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Changelog

v1.0.1 (in progress)

No user-visible changes yet.

v1.0.0 (15 April 2026)

First release under modern Python and modern packaging.

Python 2.7 and 3.4 are no longer supported.

New

  • Python 3.11 – 3.14 supported.
    • Pre-built wheels on PyPI for Linux, macOS, and Windows, with OpenMP parallelism enabled in every wheel.

Fixed

  • Data race in fit_1D_many_parallel, pre-existing from 2016.

    • Every OpenMP worker clobbered thread-0's work buffer, producing silently wrong fits whenever the parallel 1D many-case path ran with ntasks > 1. The 2D/3D branch, the iterative parallel variant, and the serial variant were always correct.

  • rescale_dgeequ no longer silently accepts singular matrices.

    • It now checks LAPACK's info return and raises numpy.linalg.LinAlgError when a row or column is exactly zero.

Changed

  • Installation is now pip install wlsqm.

    • The old python setup.py install path is gone; setup.py has been removed.
    • The build system is meson-python, and dev environments are managed with PDM.

  • Language change on "Taylor series."

    • The storage layout still uses the same slots a Taylor expansion would (e.g. in 2D, f, ∂f/∂x, ∂f/∂y, ∂²f/∂x², ∂²f/∂x∂y, ∂²f/∂y², …), but the comments and docstrings no longer call the polynomial model a "Taylor series."
    • In the WLSQM method, the coefficients actually come from a least-squares fit, not from analytic differentiation. The error behavior is much better than the truncation of a Taylor series would predict.
    • The internal C-API function names taylor_1D/2D/3D are kept for backwards compatibility of downstream cimports — see wlsqm/fitter/polyeval.pyx.

Internal

  • Port from Cython 0.29 to Cython 3.x.

  • Comprehensive pytest suite. 57 tests, covering:

    • polynomial recovery across dimensions and orders,
    • ExpertSolver prepare/solve round-trips,
    • interpolation accuracy at interior points,
    • parallel ≡ serial implementation equivalence,
    • finite-difference stencil reproduction,
    • first-derivative robustness to Gaussian noise,
    • edge cases,
    • the LAPACK driver layer, and
    • .pxd installability for downstream cimport users.

  • ScalingAlgo is now a proper enum.IntEnum, replacing the old bare-class Python 2 workaround.

  • GitHub Actions CI: lint (ruff + cython-lint), test matrix (3 OSes × 4 Python versions), cibuildwheel for Linux/macOS/Windows wheels, meson-python sdist, and auto-publishing of releases on PyPI.

Pre-v1.0 history (2016-2017)

[v0.1.5]

  • support both Python 3.4 and 2.7

[v0.1.4]

  • actually use the shorter short description (oops)

[v0.1.3]

  • setup.py is now Python 3 compatible (but wlsqm itself is not yet!)
  • fixed sdist: package also CHANGELOG.md

[v0.1.2]

  • set zip_safe to False to better work with Cython (important for libs that depend on this one)

[v0.1.1]

  • change distribution system from distutils to setuptools

[v0.1.0]

  • initial version