nbklu: Python bindings for SuiteSparse KLU

nbklu provides:

Full low-level bindings for the public klu.h API families
- 32-bit index real (klu_*)
- 32-bit index complex (klu_z_*)
- 64-bit index real (klu_l_*)
- 64-bit index complex (klu_zl_*)
A high-level solver API with typed variants.

Installation

pip install nbklu
# optional SciPy integration
pip install "nbklu[scipy]"
# or from source
pip install git+https://github.com/determ1ne/nbklu.git

Solver usage

import numpy as np
from nbklu import KLUSolver

n = 5
Ap = np.array([0, 2, 5, 9, 10, 12], dtype=np.int32)
Ai = np.array([0, 1, 0, 2, 4, 1, 2, 3, 4, 2, 1, 4], dtype=np.int32)
Ax = np.array([2.0, 3.0, 3.0, -1.0, 4.0, 4.0, -3.0, 1.0, 2.0, 2.0, 6.0, 1.0], dtype=np.float64)
b = np.array([8.0, 45.0, -3.0, 3.0, 19.0], dtype=np.float64)

solver = KLUSolver(index_bits=32, complex_values=False)
solver.analyze(n, Ap, Ai)
solver.factor(Ax)
x = solver.solve(b)
print(x)

Typed solver variants

KLUSolver32Real
KLUSolver32Complex
KLUSolver64Real
KLUSolver64Complex

All variants support:

analyze / analyze_given
factor / refactor
solve / tsolve
sort, flops, rgrowth, condest, rcond, scale, extract

Low-level API

Import nbklu._ext for direct C-parity functions (analyze, z_factor, l_solve, zl_extract, version, ...). Complex APIs accept both:

interleaved float64 arrays (KLU layout)
numpy.complex128 arrays.

Notes

KLU docs: https://github.com/DrTimothyAldenDavis/SuiteSparse/blob/dev/KLU/Doc/KLU_UserGuide.pdf
Python API docs: docs/python-api.md

SciPy API (`nbklu.scipy`)

SciPy integration interface mirrors scipy.sparse.linalg patterns:

import numpy as np
from scipy.sparse import csc_matrix
from nbklu.scipy import spsolve, factorized, splu

A = csc_matrix(...)
b = np.array(...)

x = spsolve(A, b)

solve = factorized(A)
x2 = solve(b)

lu = splu(A)
x3 = lu.solve(b)
x4 = lu.solve(b, trans="T")

This module accepts SciPy sparse matrices/arrays and internally dispatches to the appropriate KLU family.

Release files for nbklu 0.3.0

For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.

Source distribution (sdist)

Source distribution for nbklu 0.3.0
File	Size	Uploaded
nbklu-0.3.0.tar.gz	213.3 kB	Feb 23, 2026	Details

Built distributions (wheels)

