lineax


Namelineax JSON
Version 0.0.5 PyPI version JSON
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home_pageNone
SummaryLinear solvers in JAX and Equinox.
upload_time2024-04-14 17:20:19
maintainerNone
docs_urlNone
authorNone
requires_python~=3.9
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keywords deep-learning equinox jax least-squares linear-solvers neural-networks numerical-methods
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            <h1 align='center'>Lineax</h1>

Lineax is a [JAX](https://github.com/google/jax) library for linear solves and linear least squares. That is, Lineax provides routines that solve for $x$ in $Ax = b$. (Even when $A$ may be ill-posed or rectangular.)

Features include:
- PyTree-valued matrices and vectors;
- General linear operators for Jacobians, transposes, etc.;
- Efficient linear least squares (e.g. QR solvers);
- Numerically stable gradients through linear least squares;
- Support for structured (e.g. symmetric) matrices;
- Improved compilation times;
- Improved runtime of some algorithms;
- Support for both real-valued and complex-valued inputs;
- All the benefits of working with JAX: autodiff, autoparallelism, GPU/TPU support, etc.

## Installation

```bash
pip install lineax
```

Requires Python 3.9+, JAX 0.4.13+, and [Equinox](https://github.com/patrick-kidger/equinox) 0.11.0+.

## Documentation

Available at [https://docs.kidger.site/lineax](https://docs.kidger.site/lineax).

## Quick examples

Lineax can solve a least squares problem with an explicit matrix operator:

```python
import jax.random as jr
import lineax as lx

matrix_key, vector_key = jr.split(jr.PRNGKey(0))
matrix = jr.normal(matrix_key, (10, 8))
vector = jr.normal(vector_key, (10,))
operator = lx.MatrixLinearOperator(matrix)
solution = lx.linear_solve(operator, vector, solver=lx.QR())
```

or Lineax can solve a problem without ever materializing a matrix, as done in this
quadratic solve:

```python
import jax
import lineax as lx

key = jax.random.PRNGKey(0)
y = jax.random.normal(key, (10,))

def quadratic_fn(y, args):
  return jax.numpy.sum((y - 1)**2)

gradient_fn = jax.grad(quadratic_fn)
hessian = lx.JacobianLinearOperator(gradient_fn, y, tags=lx.positive_semidefinite_tag)
solver = lx.CG(rtol=1e-6, atol=1e-6)
out = lx.linear_solve(hessian, gradient_fn(y, args=None), solver)
minimum = y - out.value
```

## Citation

If you found this library to be useful in academic work, then please cite: ([arXiv link](https://arxiv.org/abs/2311.17283))

```bibtex
@article{lineax2023,
    title={Lineax: unified linear solves and linear least-squares in JAX and Equinox},
    author={Jason Rader and Terry Lyons and Patrick Kidger},
    journal={
        AI for science workshop at Neural Information Processing Systems 2023,
        arXiv:2311.17283
    },
    year={2023},
}
```

(Also consider starring the project on GitHub.)

## Finally

### See also: other libraries in the JAX ecosystem

[jaxtyping](https://github.com/google/jaxtyping): type annotations for shape/dtype of arrays.

[Equinox](https://github.com/patrick-kidger/equinox): neural networks.

[Optax](https://github.com/deepmind/optax): first-order gradient (SGD, Adam, ...) optimisers.

[Diffrax](https://github.com/patrick-kidger/diffrax): numerical differential equation solvers.

[Optimistix](https://github.com/patrick-kidger/optimistix): root finding, minimisation, fixed points, and least squares.

[BlackJAX](https://github.com/blackjax-devs/blackjax): probabilistic+Bayesian sampling.

[Orbax](https://github.com/google/orbax): checkpointing (async/multi-host/multi-device).

[sympy2jax](https://github.com/google/sympy2jax): SymPy<->JAX conversion; train symbolic expressions via gradient descent.

[Eqxvision](https://github.com/paganpasta/eqxvision): computer vision models.

[Levanter](https://github.com/stanford-crfm/levanter): scalable+reliable training of foundation models (e.g. LLMs).

[PySR](https://github.com/milesCranmer/PySR): symbolic regression. (Non-JAX honourable mention!)

### Disclaimer

This is not an official Google product.

