This is the release note of v13.4.0. See here for the complete list of solved issues and merged PRs.

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✨ Highlights

NVIDIA CUDA 12.8 Support

CuPy now supports CUDA 12.8 and the latest NVIDIA Blackwell architecture.

AMD ROCm 6.x Support

CuPy can now be built with AMD ROCm 6.x.

Python 3.13 Support

Binary packages for Python 3.13 are now available.

🛠️ Changes without compatibility

Cython 3.0 as build requirement (#8959)

To provide support for Python 3.13, CuPy codebase has been updated for Cython 3. To build CuPy from source, Cython 3.0 or later is now required instead of Cython 0.29.x.

📝 Changes

New Features

• Add cupyx.signal.mvdr (#8872)

Enhancements

• Support ROCm 6 (#8608)
• Support setuptools 74.0.0 or later (#8649)
• Use custom less instead of specializing thrust (#8653)
• Add NCCL_ERROR_REMOTE_ERROR to the set of errors from NCCL (#8667)
• Replace numpy.ComplexWarning with cupy.exceptions.ComplexWarning (#8678)
• Use weakref.finalize instead of del for RandomState._generator destruction (#8680)
• Implement dlpack v1 (#8722)
• Fix some NumPy 2.x CI failures (cont.) (#8725)
• Bump CUDA version in cuda11x-cuda-python CI (#8743)
• ROCm 6.2.2: Conditionally define CUDA_SUCCESS only if it's not (#8799)
• Raise VisibleDeprecationWarning for wavelet functions (#8868)
• Use a custom Min/Max instead of specializing CUB (#8875)
• Updating pylibraft pairwise_distance to cuvs (#8897)
• Support CUDA 12.8 + Blackwell GPUs (sm_100, sm_120) (#8915)
• Interpolate: update RBF to scipy 1.13 (#8939)
• Use C++17 in JIT compile (#8941)
• Bump library installers for CUDA 12.8 (#8943)
• Use CCCL 2.8.x branch + Use CUPY_CACHE_KEY in hash keys (#8946)
• Use NVIDIA CCCL 2.8 latest w/CUDA 12.3 fix (#8948)
• Broaden usage of C++17 (#8958)
• Port to Cython 3.0 (#8959)
• cupyx.scipy.distance: initialize output array with empty instead of zeros (#8981)
• cupyx.scipy.spatial.distance.cdist remove explicit zeroing of user-provided output array (#8990)
• Skip sparse.linalg.{cg, cgs, gmres} tests for scipy>=1.14 (#8551)
• cupyx.scipy.sparse tests for SciPy 1.14 (#8552)
• Fix some NumPy 2.x CI failures (cupyx) (#8738)
• Fix cupy.percentile for NumPy 2.x (#8752)
• Skip some tests incompatible with NumPy 2.2 (#8830)
• Disable contiguous_check for COO/dense matmul test (#8888)
• Raise ValueError upon attempts to create 3-dim sparse array (#8889)
• Skip a test for invalid scipy return value of invalid COO matmul (#8890)
• Fix fft.fht following bug fix in SciPy 1.15 (#8891)
• Support empty tuple indexing for sparse matrix (#8892)
• Deprecate cupyx.scipy.linalg.kron (#8902)
• Fix test for special.sph_harm to ignore DeprecationWarning (#8906)

Bug Fixes

• Add nccl.broadcast 64-bit support (#8566)
• Support building CuPy with setuptools 74 (#8577)
• Fix order 'K' with shape given for *_like array creation (#8605)
• hipPointerGetAttributes returns error when pointer is unregistered in ROCm 5.7 (#8609)
• Guard for ROCm 6.x (#8611)
• Fix HIP_VERSION unit (#8619)
• Switch to using platform.machine() instead of platform.processor() (#8656)
• Properly allocate in RNG when specified dtype is neither float32/float64 (#8658)
• Use platform.machine() instead of platform.processor() (#8673)
• Fix sosfilt state output shape when ndim < 2 (#8679)
• Fix undefined inf/nan constant in CuPy JIT (#8712)
• Fix bspline kernel to avoid out of bounds error (#8763)
• Fix race during SoftLink initialization (#8787)
• fix nanargmin and nanargmax's parameter order and pass optional parameters (#8791)
• Fix crashes of quantile and percentile (#8811)
• Fix handling of pinned memory (#8852)
• Use /bigobj on Windows build (#8967)
• Fix cupyx.scipy.spatial.distance's cdist for RAPIDS 24.12 compatibility (#8975)

