A thin set of pybind11 wrappers to HiGHS

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Project description

HiGHS - Linear optimization software

About HiGHS
Documentation
Installation
Running HiGHS
Interfaces
- Python
- C
- CSharp
- Fortran
Reference

About HiGHS

HiGHS is a high performance serial and parallel solver for large scale sparse linear optimization problems of the form

$$ \min \quad \dfrac{1}{2}x^TQx + c^Tx \qquad \textrm{s.t.}~ \quad L \leq Ax \leq U; \quad l \leq x \leq u $$

where Q must be positive semi-definite and, if Q is zero, there may be a requirement that some of the variables take integer values. Thus HiGHS can solve linear programming (LP) problems, convex quadratic programming (QP) problems, and mixed integer programming (MIP) problems. It is mainly written in C++, but also has some C. It has been developed and tested on various Linux, MacOS and Windows installations. No third-party dependencies are required.

HiGHS has primal and dual revised simplex solvers, originally written by Qi Huangfu and further developed by Julian Hall. It also has an interior point solver for LP written by Lukas Schork, an active set solver for QP written by Michael Feldmeier, and a MIP solver written by Leona Gottwald. Other features have been added by Julian Hall and Ivet Galabova, who manages the software engineering of HiGHS and interfaces to C, C#, FORTRAN, Julia and Python.

Find out more about HiGHS at https://www.highs.dev.

Although HiGHS is freely available under the MIT license, we would be pleased to learn about users' experience and give advice via email sent to highsopt@gmail.com.

Documentation

Documentation is available at https://ergo-code.github.io/HiGHS/.

Installation

Build from source using CMake

HiGHS uses CMake as build system, and requires at least version 3.15. To generate build files in a new subdirectory called 'build', run:

    cmake -S . -B build
    cmake --build build

This installs the executable bin/highs and the library lib/highs.

To test whether the compilation was successful, change into the build directory and run

    ctest

More details on building with CMake can be found in HiGHS/cmake/README.md.

Build with Meson

As an alternative, HiGHS can be installed using the meson build interface:

meson setup bbdir -Dwith_tests=True
meson test -C bbdir

The meson build files are provided by the community and are not officially supported by the HiGHS development team.

Build with Nix

There is a nix flake that provides the highs binary:

nix run .

You can even run without installing anything, supposing you have installed nix:

nix run github:ERGO-Code/HiGHS

The nix flake also provides the python package:

nix build .#highspy
tree result/

And a devShell for testing it:

nix develop .#highspy
python
>>> import highspy
>>> highspy.Highs()

The nix build files are provided by the community and are not officially supported by the HiGHS development team.

Precompiled binaries

Precompiled static executables are available for a variety of platforms at https://github.com/JuliaBinaryWrappers/HiGHSstatic_jll.jl/releases

These binaries are provided by the Julia community and are not officially supported by the HiGHS development team. If you have trouble using these libraries, please open a GitHub issue and tag @odow in your question.

See https://ergo-code.github.io/HiGHS/stable/installation/#Precompiled-Binaries.

Running HiGHS

HiGHS can read MPS files and (CPLEX) LP files, and the following command solves the model in ml.mps

    highs ml.mps

Command line options

When HiGHS is run from the command line, some fundamental option values may be specified directly. Many more may be specified via a file. Formally, the usage is:

$ bin/highs --help
HiGHS options
Usage:
  bin/highs [OPTION...] [file]

      --model_file arg          File of model to solve.
      --read_solution_file arg  File of solution to read.
      --options_file arg        File containing HiGHS options.
      --presolve arg            Presolve: "choose" by default - "on"/"off"
                                are alternatives.
      --solver arg              Solver: "choose" by default - "simplex"/"ipm"
                                are alternatives.
      --parallel arg            Parallel solve: "choose" by default -
                                "on"/"off" are alternatives.
      --run_crossover arg       Run crossover: "on" by default -
                                "choose"/"off" are alternatives.
      --time_limit arg          Run time limit (seconds - double).
      --solution_file arg       File for writing out model solution.
      --write_model_file arg    File for writing out model.
      --random_seed arg         Seed to initialize random number generation.
      --ranging arg             Compute cost, bound, RHS and basic solution
                                ranging.
      --version                 Print version.
  -h, --help                    Print help.

For a full list of options, see the options page of the documentation website.

