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Build OpenVINO™ Inference Engine

Contents

Introduction

The Inference Engine can infer models in different formats with various input and output formats.

The open source version of Inference Engine includes the following plugins:

PLUGIN DEVICE TYPES
CPU plugin Intel® Xeon® with Intel® AVX2 and AVX512, Intel® Core™ Processors with Intel® AVX2, Intel® Atom® Processors with Intel® SSE
GPU plugin Intel® Processor Graphics, including Intel® HD Graphics and Intel® Iris® Graphics
GNA plugin Intel® Speech Enabling Developer Kit, Amazon Alexa* Premium Far-Field Developer Kit, Intel® Pentium® Silver processor J5005, Intel® Celeron® processor J4005, Intel® Core™ i3-8121U processor
MYRIAD plugin Intel® Movidius™ Neural Compute Stick powered by the Intel® Movidius™ Myriad™ 2, Intel® Neural Compute Stick 2 powered by the Intel® Movidius™ Myriad™ X
Heterogeneous plugin Heterogeneous plugin enables computing for inference on one network on several Intel® devices.

Inference Engine plugin for Intel® FPGA is distributed only in a binary form, as a part of Intel® Distribution of OpenVINO™.

Build on Linux* Systems

The software was validated on:

  • Ubuntu* 18.04 (64-bit) with default GCC* 7.5.0
  • Ubuntu* 20.04 (64-bit) with default GCC* 9.3.0
  • CentOS* 7.6 (64-bit) with default GCC* 4.8.5

Software Requirements

NOTE: Building samples and demos from the Intel® Distribution of OpenVINO™ toolkit package requires CMake* 3.10 or higher.

Build Steps

  1. Clone submodules: 
    cd openvino
git submodule update --init --recursive
  2. Install build dependencies using the install_dependencies.sh script in the project root folder. 
    chmod +x install_dependencies.sh
    ./install_dependencies.sh
  3. By default, the build enables the Inference Engine GPU plugin to infer models on your Intel® Processor Graphics. This requires you to Install Intel® Graphics Compute Runtime for OpenCL™ Driver package 19.41.14441 before running the build. If you don't want to use the GPU plugin, use the -DENABLE_CLDNN=OFF CMake build option and skip the installation of the Intel® Graphics Compute Runtime for OpenCL™ Driver.
  4. Create a build folder:
  mkdir build && cd build
  1. Inference Engine uses a CMake-based build system. In the created build directory, run cmake to fetch project dependencies and create Unix makefiles, then run make to build the project:
  cmake -DCMAKE_BUILD_TYPE=Release ..
  make --jobs=$(nproc --all)

Additional Build Options

You can use the following additional build options:

  • The default build uses an internal JIT GEMM implementation.

  • To switch to an OpenBLAS* implementation, use the GEMM=OPENBLAS option with BLAS_INCLUDE_DIRS and BLAS_LIBRARIES CMake options to specify a path to the OpenBLAS headers and library. For example, the following options on CentOS*: -DGEMM=OPENBLAS -DBLAS_INCLUDE_DIRS=/usr/include/openblas -DBLAS_LIBRARIES=/usr/lib64/libopenblas.so.0.

  • To switch to the optimized MKL-ML* GEMM implementation, use -DGEMM=MKL and -DMKLROOT=<path_to_MKL> CMake options to specify a path to unpacked MKL-ML with the include and lib folders. MKL-ML* package can be downloaded from the Intel® MKL-DNN repository.

  • Threading Building Blocks (TBB) is used by default. To build the Inference Engine with OpenMP* threading, set the -DTHREADING=OMP option.

  • Required versions of TBB and OpenCV packages are downloaded automatically by the CMake-based script. If you want to use the automatically downloaded packages but you already have installed TBB or OpenCV packages configured in your environment, you may need to clean the TBBROOT and OpenCV_DIR environment variables before running the cmake command, otherwise they will not be downloaded and the build may fail if incompatible versions were installed.

