Acoustic Odometry

A standalone C++ library with dependencies managed by vcpkg accessible through Python using pybind11.

Example usage

Create a clean Python virtual environment

python -m venv venv

Activate it on Windows

.\venv\Scripts\activate

otherwise

source ./venv/bin/activate

Install this project

pip install git+https://github.com/AcousticOdometry/AO.git

or

pip install git+ssh://git@github.com/AcousticOdometry/AO.git

It will take a while to build as it will build the C++ dependencies as well, but it will work. It is definitely not the most optimal way of installing a package as we are installing as well the vcpkg package manager and building from source dependencies that might as well be installed on the system. But this allows a fast development environment where adding or removing C++ dependencies should be easy.

Test that the C++ code is working in the Python package

TODO

Setup

Install the requirements

Install vcpkg requirements with the addition of cmake and Python. It could be summarized as:

• git
• Build tools (Visual Studio on Windows or gcc on Linux for example)
• cmake
• Python. Make sure to have development tools installed (python3.X-dev on Linux, being X your version of Python).

If running on a clean linux environment (like a container or Windows Subsystem for Linux) you will need to install some additional tools as it is stated in vcpkg.

sudo apt-get install build-essential curl zip unzip tar pkg-config libssl-dev python3-dev

This library is additionally based on modern C++17 with some C++20 features. Therefore it requires a C++ compiler that supports C++20. In linux, gcc version 11 is recommended. Fortunately, several versions of gcc can co-live together.

sudo apt install software-properties-common
sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt update
sudo apt install gcc-11 g++-11
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-11 110 \
    --slave /usr/bin/g++ g++ /usr/bin/g++-11

Git Large File System

Needed for the model files

https://git-lfs.github.com/

CMake

Follow the official instructions.

The required cmake version is quite high, if you are using a Linux distribution and installing cmake from the repositories take into account that they might not be updated to the latest version. However there are options to install the latest version of cmake from the command line.

Make sure that when you run cmake --version the output is 3.21 or higher. The reason for this is that we are using some of the 3.21 features to install runtime dependencies (managed with vcpkg) together with our project so they are available to Python when using its API.

Clone this repository with vcpkg

Cone this repository with vcpkg as a submodule and navigate into it.

git clone --recursive git@github.com:esdandreu/python-extension-cpp.git
cd python-extension-cpp

Bootstrap vcpkg in Windows. Make sure you have installed the prerequisites.

.\vcpkg\bootstrap-vcpkg.bat

Or in Linux/MacOS. Make sure you have installed developer tools

./vcpkg/bootstrap-vcpkg.sh

Building

Build locally with CMake

Navigate to the root of the repository and create a build directory.

mkdir build

Configure cmake to use vcpkg.

cmake -B build -S . -DCMAKE_TOOLCHAIN_FILE="$pwd/vcpkg/scripts/buildsystems/vcpkg.cmake"

Build the project.

cmake --build build

Build locally with Python

It is recommended to use a clean virtual environment.

scikit-build is required before running the installer, as it is the package that takes care of the installation. The rest of dependencies will be installed automatically.

pip install scikit-build

Install the repository. By adding [test] to our install command we can install additionally the test dependencies.

pip install .[test]

Testing

Test the C++ library with Google Test

ctest --test-dir build/tests

Test the python extension

pytest

Development

We try to use the following style guide for pybind11 https://developer.lsst.io/pybind11/style.html

Mount Google Drive in Windows Subsystem for Linux

sudo mount -t drvfs G: /mnt/g