            

Raw data

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    "description": "<h1 align='center'>Lineax</h1>\n\nLineax is a [JAX](https://github.com/google/jax) library for linear solves and linear least squares. That is, Lineax provides routines that solve for $x$ in $Ax = b$. (Even when $A$ may be ill-posed or rectangular.)\n\nFeatures include:\n- PyTree-valued matrices and vectors;\n- General linear operators for Jacobians, transposes, etc.;\n- Efficient linear least squares (e.g. QR solvers);\n- Numerically stable gradients through linear least squares;\n- Support for structured (e.g. symmetric) matrices;\n- Improved compilation times;\n- Improved runtime of some algorithms;\n- Support for both real-valued and complex-valued inputs;\n- All the benefits of working with JAX: autodiff, autoparallelism, GPU/TPU support, etc.\n\n## Installation\n\n```bash\npip install lineax\n```\n\nRequires Python 3.9+, JAX 0.4.13+, and [Equinox](https://github.com/patrick-kidger/equinox) 0.11.0+.\n\n## Documentation\n\nAvailable at [https://docs.kidger.site/lineax](https://docs.kidger.site/lineax).\n\n## Quick examples\n\nLineax can solve a least squares problem with an explicit matrix operator:\n\n```python\nimport jax.random as jr\nimport lineax as lx\n\nmatrix_key, vector_key = jr.split(jr.PRNGKey(0))\nmatrix = jr.normal(matrix_key, (10, 8))\nvector = jr.normal(vector_key, (10,))\noperator = lx.MatrixLinearOperator(matrix)\nsolution = lx.linear_solve(operator, vector, solver=lx.QR())\n```\n\nor Lineax can solve a problem without ever materializing a matrix, as done in this\nquadratic solve:\n\n```python\nimport jax\nimport lineax as lx\n\nkey = jax.random.PRNGKey(0)\ny = jax.random.normal(key, (10,))\n\ndef quadratic_fn(y, args):\n  return jax.numpy.sum((y - 1)**2)\n\ngradient_fn = jax.grad(quadratic_fn)\nhessian = lx.JacobianLinearOperator(gradient_fn, y, tags=lx.positive_semidefinite_tag)\nsolver = lx.CG(rtol=1e-6, atol=1e-6)\nout = lx.linear_solve(hessian, gradient_fn(y, args=None), solver)\nminimum = y - out.value\n```\n\n## Citation\n\nIf you found this library to be useful in academic work, then please cite: ([arXiv link](https://arxiv.org/abs/2311.17283))\n\n```bibtex\n@article{lineax2023,\n    title={Lineax: unified linear solves and linear least-squares in JAX and Equinox},\n    author={Jason Rader and Terry Lyons and Patrick Kidger},\n    journal={\n        AI for science workshop at Neural Information Processing Systems 2023,\n        arXiv:2311.17283\n    },\n    year={2023},\n}\n```\n\n(Also consider starring the project on GitHub.)\n\n## Finally\n\n### See also: other libraries in the JAX ecosystem\n\n[jaxtyping](https://github.com/google/jaxtyping): type annotations for shape/dtype of arrays.\n\n[Equinox](https://github.com/patrick-kidger/equinox): neural networks.\n\n[Optax](https://github.com/deepmind/optax): first-order gradient (SGD, Adam, ...) optimisers.\n\n[Diffrax](https://github.com/patrick-kidger/diffrax): numerical differential equation solvers.\n\n[Optimistix](https://github.com/patrick-kidger/optimistix): root finding, minimisation, fixed points, and least squares.\n\n[BlackJAX](https://github.com/blackjax-devs/blackjax): probabilistic+Bayesian sampling.\n\n[Orbax](https://github.com/google/orbax): checkpointing (async/multi-host/multi-device).\n\n[sympy2jax](https://github.com/google/sympy2jax): SymPy<->JAX conversion; train symbolic expressions via gradient descent.\n\n[Eqxvision](https://github.com/paganpasta/eqxvision): computer vision models.\n\n[Levanter](https://github.com/stanford-crfm/levanter): scalable+reliable training of foundation models (e.g. LLMs).\n\n[PySR](https://github.com/milesCranmer/PySR): symbolic regression. (Non-JAX honourable mention!)\n\n### Disclaimer\n\nThis is not an official Google product.\n",
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    "license": "Apache License Version 2.0, January 2004 http://www.apache.org/licenses/  TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION  1. Definitions.  \"License\" shall mean the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 of this document.  \"Licensor\" shall mean the copyright owner or entity authorized by the copyright owner that is granting the License.  \"Legal Entity\" shall mean the union of the acting entity and all other entities that control, are controlled by, or are under common control with that entity. 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For the purposes of this License, Derivative Works shall not include works that remain separable from, or merely link (or bind by name) to the interfaces of, the Work and Derivative Works thereof.  \"Contribution\" shall mean any work of authorship, including the original version of the Work and any modifications or additions to that Work or Derivative Works thereof, that is intentionally submitted to Licensor for inclusion in the Work by the copyright owner or by an individual or Legal Entity authorized to submit on behalf of the copyright owner. 