  • If the CMake-based build script can not find and download the OpenCV package that is supported on your platform, or if you want to use a custom build of the OpenCV library, refer to the Use Custom OpenCV Builds section for details.

  • To build the Python API wrapper:

    1. Install all additional packages listed in the /inference-engine/ie_bridges/python/requirements.txt file: 
      pip install -r requirements.txt
    2. Use the -DENABLE_PYTHON=ON option. To specify an exact Python version, use the following options: 
      -DPYTHON_EXECUTABLE=`which python3.7` \
-DPYTHON_LIBRARY=/usr/lib/x86_64-linux-gnu/libpython3.7m.so \
-DPYTHON_INCLUDE_DIR=/usr/include/python3.7

  • To switch the CPU and GPU plugins off/on, use the cmake options -DENABLE_MKL_DNN=ON/OFF and -DENABLE_CLDNN=ON/OFF respectively.

  • nGraph-specific compilation options: -DNGRAPH_ONNX_IMPORT_ENABLE=ON enables the building of the nGraph ONNX importer. -DNGRAPH_DEBUG_ENABLE=ON enables additional debug prints.

Build for Raspbian Stretch* OS

NOTE: Only the MYRIAD plugin is supported.

Hardware Requirements

  • Raspberry Pi* 2 or 3 with Raspbian* Stretch OS (32-bit). Check that it's CPU supports ARMv7 instruction set (uname -m command returns armv7l).

    NOTE: Despite the Raspberry Pi* CPU is ARMv8, 32-bit OS detects ARMv7 CPU instruction set. The default gcc compiler applies ARMv6 architecture flag for compatibility with lower versions of boards. For more information, run the gcc -Q --help=target command and refer to the description of the -march= option.

You can compile the Inference Engine for Raspberry Pi* in one of the two ways:

Native Compilation

Native compilation of the Inference Engine is the most straightforward solution. However, it might take at least one hour to complete on Raspberry Pi* 3.

  1. Install dependencies:
sudo apt-get update
sudo apt-get install -y git cmake libusb-1.0-0-dev
  1. Go to the cloned openvino repository:
cd openvino
  1. Initialize submodules:
git submodule update --init --recursive
  1. Create a build folder:
mkdir build && cd build
  1. Build the Inference Engine:
cmake -DCMAKE_BUILD_TYPE=Release \
      -DENABLE_SSE42=OFF \
      -DTHREADING=SEQ \
      -DENABLE_GNA=OFF .. && make

Cross Compilation Using Docker*

This compilation was tested on the following configuration:

  • Host: Ubuntu* 18.04 (64-bit, Intel® Core™ i7-6700K CPU @ 4.00GHz × 8)
  • Target: Raspbian* Stretch (32-bit, ARMv7, Raspberry Pi* 3)
  1. Install Docker*:
sudo apt-get install -y docker.io
  1. Add a current user to docker group:
sudo usermod -a -G docker $USER

Log out and log in for this to take effect.

  1. Create a directory named ie_cross_armhf and add a text file named Dockerfile with the following content:
FROM debian:stretch

USER root

RUN dpkg --add-architecture armhf && \
    apt-get update && \
    apt-get install -y --no-install-recommends \
    build-essential \
    crossbuild-essential-armhf \
    git \
    wget \
    libusb-1.0-0-dev:armhf \
    libgtk-3-dev:armhf \
    libavcodec-dev:armhf \
    libavformat-dev:armhf \
    libswscale-dev:armhf \
    libgstreamer1.0-dev:armhf \
    libgstreamer-plugins-base1.0-dev:armhf \
    libpython3-dev:armhf \
    python3-pip \
    python-minimal \
    python-argparse

RUN wget https://www.cmake.org/files/v3.14/cmake-3.14.3.tar.gz && \
    tar xf cmake-3.14.3.tar.gz && \
    (cd cmake-3.14.3 && ./bootstrap --parallel=$(nproc --all) && make --jobs=$(nproc --all) && make install) && \
    rm -rf cmake-3.14.3 cmake-3.14.3.tar.gz

It uses the Debian* Stretch (Debian 9) OS for compilation because it is a base of the Raspbian* Stretch.

