patrick-kidger/optimistix

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Nonlinear optimisation (root-finding, least squares, ...) in JAX+Equinox. https://docs.kidger.site/optimistix/

Stars: 623
Forks: 54
Open beginner issues: 0
Indexed issues: 67

Dominant language: Python
License: Apache-2.0
Last GitHub push: Aug 11, 2026
Latest indexed: Sep 20, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed
PR merge metrics: No merged PRs in 30d

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67 open issues indexed

`GoldenSearch` returns wrong results for any bracket not straddling zero Open

Difficulty 1/5 Under an hour Newbie friendliness 82/100

patrick-kidger/optimistix#236 · 1 comment · Opened Aug 7, 2026
Fixed point tangent solve Open

question

Difficulty 4/5 3-5 days Newbie friendliness 48/100

patrick-kidger/optimistix#231 · 1 comment · Opened May 16, 2026
NaNs encountered when taking the quotient of two arrays Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

patrick-kidger/optimistix#229 · 3 comments · Opened May 1, 2026
Self-Scaled Broyden Family of Quasi-Newton Methods implementation Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

patrick-kidger/optimistix#223 · 1 comment · Opened Mar 12, 2026
Status of constrained non-linear optimization Open

question

Difficulty 5/5 Over a week Newbie friendliness 25/100

patrick-kidger/optimistix#222 · 5 comments · Opened Mar 9, 2026
Tolerance schemes when using iterative solvers in least squares Open

question

Difficulty 5/5 Over a week Newbie friendliness 25/100

patrick-kidger/optimistix#208 · 6 comments · Opened Jan 29, 2026
Is `throw=False` option in `root_find` meant to catch solver fails? Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

patrick-kidger/optimistix#206 · 1 comment · Opened Jan 25, 2026
A question about optx.root_find() to find roots Open

question

Difficulty 3/5 1-2 days Newbie friendliness 25/100

patrick-kidger/optimistix#204 · 2 comments · Opened Jan 8, 2026
Scalable optimization for large data Open

question

Difficulty 5/5 Over a week Newbie friendliness 25/100

patrick-kidger/optimistix#201 · 3 comments · Opened Dec 30, 2025
Is it possible to plug a custom (preconditioned) gradient into Optimistix? Open

question

Difficulty 5/5 Over a week Newbie friendliness 20/100

patrick-kidger/optimistix#198 · 2 comments · Opened Dec 22, 2025
feature request: Ability for more advanced debug callbacks. Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

patrick-kidger/optimistix#192 · Opened Dec 3, 2025
Scale-invariant Levenberg-Marquardt Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

patrick-kidger/optimistix#187 · 13 comments · Opened Nov 7, 2025
Flexibility in how solves are terminated Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

patrick-kidger/optimistix#182 · 5 comments · Opened Oct 31, 2025
Creating an `AbstractMinimiser` with `DampedNewtonDescent` Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

patrick-kidger/optimistix#181 · 3 comments · Opened Oct 31, 2025
Why is jax.lax.custom_root not used? Open

question

Difficulty 5/5 Over a week Newbie friendliness 25/100

patrick-kidger/optimistix#172 · 1 comment · Opened Oct 6, 2025
JAX 0.7.2 breaks least_squares Open

question

Difficulty 4/5 3-5 days Newbie friendliness 35/100

patrick-kidger/optimistix#170 · 1 comment · Opened Sep 30, 2025
More root finding methods Open

feature

Difficulty 5/5 Over a week Newbie friendliness 25/100

patrick-kidger/optimistix#167 · 8 comments · Opened Sep 13, 2025
`NewtonChord` w/ `cauchy_termination=False` divergence test unhelfpul when `atol` is low Open

question

Difficulty 3/5 1-2 days Newbie friendliness 45/100

patrick-kidger/optimistix#165 · 6 comments · Opened Sep 10, 2025
Can we use GaussNewton/LevenbergMarquardt on KL loss minimization Open

question

Difficulty 5/5 Over a week Newbie friendliness 25/100

patrick-kidger/optimistix#162 · 3 comments · Opened Sep 2, 2025
Allow for dynamic `atol` Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

patrick-kidger/optimistix#161 · 3 comments · Opened Sep 1, 2025
Differentiating auxiliary variables Open

question

Difficulty 5/5 Over a week Newbie friendliness 35/100

patrick-kidger/optimistix#154 · 4 comments · Opened Jul 31, 2025
Feature Request: SQUAREM Accelerated Fixed Point Methods Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

patrick-kidger/optimistix#152 · 1 comment · Opened Jul 26, 2025
Question about `BestSoFar` wrapper and handling of `max_steps` Open

question

Difficulty 5/5 Over a week Newbie friendliness 25/100

patrick-kidger/optimistix#147 · 9 comments · Opened Jul 14, 2025
Running multiple optimizations at once Open