Code Fixes

• Upgrade pre-commit hooks to silence warnings (#8666)
• Resolve import loop (#8714)
• Resolve uncaught type warning (#8798)
• Switch from .A attribute to .toarray() method (#8814)
• Fix typo in _cretate_frame_tree (#8944)
• Drop unneeded bytes copy of CUPY_CACHE_KEY (#8947)

Documentation

• Add docs about CUDA headers (#8595)
• Update fft.rst (#8617)
• Update documentation to use pre-commit (#8650)
• Add tips on Windows development in Contribution Guide (#8704)
• Add notice about cupy.array_api removal (#8751)
• Add CUDA 12.8 to docs (#8968)
• Update list of supported versions (#8991)

Installation

• Update conda-build CUDA detection logic for Setuptools 72.2.0 (#8652)
• Use relative path of header files to generate cache key (#8930)
• Fix minimum CUDA version check and update comments (#8938)
• Bump version to v13.4.0 (#8993)

Tests

• Relax test_firls atol (#8522)
• Skip test_homomorphic in scipy>=1.14 (#8523)
• Skip betaincinv test with SciPy 1.14.1 (#8553)
• Skip special tests for SciPy 1.14 dtype rule changes (#8554)
• Skip special.logsumexp test for empty input (#8555)
• Skip cupy.scipy.stats.entropy tessts for SciPy 1.14 dtype rule change (#8556)
• Use setuptools==73.0.1 (#8569)
• Revert CI timeout bump (#8571)
• Support SciPy 1.13 and 1.14 (#8572)
• Missing backport for sparse_array.A removal (#8573)
• Skip test_log_expit SciPy 1.7 (#8576)
• Catch ValueError (#8625)
• Use testing.with_requires to skip broken tests (#8627)
• CI: Update micro versions of Python (#8635)
• Skip tests if scipy is not installed (#8637)
• Accept OverflowError in TestCopytoFromScalar for NumPy v2 (#8643)
• Skip more tests if scipy is not installed (#8645)
• Update precommit (#8663)
• Backport the changes introduced in [#8690] (#8694)
• CI: Fix apt repository URL for Ubuntu 22.04 (#8715)
• Remove ndarray.ptp from fallback tests (#8744)
• Temporary skip for NumPy 2.0 tests (#8745)
• Relax tolerance of test_hilbert for NumPy 2.0 (#8746)
• Bump SciPy version to 1.14 in Windows CI (#8764)
• Add NumPy 2.x CI for Linux (#8768)
• CI: support "skip-ci" label (#8841)
• CI: Fix FlexCI compatibility (#8842)
• Add NumPy 2.2 to CI (#8855)
• Replace flake8 with ruff (#8859)
• Support Optuna 4 (#8863)
• Add testing.shaped_linspace (#8900)
• Disable contiguous_check for some signal.cont2discrete tests (#8901)
• Fix splines tests to remove unexpected skips (#8921)
• Minor updates for sm120 (#8922)
• Add CI for CUDA 12.8 (#8951)
• Increase host memory in Windows CI, free GPU memory in example code (#8969)
• Skip some signal tests for TypeError for inputs of np.longlong dtype (#8972)
• Add CI for Python 3.13 and mpi4py v4 (#8974)
• Pass locals dict to exec (#8985)

Others

• Add backport reminder (#8684)
• Fix script name of backport reminder (#8686)
• Update pre-commit hooks (#8910)
• Fix pull request project board workflows (#8929)
• Regenerate coverage matrix (#8960)

👥 Contributors

The CuPy Team would like to thank all those who contributed to this release!

@99991 @andfoy @asi1024 @Azusachan @bernhardmgruber @Berrysoft @chainer-ci @cjnolet @dagardner-nv @EarlMilktea @eltociear @ev-br @grlee77 @HollowMan6 @jakirkham @jemiryguo @kmaehashi @leofang @littlewu2508 @mohitreddy1996 @mroeschke @seberg @takagi