  1. Build a Docker* image:
docker image build -t ie_cross_armhf ie_cross_armhf
  1. Run Docker* container with mounted source code folder from host:
docker run -it -v /absolute/path/to/openvino:/openvino ie_cross_armhf /bin/bash

  1. While in the container:

    1. Go to the cloned openvino repository:
    cd openvino
    1. Create a build folder:
    mkdir build && cd build
    1. Build the Inference Engine:
    cmake -DCMAKE_BUILD_TYPE=Release \
    -DCMAKE_TOOLCHAIN_FILE="../cmake/arm.toolchain.cmake" \
    -DTHREADS_PTHREAD_ARG="-pthread" \
    -DENABLE_SSE42=OFF \
    -DTHREADING=SEQ \
    -DENABLE_GNA=OFF .. && make --jobs=$(nproc --all)

  2. Press Ctrl+D to exit from Docker. You can find the resulting binaries in the openvino/bin/armv7l/ directory and the OpenCV* installation in the openvino/inference-engine/temp.

NOTE: Native applications that link to cross-compiled Inference Engine library require an extra compilation flag -march=armv7-a.

Additional Build Options

You can use the following additional build options:

  • Required versions of OpenCV packages are downloaded automatically by the CMake-based script. If you want to use the automatically downloaded packages but you already have installed OpenCV packages configured in your environment, you may need to clean the OpenCV_DIR environment variable before running the cmake command; otherwise they won't be downloaded and the build may fail if incompatible versions were installed.

  • If the CMake-based build script cannot find and download the OpenCV package that is supported on your platform, or if you want to use a custom build of the OpenCV library, see: Use Custom OpenCV Builds for details.

  • To build Python API wrapper, install libpython3-dev:armhf and python3-pip packages using apt-get; then install numpy and cython python modules via pip3, adding the following options:

    -DENABLE_PYTHON=ON \
-DPYTHON_EXECUTABLE=/usr/bin/python3.5 \
-DPYTHON_LIBRARY=/usr/lib/arm-linux-gnueabihf/libpython3.5m.so \
-DPYTHON_INCLUDE_DIR=/usr/include/python3.5

  • nGraph-specific compilation options: -DNGRAPH_ONNX_IMPORT_ENABLE=ON enables the building of the nGraph ONNX importer. -DNGRAPH_DEBUG_ENABLE=ON enables additional debug prints.

Build on Windows* Systems

The software was validated on:

  • Microsoft* Windows* 10 (64-bit) with Visual Studio 2019

Software Requirements

  • CMake*3.13 or higher
  • Microsoft* Visual Studio 2017, 2019
  • (Optional) Intel® Graphics Driver for Windows* (26.20) driver package.
  • Python 3.6 or higher for Inference Engine Python API wrapper

NOTE: Building samples and demos from the Intel® Distribution of OpenVINO™ toolkit package requires CMake* 3.10 or higher.

Build Steps

  1. Clone submodules:

    git submodule update --init --recursive

  2. By default, the build enables the Inference Engine GPU plugin to infer models on your Intel® Processor Graphics. This requires you to [download and install the Intel® Graphics Driver for Windows (26.20) driver package before running the build. If you don't want to use the GPU plugin, use the -DENABLE_CLDNN=OFF CMake build option and skip the installation of the Intel® Graphics Driver.

  3. Create build directory:

    mkdir build

  4. In the build directory, run cmake to fetch project dependencies and generate a Visual Studio solution.

    For Microsoft* Visual Studio 2017:

cmake -G "Visual Studio 15 2017 Win64" -DCMAKE_BUILD_TYPE=Release ..

For Microsoft* Visual Studio 2019:

cmake -G "Visual Studio 16 2019" -A x64 -DCMAKE_BUILD_TYPE=Release ..