Interfaces

There are HiGHS interfaces for C, C#, FORTRAN, and Python in HiGHS/src/interfaces, with example driver files in HiGHS/examples/. More on language and modelling interfaces can be found at https://ergo-code.github.io/HiGHS/stable/interfaces/other/.

We are happy to give a reasonable level of support via email sent to highsopt@gmail.com.

Python

The python package highspy is a thin wrapper around HiGHS and is available on PyPi. It can be easily installed via pip by running

$ pip install highspy

Alternatively, highspy can be built from source. Download the HiGHS source code and run

pip install .

from the root directory.

The HiGHS C++ library no longer needs to be separately installed. The python package highspy depends on the numpy package and numpy will be installed as well, if it is not already present.

The installation can be tested using the small example HiGHS/examples/call_highs_from_python_highspy.py.

The Google Colab Example Notebook also demonstrates how to call highspy.

C

The C API is in HiGHS/src/interfaces/highs_c_api.h. It is included in the default build. For more details, check out the documentation website https://ergo-code.github.io/HiGHS/.

CSharp

The nuget package Highs.Native is on https://www.nuget.org, at https://www.nuget.org/packages/Highs.Native/.

It can be added to your C# project with dotnet

dotnet add package Highs.Native --version 1.8.1

The nuget package contains runtime libraries for

win-x64
win-x32
linux-x64
linux-arm64
macos-x64
macos-arm64

Details for building locally can be found in nuget/README.md.

Fortran

The Fortran API is in HiGHS/src/interfaces/highs_fortran_api.f90. It is not included in the default build. For more details, check out the documentation website https://ergo-code.github.io/HiGHS/.

Reference

If you use HiGHS in an academic context, please acknowledge this and cite the following article.

Parallelizing the dual revised simplex method Q. Huangfu and J. A. J. Hall Mathematical Programming Computation, 10 (1), 119-142, 2018. DOI: 10.1007/s12532-017-0130-5

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This version

1.8.1

Nov 13, 2024

1.8.0

Oct 18, 2024

1.7.2

Jul 1, 2024

1.7.1

Jun 11, 2024

1.7.1.dev1 pre-release

Mar 10, 2024

1.5.3

May 16, 2023

1.5.2

May 16, 2023

1.5.0.dev0 pre-release

Dec 15, 2022

1.4.0.dev0 pre-release

Nov 21, 2022

1.1.2.dev3 pre-release

Sep 4, 2022

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SHA256	`3568a39e8be211d9003f57598a9b898861a3bc33d2dcc78eb26e81ec3f135820`
MD5	`929367edcd18eddd252ebcbe911ba6ff`
BLAKE2b-256	`e41d94eab468b0bf22884721c8a2c1ce744874dc231860a26349396fe8a963d1`

Algorithm	Hash digest
SHA256	`e163c4985d4930bc04bd1dbe1830cee79b997c9f68172ad8ba5ebd326b716836`
MD5	`4e231d452ea9beeba7466b170e665bc1`
BLAKE2b-256	`3c486fe8a98e090e9b189b4f23ff28ca64cbc02c98e512260a6c86a9e8848f1c`

Algorithm	Hash digest
SHA256	`f97c9ed6f57764cfab988852ee880db4abdac634e3bf9c1148433729e62e3921`
MD5	`78caa392e6820040c807f4737a5db3e1`
BLAKE2b-256	`b956123604db74d412b9be23f1b9f9ad92c6fbb116aee74ecfe53030a45a5825`

Algorithm	Hash digest
SHA256	`0e6cf15ea7ffd07320b6ae1e84c341d96b3d9dceba19a39c635f95ec77b46d92`
MD5	`128f29054901a433697ccee710ee094c`
BLAKE2b-256	`40e98a1179d8679a759e42a1bb11c360580fbb654d3652d89b8a627cc4ef816a`

Algorithm	Hash digest
SHA256	`d99994d51a6fbfa36ee37170ba680df10c21c8ca11d5182b9b459833233a9f30`
MD5	`aec41714cecfb1ded00be6e0b6afc4aa`
BLAKE2b-256	`90f33c2b0baa90d3679a2d5562fe501a18e243c50a803b919b232b8b19f24c04`