question

Difficulty 5/5 Over a week Newbie friendliness 30/100

patrick-kidger/optimistix#144 · 15 comments · Opened Jun 28, 2025
Issue with BFGS + vmap + diagonal Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

patrick-kidger/optimistix#142 · 4 comments · Opened Jun 8, 2025
Alternating between variables Open

question

Difficulty 5/5 Over a week Newbie friendliness 25/100

patrick-kidger/optimistix#141 · 14 comments · Opened Jun 1, 2025
Is single precision a mistake? Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

patrick-kidger/optimistix#139 · 8 comments · Opened May 19, 2025
Descent has to know about solver options, at least in some cases Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

patrick-kidger/optimistix#138 · 2 comments · Opened May 14, 2025
Array contents are not always displayed with verbose output Open

question

Difficulty 3/5 1-2 days Newbie friendliness 35/100

patrick-kidger/optimistix#137 · 1 comment · Opened May 14, 2025
Add support for progress meters Open

feature

Difficulty 5/5 Over a week Newbie friendliness 25/100

patrick-kidger/optimistix#134 · 1 comment · Opened Apr 25, 2025
Not working: Minimizing a loss function using Levenberg–Marquardt algorithm Open

question

Difficulty 4/5 3-5 days Newbie friendliness 25/100

patrick-kidger/optimistix#124 · 3 comments · Opened Mar 17, 2025
Help with adding (quasi-newton) Davidon–Fletcher–Powell update method? Open

feature

Difficulty 5/5 Over a week Newbie friendliness 25/100

patrick-kidger/optimistix#123 · 4 comments · 2 reactions · Opened Mar 12, 2025
Newton versus Dogleg/LM with partial jit Open

question

Difficulty 4/5 3-5 days Newbie friendliness 25/100

patrick-kidger/optimistix#120 · 4 comments · Opened Mar 8, 2025
Extracting the hessian at the minimum from the optimization `Solution` Open

question

Difficulty 5/5 Over a week Newbie friendliness 28/100

patrick-kidger/optimistix#117 · 4 comments · 1 reaction · Opened Feb 28, 2025
Proximal gradient and L-BFGS Open

feature

Difficulty 5/5 Over a week Newbie friendliness 25/100

patrick-kidger/optimistix#116 · 3 comments · Opened Feb 21, 2025
`minimize` and forward AD Open

question

Difficulty 5/5 Over a week Newbie friendliness 25/100

patrick-kidger/optimistix#112 · 19 comments · Opened Jan 24, 2025
Control over Learning Rate and/or initial step size in linesearch Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

patrick-kidger/optimistix#108 · 10 comments · Opened Jan 8, 2025
Using optimistix to solve optimization problems in parallel? Open

question

Difficulty 5/5 Over a week Newbie friendliness 25/100

patrick-kidger/optimistix#106 · 4 comments · Opened Jan 3, 2025
Interactively step through solve with jax.lax.scan Open

question

Difficulty 4/5 3-5 days Newbie friendliness 35/100

patrick-kidger/optimistix#103 · 2 comments · Opened Dec 31, 2024
Large scale root-finding Open

question

Difficulty 5/5 Over a week Newbie friendliness 25/100

patrick-kidger/optimistix#93 · 7 comments · Opened Nov 13, 2024
Improving LM implementation Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

patrick-kidger/optimistix#92 · 10 comments · Opened Nov 3, 2024
Least squares performance Open

question

Difficulty 5/5 Over a week Newbie friendliness 25/100

patrick-kidger/optimistix#88 · 2 comments · Opened Oct 28, 2024
Optimization with state Open

question

Difficulty 5/5 Over a week Newbie friendliness 20/100

patrick-kidger/optimistix#83 · 1 comment · Opened Sep 18, 2024
First step of `GradientDescent` optimizer is a no-op Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

patrick-kidger/optimistix#82 · 1 comment · Opened Sep 5, 2024
FutureWarning (unhashable type) thrown with LM solver Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

patrick-kidger/optimistix#81 · 1 comment · Opened Sep 2, 2024
Support complex-to-real optimization Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

patrick-kidger/optimistix#76 · 11 comments · Opened Aug 17, 2024
Accessing the (success/not) result of the solver Open

question

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

patrick-kidger/optimistix#72 · 1 comment · Opened Aug 9, 2024
Optimization across multidimensional array Open

question

Difficulty 5/5 Over a week Newbie friendliness 20/100

patrick-kidger/optimistix#70 · 4 comments · Opened Jul 30, 2024
Parallel multi start Open

question

Difficulty 5/5 Over a week Newbie friendliness 25/100

patrick-kidger/optimistix#67 · 10 comments · Opened Jun 27, 2024
Can't vmap across input using Gauss Newton fwd Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 38/100

patrick-kidger/optimistix#63 · 11 comments · 1 reaction · Opened May 31, 2024

patrick-kidger/optimistix

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