  1. Build generated solution in Visual Studio or run cmake --build . --config Release to build from the command line.

  2. Before running the samples, add paths to the TBB and OpenCV binaries used for the build to the %PATH% environment variable. By default, TBB binaries are downloaded by the CMake-based script to the <openvino_repo>/inference-engine/temp/tbb/bin folder, OpenCV binaries to the <openvino_repo>/inference-engine/temp/opencv_4.5.0/opencv/bin folder.

Additional Build Options

  • Internal JIT GEMM implementation is used by default.

  • To switch to OpenBLAS GEMM implementation, use the -DGEMM=OPENBLAS CMake option and specify path to OpenBLAS using the -DBLAS_INCLUDE_DIRS=<OPENBLAS_DIR>\include and -DBLAS_LIBRARIES=<OPENBLAS_DIR>\lib\libopenblas.dll.a options. Download a prebuilt OpenBLAS* package via the OpenBLAS link. mingw64* runtime dependencies can be downloaded via the mingw64* runtime dependencies link.

  • To switch to the optimized MKL-ML* GEMM implementation, use the -DGEMM=MKL and -DMKLROOT=<path_to_MKL> CMake options to specify a path to unpacked MKL-ML with the include and lib folders. MKL-ML* package can be downloaded from the Intel® MKL-DNN repository for Windows.

  • Threading Building Blocks (TBB) is used by default. To build the Inference Engine with OpenMP* threading, set the -DTHREADING=OMP option.

  • Required versions of TBB and OpenCV packages are downloaded automatically by the CMake-based script. If you want to use the automatically-downloaded packages but you already have installed TBB or OpenCV packages configured in your environment, you may need to clean the TBBROOT and OpenCV_DIR environment variables before running the cmake command; otherwise they won't be downloaded and the build may fail if incompatible versions were installed.

  • If the CMake-based build script can not find and download the OpenCV package that is supported on your platform, or if you want to use a custom build of the OpenCV library, refer to the Use Custom OpenCV Builds section for details.

  • To switch off/on the CPU and GPU plugins, use the cmake options -DENABLE_MKL_DNN=ON/OFF and -DENABLE_CLDNN=ON/OFF respectively.

  • To build the Python API wrapper, use the -DENABLE_PYTHON=ON option. To specify an exact Python version, use the following options:

    -DPYTHON_EXECUTABLE="C:\Program Files\Python37\python.exe" ^
-DPYTHON_LIBRARY="C:\Program Files\Python37\libs\python37.lib" ^
-DPYTHON_INCLUDE_DIR="C:\Program Files\Python37\include"

  • nGraph-specific compilation options: -DNGRAPH_ONNX_IMPORT_ENABLE=ON enables the building of the nGraph ONNX importer. -DNGRAPH_DEBUG_ENABLE=ON enables additional debug prints.

Building Inference Engine with Ninja* Build System

call "C:\Program Files (x86)\IntelSWTools\compilers_and_libraries_2018\windows\bin\ipsxe-comp-vars.bat" intel64 vs2017
set CXX=icl
set CC=icl
:: clean TBBROOT value set by ipsxe-comp-vars.bat, required TBB package will be downloaded by openvino cmake script
set TBBROOT=
cmake -G Ninja -Wno-dev -DCMAKE_BUILD_TYPE=Release ..
cmake --build . --config Release

Build on macOS* Systems

NOTE: The current version of the OpenVINO™ toolkit for macOS* supports inference on Intel CPUs only.

The software was validated on:

  • macOS* 10.15, 64-bit

Software Requirements

  • CMake* 3.13 or higher
  • Clang* compiler from Xcode* 10.1 or higher
  • Python* 3.6 or higher for the Inference Engine Python API wrapper

NOTE: Building samples and demos from the Intel® Distribution of OpenVINO™ toolkit package requires CMake* 3.10 or higher.

