JPEG 2000:                   build (ver 1.900.1)
--     OpenEXR:                     build (ver 1.7.1)
--     HDR:                         YES
--     SUNRASTER:                   YES
--     PXM:                         YES
--     PFM:                         YES
--
--   Video I/O:
--     DC1394:                      YES (2.2.5)
--     FFMPEG:                      YES
--       avcodec:                   YES (57.107.100)
--       avformat:                  YES (57.83.100)
--       avutil:                    YES (55.78.100)
--       swscale:                   YES (4.8.100)
--       avresample:                YES (3.7.0)
--     GStreamer:                   YES (1.14.4)
--     v4l/v4l2:                    YES (linux/videodev2.h)
--
--   Parallel framework:            TBB (ver 2017.0 interface 9107)
--
--   Trace:                         YES (with Intel ITT)
--
--   Other third-party libraries:
--     Intel IPP:                   2019.0.0 Gold [2019.0.0]
--            at:                   /home/deep/opencv/opencv-4.1.0/build/3rdparty/ippicv/ippicv_lnx/icv
--     Intel IPP IW:                sources (2019.0.0)
--               at:                /home/deep/opencv/opencv-4.1.0/build/3rdparty/ippicv/ippicv_lnx/iw
--     Lapack:                      NO
--     Eigen:                       NO
--     Custom HAL:                  NO
--     Protobuf:                    build (3.5.1)
--
--   NVIDIA CUDA:                   YES (ver 10.1, CUFFT CUBLAS NVCUVID)
--     NVIDIA GPU arch:             30 35 37 50 52 60 61 70 75
--     NVIDIA PTX archs:
--
--   OpenCL:                        YES (no extra features)
--     Include path:                /home/deep/opencv/opencv-4.1.0/3rdparty/include/opencl/1.2
--     Link libraries:              Dynamic load
--
--   Python (for build):            /usr/bin/python2.7
--     Pylint:                      /home/deep/anaconda3/bin/pylint (ver: 3.7.3, checks: 169)
--
--   Java:                         
--     ant:                         NO
--     JNI:                         NO
--     Java wrappers:               NO
--     Java tests:                  NO
--
--   Install to:                    /home/deep/opencv/opencv-4.1.0/build/installation/OpenCV-4.1.0
-- -----------------------------------------------------------------
--
-- Configuring done
-- Generating done
-- Build files have been written to: /home/deep/opencv/opencv-4.1.0/build
(base) deep@TSP339:~/opencv/opencv-4.1.0/build$


After compilation, we need to run make again to define the maximum number of threads. This is best when matching the actual numbers of cores on the CPU.
This can be determined running the command "nproc" from root.

On my Intel i7 6 cores with hyperthreading, executing nproc gives:
#nproc
12


The following command performs final activities, links the whole and prepares for installation in target directory (as specified in CMAKE_INSTALL_PREFIX=)


$make -j12

Now we are ready for installation. This step has to be performed from root.
When executing sudo bash from a specific conda environment, it goes back to (base). This means that the install command is run from outside the current conda environment. I am not sure this is ok.


#make install


[...]
Scanning dependencies of target opencv_test_cudev
[ 18%] Building CXX object modules/cudev/test/CMakeFiles/opencv_test_cudev.dir/test_main.cpp.o
[ 18%] Linking CXX executable ../../../bin/opencv_test_cudev
../../../lib/libopencv_imgcodecs.so.4.1.0: undefined reference to `TIFFReadRGBAStrip@LIBTIFF_4.0'
../../../lib/libopencv_imgcodecs.so.4.1.0: undefined reference to `TIFFReadDirectory@LIBTIFF_4.0'
../../../lib/libopencv_imgcodecs.so.4.1.0: undefined reference to `TIFFWriteEncodedStrip@LIBTIFF_4.0'
../../../lib/libopencv_imgcodecs.so.4.1.0: undefined reference to `TIFFIsTiled@LIBTIFF_4.0'
../../../lib/libopencv_imgcodecs.so.4.1.0: undefined reference to `TIFFWriteScanline@LIBTIFF_4.0'
../../../lib/libopencv_imgcodecs.so.4.1.0: undefined reference to `TIFFGetField@LIBTIFF_4.0'
../../../lib/libopencv_imgcodecs.so.4.1.0: undefined reference to `TIFFScanlineSize@LIBTIFF_4.0'
../../../lib/libopencv_imgcodecs.so.4.1.0: undefined reference to `TIFFWriteDirectory@LIBTIFF_4.0'
../../../lib/libopencv_imgcodecs.so.4.1.0: undefined reference to `TIFFReadEncodedTile@LIBTIFF_4.0'
../../../lib/libopencv_imgcodecs.so.4.1.0: undefined reference to `TIFFReadRGBATile@LIBTIFF_4.0'
../../../lib/libopencv_imgcodecs.so.4.1.0: undefined reference to `TIFFClose@LIBTIFF_4.0'
../../../lib/libopencv_imgcodecs.so.4.1.0: undefined reference to `TIFFClientOpen@LIBTIFF_4.0'
../../../lib/libopencv_imgcodecs.so.4.1.0: undefined reference to `TIFFRGBAImageOK@LIBTIFF_4.0'
../../../lib/libopencv_imgcodecs.so.4.1.0: undefined reference to `TIFFOpen@LIBTIFF_4.0'
../../../lib/libopencv_imgcodecs.so.4.1.0: undefined reference to `TIFFReadEncodedStrip@LIBTIFF_4.0'
../../../lib/libopencv_imgcodecs.so.4.1.0: undefined reference to `TIFFSetField@LIBTIFF_4.0'
../../../lib/libopencv_imgcodecs.so.4.1.0: undefined reference to `TIFFSetWarningHandler@LIBTIFF_4.0'
../../../lib/libopencv_imgcodecs.so.4.1.0: undefined reference to `TIFFSetErrorHandler@LIBTIFF_4.0'
collect2: error: ld returned 1 exit status
modules/cudev/test/CMakeFiles/opencv_test_cudev.dir/build.make:242: recipe for target 'bin/opencv_test_cudev' failed
make[2]: *** [bin/opencv_test_cudev] Error 1
CMakeFiles/Makefile2:2777: recipe for target 'modules/cudev/test/CMakeFiles/opencv_test_cudev.dir/all' failed
make[1]: *** [modules/cudev/test/CMakeFiles/opencv_test_cudev.dir/all] Error 2
Makefile:162: recipe for target 'all' failed
make: *** [all] Error 2
(base) deep@TSP339:~/opencv/opencv-4.1.0/build$