Data Transfer Tools for C++ Linear Algebra Libraries.

dtt is a lightweight, header-only C++ library designed to seamlessly transfer matrix and array data between major linear-algebra libraries. It supports Eigen, Armadillo, OpenCV (cv::Mat), ArrayFire, and LibTorch (PyTorch C++), offering simple one-call conversion functions in every direction (e.g., eigen2arma, cv2af, libtorch2eigen, etc.). The library requires only C++17 and no build step—just include dtt.h. It’s primarily a convenience layer that removes the need for manual data-format juggling when working across heterogeneous numerical libraries, and includes tests and example usage in the test/ directory.

Currently, it supports data transfer between the following libraries:

• Eigen (>=3.3.x)
• Armadillo (>=9.x)
• OpenCV (cv::Mat) (2.x, 3.x, 4.x)
• ArrayFire (>=3.x)
• LibTorch (PyTorch C++) (>=1.x)

Current status:

Last page update: 25/08/2019

From/To	Eigen	Armadillo	OpenCV	ArrayFire	LibTorch
Eigen	-	X	X	X	X
Armadillo	X	-	X	X	X
OpenCV	X	X	-	X	X
ArrayFire	X	X	X	-	X
LibTorch	X	X	X	X	-

Tested on:

• MacBook Pro (13-inch, 2017)
• Mac OS X Mojave (10.14.5), Clang 10 (clang-1000.11.45.5), Xcode 10.1 with the following libraries:
• • OpenCV 4.1.1 (stable, built from source)
• • Eigen 3.3.7 (stable)
• • Armadillo 9.600.5 (stable)
• • ArrayFire 3.6.4 (stable)
• • LibTorch (1.3.0.dev20190820)

Install dependencies:

brew install eigen
brew install armadillo
# download and install ArrayFire: https://arrayfire.com/download/
# download and install LibTorch: https://pytorch.org/get-started/locally/
# download adn install OpenCV: https://opencv.org/releases/

How to compile and run:

git clone https://github.com/andrewssobral/dtt.git
cd dtt && mkdir build && cd build
cmake -DCMAKE_PREFIX_PATH=$LIBTORCH_HOME ..
./dtt_test

How to use:

cCopy
#include <dtt.h>
using namespace dtt;
// that's all!

List of available functions:

• From Eigen:

• • eigen2arma
• • eigen2cv
• • eigen2af
• • eigen2libtorch

• From Armadillo:

• • arma2eigen
• • arma2cv
• • arma2af
• • arma2libtorch

• From OpenCV:

• • cv2eigen
• • cv2arma
• • cv2af
• • cv2libtorch

• From ArrayFire:

• • af2eigen
• • af2arma
• • af2cv
• • af2libtorch

• From LibTorch:

• • libtorch2eigen
• • libtorch2arma
• • libtorch2cv
• • libtorch2af

See test/dtt_test.h and test/dtt_test.cpp for usage examples.