Build Steps

  1. Clone submodules: 
    cd openvino
git submodule update --init --recursive
  2. Create a build folder:
  mkdir build && cd build
  1. Inference Engine uses a CMake-based build system. In the created build directory, run cmake to fetch project dependencies and create Unix makefiles, then run make to build the project:
  cmake -DCMAKE_BUILD_TYPE=Release ..
  make --jobs=$(nproc --all)

Additional Build Options

You can use the following additional build options:

  • Internal JIT GEMM implementation is used by default.

  • To switch to the optimized MKL-ML* GEMM implementation, use -DGEMM=MKL and -DMKLROOT=<path_to_MKL> cmake options to specify a path to unpacked MKL-ML with the include and lib folders. MKL-ML* [package for Mac] can be downloaded here

  • Threading Building Blocks (TBB) is used by default. To build the Inference Engine with OpenMP* threading, set the -DTHREADING=OMP option.

  • Required versions of TBB and OpenCV packages are downloaded automatically by the CMake-based script. If you want to use the automatically downloaded packages but you already have installed TBB or OpenCV packages configured in your environment, you may need to clean the TBBROOT and OpenCV_DIR environment variables before running the cmake command, otherwise they won't be downloaded and the build may fail if incompatible versions were installed.

  • If the CMake-based build script can not find and download the OpenCV package that is supported on your platform, or if you want to use a custom build of the OpenCV library, refer to the Use Custom OpenCV Builds section for details.

  • To build the Python API wrapper, use the -DENABLE_PYTHON=ON option. To specify an exact Python version, use the following options:

    • If you installed Python through Homebrew*, set the following flags:
    -DPYTHON_EXECUTABLE=/usr/local/Cellar/python/3.7.7/Frameworks/Python.framework/Versions/3.7/bin/python3.7m \
-DPYTHON_LIBRARY=/usr/local/Cellar/python/3.7.7/Frameworks/Python.framework/Versions/3.7/lib/libpython3.7m.dylib \
-DPYTHON_INCLUDE_DIR=/usr/local/Cellar/python/3.7.7/Frameworks/Python.framework/Versions/3.7/include/python3.7m
    • If you installed Python another way, you can use the following commands to find where the dylib and include_dir are located, respectively:
    find /usr/ -name 'libpython*m.dylib'
find /usr/ -type d -name python3.7m

  • nGraph-specific compilation options: -DNGRAPH_ONNX_IMPORT_ENABLE=ON enables the building of the nGraph ONNX importer. -DNGRAPH_DEBUG_ENABLE=ON enables additional debug prints.

Build on Android* Systems

This section describes how to build Inference Engine for Android x86 (64-bit) operating systems.

Software Requirements

  • CMake* 3.13 or higher
  • Android NDK (this guide has been validated with r20 release)

NOTE: Building samples and demos from the Intel® Distribution of OpenVINO™ toolkit package requires CMake* 3.10 or higher.

Build Steps

  1. Download and unpack Android NDK: https://developer.android.com/ndk/downloads. Let's assume that ~/Downloads is used as a working folder.
cd ~/Downloads
wget https://dl.google.com/android/repository/android-ndk-r20-linux-x86_64.zip

unzip android-ndk-r20-linux-x86_64.zip
mv android-ndk-r20 android-ndk
  1. Clone submodules
cd openvino
git submodule update --init --recursive
  1. Create a build folder:
  mkdir build
  1. Change working directory to build and run cmake to create makefiles. Then run make.
cd build

cmake .. \
  -DCMAKE_TOOLCHAIN_FILE=~/Downloads/android-ndk/build/cmake/android.toolchain.cmake \
  -DANDROID_ABI=x86_64 \
  -DANDROID_PLATFORM=21 \
  -DANDROID_STL=c++_shared \
  -DENABLE_OPENCV=OFF

make --jobs=$(nproc --all)
  • ANDROID_ABI specifies target architecture (x86_64)
  • ANDROID_PLATFORM - Android API version
  • ANDROID_STL specifies that shared C++ runtime is used. Copy ~/Downloads/android-ndk/sources/cxx-stl/llvm-libc++/libs/x86_64/libc++_shared.so from Android NDK along with built binaries

Use Custom OpenCV Builds for Inference Engine

NOTE: The recommended and tested version of OpenCV is 4.4.0.

