rslab (Python bindings)

NumPy/SciPy bindings for RSLAB, a pure-Rust sparse direct solver and preconditioner: complex/real symmetric LDLᵀ (Bunch-Kaufman) plus unsymmetric LU. A thin wrapper, all numeric work happens in Rust.

Install

pip install rslab

Usage

import numpy as np
import scipy.sparse as sp
import rslab

# Symmetric system (real or complex; the dtype selects the path).
A = sp.random(5000, 5000, density=1e-3, format="csc") + sp.eye(5000) * 10
A = A + A.T
b = np.random.rand(5000)

# One-shot solve.
x = rslab.spsolve(A, b)

# Factor once, solve many right-hand sides.
f = rslab.ldlt(A)
x1 = f.solve(b)
X = f.solve_many(np.random.rand(5000, 8))   # n x nrhs

print(f.n, f.factor_nnz, f.inertia, f.dtype)

Complex-symmetric matrices (EM/FEM, PARDISO mtype 6) work identically:

A = A.astype(np.complex128); A.data += 1j * 0.3 * A.data.real
x = rslab.ldlt(A).solve(np.ones(A.shape[0], dtype=np.complex128))

Unsymmetric matrices use the LU path:

f = rslab.lu(A_general)
x = f.solve(b)

Circuit-shaped matrices (MNA / SPICE-class: very sparse, unsymmetric, near-triangularizable) use the KLU path — bit-deterministic, with a numeric-only refactor for fixed-pattern sweeps:

f = rslab.klu(A_circuit)
x = f.solve(b)
A_circuit.data *= 1.5            # frequency sweep: same pattern, new values
f.refactor(A_circuit.data)       # no symbolic work, no pivot search
x2 = f.solve(b)
y = f.solve_transpose(b)         # A.T @ y = b on the same factors (adjoint)

solve_transpose is the plain transpose; for the conjugate-transpose adjoint use f.solve_transpose(b.conj()).conj().

Preconditioner mode

Never-fail static pivoting plus iterative refinement for hard/indefinite systems:

f = rslab.ldlt(A, preconditioner=1e-4)
x = f.solve(b, refine=20)        # refine against the original A

Configuration (keyword arguments)

ldlt, lu and spsolve accept:

kwarg	default	meaning
`threads`	`None` (auto)	`None` = per-matrix auto predictor, capped at 4 workers; int = fixed (`0` = all)
`preconditioner`	`None`	static-pivot floor (e.g. `1e-4`); never-fail, refine to solve
`drop_tol`	`None`	incomplete-factor threshold (preconditioner)
`method`	`"left_looking"`	`"left_looking"` or `"multifrontal"`
`memory`	`"low"`	`"low"` or `"eager"` factor emit strategy
`force_accept`	`False`	accept tiny pivots in exact mode instead of failing

klu accepts:

kwarg	default	meaning
`pivot_tol`	`1e-3`	diagonal-preference threshold; `1.0` = plain partial pivoting
`row_scaling`	`True`	divide each row by its max-magnitude entry before factoring
`btf`	`True`	permute to block upper triangular form first (keep it on)

Supported dtypes: float64, float32, complex128, complex64.

License

MIT.

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Jun 29, 2026

rslab 0.17.0

rslab (Python bindings)

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