Table of built distributions (wheels) for nbklu 0.3.0
File	Interpreter	ABI	Platform	Reset
nbklu-0.3.0-cp314-cp314t-win_amd64.whl 236.1 kB Feb 23, 2026	CPython 3.14	CPython 3.14 free-threading	Windows x86-64	Details
nbklu-0.3.0-cp314-cp314t-win32.whl 199.8 kB Feb 23, 2026	CPython 3.14	CPython 3.14 free-threading	Windows x86-32	Details
nbklu-0.3.0-cp314-cp314t-musllinux_1_2_x86_64.whl 341.0 kB Feb 23, 2026	CPython 3.14	CPython 3.14 free-threading	Linux musl 1.2+ x86-64	Details
nbklu-0.3.0-cp314-cp314t-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl 242.4 kB Feb 23, 2026	CPython 3.14	CPython 3.14 free-threading	Linux glibc 2.27+ x86-64, Linux glibc 2.28+ x86-64	Details
nbklu-0.3.0-cp312-abi3-win_amd64.whl 223.9 kB Feb 23, 2026	CPython 3.12	abi3	Windows x86-64	Details
nbklu-0.3.0-cp312-abi3-win32.whl 191.1 kB Feb 23, 2026	CPython 3.12	abi3	Windows x86-32	Details
nbklu-0.3.0-cp312-abi3-musllinux_1_2_x86_64.whl 334.9 kB Feb 23, 2026	CPython 3.12	abi3	Linux musl 1.2+ x86-64	Details
nbklu-0.3.0-cp312-abi3-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl 236.4 kB Feb 23, 2026	CPython 3.12	abi3	Linux glibc 2.27+ x86-64, Linux glibc 2.28+ x86-64	Details
nbklu-0.3.0-cp311-cp311-win_amd64.whl 225.9 kB Feb 23, 2026	CPython 3.11	CPython 3.11	Windows x86-64	Details
nbklu-0.3.0-cp311-cp311-win32.whl 193.0 kB Feb 23, 2026	CPython 3.11	CPython 3.11	Windows x86-32	Details
nbklu-0.3.0-cp311-cp311-musllinux_1_2_x86_64.whl 339.6 kB Feb 23, 2026	CPython 3.11	CPython 3.11	Linux musl 1.2+ x86-64	Details
nbklu-0.3.0-cp311-cp311-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl 241.0 kB Feb 23, 2026	CPython 3.11	CPython 3.11	Linux glibc 2.28+ x86-64, Linux glibc 2.27+ x86-64	Details
nbklu-0.3.0-cp310-cp310-win_amd64.whl 226.5 kB Feb 23, 2026	CPython 3.10	CPython 3.10	Windows x86-64	Details
nbklu-0.3.0-cp310-cp310-win32.whl 193.1 kB Feb 23, 2026	CPython 3.10	CPython 3.10	Windows x86-32	Details
nbklu-0.3.0-cp310-cp310-musllinux_1_2_x86_64.whl 339.8 kB Feb 23, 2026	CPython 3.10	CPython 3.10	Linux musl 1.2+ x86-64	Details
nbklu-0.3.0-cp310-cp310-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl 241.2 kB Feb 23, 2026	CPython 3.10	CPython 3.10	Linux glibc 2.27+ x86-64, Linux glibc 2.28+ x86-64	Details

Total release size: 4.2 MB

Release files / nbklu-0.3.0.tar.gz

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Publishing repository: github.com/determ1ne/nbklu
Publishing commit: github.com/determ1ne/nbklu/tree/85a57e352067b9b3d74437c87b3e6c70dbf27897

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Release files / nbklu-0.3.0-cp310-cp310-musllinux_1_2_x86_64.whl

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Publishing repository: github.com/determ1ne/nbklu
Publishing commit: github.com/determ1ne/nbklu/tree/85a57e352067b9b3d74437c87b3e6c70dbf27897

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Release files / nbklu-0.3.0-cp310-cp310-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl

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Uploaded via	`twine/6.1.0 CPython/3.13.7`

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Publishing repository: github.com/determ1ne/nbklu
Publishing commit: github.com/determ1ne/nbklu/tree/85a57e352067b9b3d74437c87b3e6c70dbf27897

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Release history Release notifications | RSS feed

This release

0.3.0 This release

Feb 23, 2026 17 release files

0.2.0

Dec 21, 2025 17 release files

0.1.0

Dec 21, 2025 17 release files

nbklu 0.3.0

nbklu: Python bindings for SuiteSparse KLU

Installation

Solver usage

Typed solver variants

Low-level API

Notes

SciPy API (nbklu.scipy)

Project links

Key dates

1 maintainer

Credits

GitHub Statistics

License expression

Requires

Provides Extra

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Release files for nbklu 0.3.0

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Release files / nbklu-0.3.0.tar.gz

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Release files / nbklu-0.3.0-cp311-cp311-win_amd64.whl

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SciPy API (`nbklu.scipy`)