Required versions of OpenCV packages are downloaded automatically during the building Inference Engine library. If the build script can not find and download the OpenCV package that is supported on your platform, you can use one of the following options:

  • Download the most suitable version from the list of available pre-build packages from https://download.01.org/opencv/2020/openvinotoolkit from the <release_version>/inference_engine directory.

  • Use a system-provided OpenCV package (e.g with running the apt install libopencv-dev command). The following modules must be enabled: imgcodecs, videoio, highgui.

  • Get the OpenCV package using a package manager: pip, conda, conan etc. The package must have the development components included (header files and CMake scripts).

  • Build OpenCV from source using the build instructions on the OpenCV site.

After you got the built OpenCV library, perform the following preparation steps before running the Inference Engine build:

  1. Set the OpenCV_DIR environment variable to the directory where the OpenCVConfig.cmake file of you custom OpenCV build is located.
  2. Disable the package automatic downloading with using the -DENABLE_OPENCV=OFF option for CMake-based build script for Inference Engine.

Add Inference Engine to Your Project

For CMake projects, set the InferenceEngine_DIR environment variable:

export InferenceEngine_DIR=/path/to/openvino/build/

Then you can find Inference Engine by find_package:

find_package(InferenceEngine)
include_directories(${InferenceEngine_INCLUDE_DIRS})
target_link_libraries(${PROJECT_NAME} ${InferenceEngine_LIBRARIES} dl)

(Optional) Additional Installation Steps for the Intel® Movidius™ Neural Compute Stick and Neural Compute Stick 2

NOTE: These steps are only required if you want to perform inference on Intel® Movidius™ Neural Compute Stick or the Intel® Neural Compute Stick 2 using the Inference Engine MYRIAD Plugin. See also Intel® Neural Compute Stick 2 Get Started.

For Linux, Raspbian* Stretch OS

  1. Add the current Linux user to the users group; you will need to log out and log in for it to take effect:
sudo usermod -a -G users "$(whoami)"
  1. To perform inference on Intel® Movidius™ Neural Compute Stick and Intel® Neural Compute Stick 2, install the USB rules as follows:
cat <<EOF > 97-myriad-usbboot.rules
SUBSYSTEM=="usb", ATTRS{idProduct}=="2150", ATTRS{idVendor}=="03e7", GROUP="users", MODE="0666", ENV{ID_MM_DEVICE_IGNORE}="1"
SUBSYSTEM=="usb", ATTRS{idProduct}=="2485", ATTRS{idVendor}=="03e7", GROUP="users", MODE="0666", ENV{ID_MM_DEVICE_IGNORE}="1"
SUBSYSTEM=="usb", ATTRS{idProduct}=="f63b", ATTRS{idVendor}=="03e7", GROUP="users", MODE="0666", ENV{ID_MM_DEVICE_IGNORE}="1"
EOF
sudo cp 97-myriad-usbboot.rules /etc/udev/rules.d/
sudo udevadm control --reload-rules
sudo udevadm trigger
sudo ldconfig
rm 97-myriad-usbboot.rules

Next Steps

Congratulations, you have built the Inference Engine. To get started with the OpenVINO™, proceed to the Get Started guides:

Notice

To enable some additional nGraph features and use your custom nGraph library with the OpenVINO™ binary package, make sure the following:

  • nGraph library was built with the same version which is used in the Inference Engine.
  • nGraph library and the Inference Engine were built with the same compilers. Otherwise you might face application binary interface (ABI) problems.

To prepare your custom nGraph library for distribution, which includes collecting all headers, copy binaries, and so on, use the install CMake target. This target collects all dependencies, prepares the nGraph package and copies it to a separate directory.

Additional Resources

* Other names and brands may be claimed as the property of others.