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If You institute patent litigation against any entity (including a cross-claim or counterclaim in a lawsuit) alleging that the Work or a Contribution incorporated within the Work constitutes direct or contributory patent infringement, then any patent licenses granted to You under this License for that Work shall terminate as of the date such litigation is filed.  4. Redistribution. You may reproduce and distribute copies of the Work or Derivative Works thereof in any medium, with or without modifications, and in Source or Object form, provided that You meet the following conditions:  (a) You must give any other recipients of the Work or Derivative Works a copy of this License; and  (b) You must cause any modified files to carry prominent notices stating that You changed the files; and  (c) You must retain, in the Source form of any Derivative Works that You distribute, all copyright, patent, trademark, and attribution notices from the Source form of the Work, excluding those notices that do not pertain to any part of the Derivative Works; and  (d) If the Work includes a \"NOTICE\" text file as part of its distribution, then any Derivative Works that You distribute must include a readable copy of the attribution notices contained within such NOTICE file, excluding those notices that do not pertain to any part of the Derivative Works, in at least one of the following places: within a NOTICE text file distributed as part of the Derivative Works; within the Source form or documentation, if provided along with the Derivative Works; or, within a display generated by the Derivative Works, if and wherever such third-party notices normally appear. The contents of the NOTICE file are for informational purposes only and do not modify the License. You may add Your own attribution notices within Derivative Works that You distribute, alongside or as an addendum to the NOTICE text from the Work, provided that such additional attribution notices cannot be construed as modifying the License.  You may add Your own copyright statement to Your modifications and may provide additional or different license terms and conditions for use, reproduction, or distribution of Your modifications, or for any such Derivative Works as a whole, provided Your use, reproduction, and distribution of the Work otherwise complies with the conditions stated in this License.  5. Submission of Contributions. Unless You explicitly state otherwise, any Contribution intentionally submitted for inclusion in the Work by You to the Licensor shall be under the terms and conditions of this License, without any additional terms or conditions. Notwithstanding the above, nothing herein shall supersede or modify the terms of any separate license agreement you may have executed with Licensor regarding such Contributions.  6. Trademarks. This License does not grant permission to use the trade names, trademarks, service marks, or product names of the Licensor, except as required for reasonable and customary use in describing the origin of the Work and reproducing the content of the NOTICE file.  7. Disclaimer of Warranty. Unless required by applicable law or agreed to in writing, Licensor provides the Work (and each Contributor provides its Contributions) on an \"AS IS\" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied, including, without limitation, any warranties or conditions of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A PARTICULAR PURPOSE. You are solely responsible for determining the appropriateness of using or redistributing the Work and assume any risks associated with Your exercise of permissions under this License.  8. Limitation of Liability. In no event and under no legal theory, whether in tort (including negligence), contract, or otherwise, unless required by applicable law (such as deliberate and grossly negligent acts) or agreed to in writing, shall any Contributor be liable to You for damages, including any direct, indirect, special, incidental, or consequential damages of any character arising as a result of this License or out of the use or inability to use the Work (including but not limited to damages for loss of goodwill, work stoppage, computer failure or malfunction, or any and all other commercial damages or losses), even if such Contributor has been advised of the possibility of such damages.  9. Accepting Warranty or Additional Liability. 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We also recommend that a file or class name and description of purpose be included on the same \"printed page\" as the copyright notice for easier identification within third-party archives.  Copyright [yyyy] [name of copyright owner]  Licensed under the Apache License, Version 2.0 (the \"License\"); you may not use this file except in compliance with the License. You may obtain a copy of the License at  http://www.apache.org/licenses/LICENSE-2.0  Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an \"AS IS\" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.",
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