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dlpack Python support for cuda_GpuMat and cuda_GpuMatND #27581

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@dkurt dkurt commented Jul 26, 2025 •
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Pull Request Readiness Checklist

resolves #16295

force_builders=Custom
buildworker:Custom=linux-4
build_image:Custom=ubuntu-cuda11:18.04
Xbuild_image:Custom=ubuntu-cuda11:18.04

docker run --gpus 0 -v ~/opencv:/opencv -v ~/opencv_contrib:/opencv_contrib -it nvidia/cuda:12.8.1-cudnn-devel-ubuntu22.04
apt-get update && apt-get install -y cmake python3-dev python3-pip python3-venv &&
python3 -m venv .venv &&
source .venv/bin/activate &&
pip install -U pip &&
pip install -U numpy &&
pip install torch --index-url https://download.pytorch.org/whl/cu128 &&
cmake \
    -DWITH_OPENCL=OFF \
    -DCMAKE_BUILD_TYPE=Release \
    -DBUILD_DOCS=OFF \
    -DWITH_CUDA=ON \
    -DOPENCV_DNN_CUDA=ON \
    -DOPENCV_EXTRA_MODULES_PATH=/opencv_contrib/modules \
    -DBUILD_LIST=ts,cudev,python3 \
    -S /opencv -B /opencv_build &&
cmake --build /opencv_build -j16
export PYTHONPATH=/opencv_build/lib/python3/:$PYTHONPATH

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

  • I agree to contribute to the project under Apache 2 License.
  • To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
  • The PR is proposed to the proper branch
  • There is a reference to the original bug report and related work
  • There is accuracy test, performance test and test data in opencv_extra repository, if applicable
    Patch to opencv_extra has the same branch name.
  • The feature is well documented and sample code can be built with the project CMake

@asmorkalov asmorkalov self-requested a review July 28, 2025 05:50
@asmorkalov asmorkalov added this to the 4.13.0 milestone Jul 28, 2025
@asmorkalov asmorkalov added the category: gpu/cuda (contrib) OpenCV 4.0+: moved to opencv_contrib label Jul 28, 2025
@asmorkalov asmorkalov self-assigned this Jul 28, 2025
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DLpack available as deb package on Ubuntu. It'll be great to support external instances via find_package too just i case of compatibility issues.

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cc @cudawarped

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Windows build warnings:

C:/GHA-OCV-2/_work/opencv/opencv/opencv/modules/core/misc/python/pyopencv_cuda.hpp(44): warning C4267: 'argument': conversion from 'size_t' to 'int', possible loss of data

C:/GHA-OCV-2/_work/opencv/opencv/opencv/modules/core/misc/python/pyopencv_cuda.hpp(60): warning C4267: 'argument': conversion from 'size_t' to 'int', possible loss of data

C:/GHA-OCV-2/_work/opencv/opencv/opencv/modules/core/misc/python/pyopencv_cuda.hpp(92): warning C4244: 'argument': conversion from 'int64_t' to 'int', possible loss of data

C:/GHA-OCV-2/_work/opencv/opencv/opencv/modules/core/misc/python/pyopencv_cuda.hpp(98): warning C4244: 'argument': conversion from 'int64_t' to 'int', possible loss of data

C:/GHA-OCV-2/_work/opencv/opencv/opencv/modules/core/misc/python/pyopencv_cuda.hpp(97): warning C4244: 'argument': conversion from 'int64_t' to 'int', possible loss of data

C:/GHA-OCV-2/_work/opencv/opencv/opencv/modules/core/misc/python/pyopencv_cuda.hpp(119): warning C4244: 'argument': conversion from 'int64_t' to 'int', possible loss of data

C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.29.30133\include\xmemory(681): warning C4244: 'initializing': conversion from 'value_t' to '_Objty', possible loss of data

@dkurt dkurt force-pushed the d.kuryaev/dlpack branch from cb28a92 to 52af6a5 Compare August 5, 2025 09:52
@dkurt dkurt changed the title dlpack Python support for cuda_GpuMat dlpack Python support for cuda_GpuMat and cuda_GpuMatND Aug 7, 2025
@dkurt dkurt marked this pull request as ready for review August 7, 2025 10:58
@dkurt dkurt mentioned this pull request Aug 7, 2025
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@kmaehashi kmaehashi mentioned this pull request Aug 7, 2025
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Any intention to add interoperability with DLPACK or mpi4py?
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