v1.26.1

NumPy 1.26.1 Release Notes

NumPy 1.26.1 is a maintenance release that fixes bugs and regressions
discovered after the 1.26.0 release. In addition, it adds new
functionality for detecting BLAS and LAPACK when building from source.
Highlights are:

• Improved detection of BLAS and LAPACK libraries for meson builds
• Pickle compatibility with the upcoming NumPy 2.0.

The 1.26.release series is the last planned minor release series before
NumPy 2.0. The Python versions supported by this release are 3.9-3.12.

Build system changes

Improved BLAS/LAPACK detection and control

Auto-detection for a number of BLAS and LAPACK is now implemented for
Meson. By default, the build system will try to detect MKL, Accelerate
(on macOS >=13.3), OpenBLAS, FlexiBLAS, BLIS and reference BLAS/LAPACK.
Support for MKL was significantly improved, and support for FlexiBLAS
was added.

New command-line flags are available to further control the selection of
the BLAS and LAPACK libraries to build against.

To select a specific library, use the config-settings interface via
pip or pypa/build. E.g., to select libblas/liblapack, use:

$ pip install numpy -Csetup-args=-Dblas=blas -Csetup-args=-Dlapack=lapack
$ # OR
$ python -m build . -Csetup-args=-Dblas=blas -Csetup-args=-Dlapack=lapack

This works not only for the libraries named above, but for any library
that Meson is able to detect with the given name through pkg-config or
CMake.

Besides -Dblas and -Dlapack, a number of other new flags are
available to control BLAS/LAPACK selection and behavior:

• -Dblas-order and -Dlapack-order: a list of library names to
  search for in order, overriding the default search order.
• -Duse-ilp64: if set to true, use ILP64 (64-bit integer) BLAS and
  LAPACK. Note that with this release, ILP64 support has been extended
  to include MKL and FlexiBLAS. OpenBLAS and Accelerate were supported
  in previous releases.
• -Dallow-noblas: if set to true, allow NumPy to build with its
  internal (very slow) fallback routines instead of linking against an
  external BLAS/LAPACK library. The default for this flag may be
  changed to ``true`` in a future 1.26.x release, however for
  1.26.1 we'd prefer to keep it as ``false`` because if failures
  to detect an installed library are happening, we'd like a bug
  report for that, so we can quickly assess whether the new
  auto-detection machinery needs further improvements.
• -Dmkl-threading: to select the threading layer for MKL. There are
  four options: seq, iomp, gomp and tbb. The default is
  auto, which selects from those four as appropriate given the
  version of MKL selected.
• -Dblas-symbol-suffix: manually select the symbol suffix to use for
  the library - should only be needed for linking against libraries
  built in a non-standard way.

New features

numpy._core submodule stubs

numpy._core submodule stubs were added to provide compatibility with
pickled arrays created using NumPy 2.0 when running Numpy 1.26.

Contributors

A total of 13 people contributed to this release. People with a "+" by
their names contributed a patch for the first time.

• Andrew Nelson
• Anton Prosekin +
• Charles Harris
• Chongyun Lee +
• Ivan A. Melnikov +
• Jake Lishman +
• Mahder Gebremedhin +
• Mateusz Sokół
• Matti Picus
• Munira Alduraibi +
• Ralf Gommers
• Rohit Goswami
• Sayed Adel

Pull requests merged

A total of 20 pull requests were merged for this release.

• #24742: MAINT: Update cibuildwheel version
• #24748: MAINT: fix version string in wheels built with setup.py
• #24771: BLD, BUG: Fix build failure for host flags e.g. -march=native...
• #24773: DOC: Updated the f2py docs to remove a note on -fimplicit-none
• #24776: BUG: Fix SIMD f32 trunc test on s390x when baseline is none
• #24785: BLD: add libquadmath to licences and other tweaks (#24753)
• #24786: MAINT: Activate use-compute-credits for Cirrus.
• #24803: BLD: updated vendored-meson/meson for mips64 fix
• #24804: MAINT: fix licence path win
• #24813: BUG: Fix order of Windows OS detection macros.
• #24831: BUG, SIMD: use scalar cmul on bad Apple clang x86_64 (#24828)
• #24840: BUG: Fix DATA statements for f2py
• #24870: API: Add NumpyUnpickler for backporting
• #24872: MAINT: Xfail test failing on PyPy.
• #24879: BLD: fix math func feature checks, fix FreeBSD build, add CI...
• #24899: ENH: meson: implement BLAS/LAPACK auto-detection and many CI...
• #24902: DOC: add a 1.26.1 release notes section for BLAS/LAPACK build...
• #24906: MAINT: Backport numpy._core stubs. Remove NumpyUnpickler
• #24911: MAINT: Bump pypa/cibuildwheel from 2.16.1 to 2.16.2
• #24912: BUG: loongarch doesn't use REAL(10)

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