Algorithm	Hash digest
SHA256	`2c9e7977e114b8fcf8ecaa3d6755c54d4878314eda0e90e60f8bbca1b6029170`
MD5	`9c4a44b9515b1f1557e33a3ec8828892`
BLAKE2b-256	`54d06440f7571c4810fda968bf13c26429546110460e4c64da1b6033b3c2f911`

Algorithm	Hash digest
SHA256	`4b8fc89555b4eea74d7974455e6b05fdb3356e1c4ae23c45c4083866ea01358e`
MD5	`204130633db73d5579afd4221b0a195b`
BLAKE2b-256	`d58346fc7af04fd73b0d3fbb81a16c59e0ac74a3276f50341c4005ac42e13883`

Algorithm	Hash digest
SHA256	`e8a618f386b6df598463e967a5c174cce073d6a805d5463aae849534d335ccad`
MD5	`9ad38c8b97573bb26bfd52035e34712b`
BLAKE2b-256	`a09e44a97a7825bfd7706d9e612333a392f3777be0d3a0ce681ce2b42f99c6c6`

highspy 1.8.1

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HiGHS - Linear optimization software

About HiGHS

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Build from source using CMake

Build with Meson

Build with Nix

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Algorithm	Hash digest
SHA256	`188b41cfde3c4b591a677d6a3bdebab31c005c691a7d7819d35803201b877829`
MD5	`874b5ef1dccb213963282441a263fee2`
BLAKE2b-256	`c55f83ddfe10ee288058ccb9b931b4ee413832b32b9a9a5205594116f4a1e519`

Algorithm	Hash digest
SHA256	`948249af5b2d233ce2bf11d25f376c30482b3b38252c259a1388ca1312f09aaa`
MD5	`ef46b1c0ca908141fb0cba5876349686`
BLAKE2b-256	`bba82fca1c24749ba8554dd666b6089a5949b41c7f2f5ec47543a464b0254888`

Algorithm	Hash digest
SHA256	`f84b37394b9d2c824d13e1917a609b3746c5fcc8bbaf8b021531a77b18b0d25e`
MD5	`58fe79595e6bd2e7f3eaecf31fe24f07`
BLAKE2b-256	`ad0343a846d90e6d97ad6fb8347873377c1dd5b194f8447b5ac691a96231086b`

Algorithm	Hash digest
SHA256	`2c8e7f229b7c12f7a157ee96c6a61159559c1aa4c69f46e7d90af4c9e3cf7713`
MD5	`abba1feabdaaa09db521e278205ada29`
BLAKE2b-256	`34b494e5b92d0f519a1f1d3d5c9dac17932ec8d5a57977cefe188c5243494c1e`

Algorithm	Hash digest
SHA256	`d40b926eed056891406d899492c257033536887a393ce43447fa247d227652bc`
MD5	`91c1fcb9f85c088c45679fb0f97b1c5c`
BLAKE2b-256	`1e035d39f57dd6cf56f63748737734cc8a1bcfc6852a054da24d329baea0220d`

Algorithm	Hash digest
SHA256	`ded960d78ea5c1d8aa6139d5b48e6d41b3797517efd9f0559d735e3ab4d0dc5b`
MD5	`b5e7c9990c2e5c3679a4a3307c15bf3a`
BLAKE2b-256	`ee3247adfa2ce8c79ea388cd97110fa2c3fdc15640510efbea90e4ba894318f9`

Algorithm	Hash digest
SHA256	`f4b5c33866ed85f4b3796cd43211a0e24ce2c26c7a11fc8934818d80cc544ccd`
MD5	`d5d462a0f060057f4e31977c11c3a80b`
BLAKE2b-256	`e88d60d103043988e4174fdb9d71243f37263967f65e13bbd20fa34fe47f282b`

Algorithm	Hash digest
SHA256	`774a026641cf7ebc87478adff33d0f451d95ce767d15f0ec4e7c4137b02b07ba`
MD5	`cbcfbf1f951ce5330ff6af52b1455f51`
BLAKE2b-256	`8dcf7e0e3f648bb320d679eb93b7f31fea13607fbf8f27ea92885d3eba6c0c8b`

Algorithm	Hash digest
SHA256	`121ceac7251c50659fd45fb78595ae16724ce65891ef5ba8d5881e6272f180d1`
MD5	`c029c8ac554774eb145e7a6fbf2c69a4`
BLAKE2b-256	`eefb88800b492c87cc7f6fea9cb5b5fccb8cb39e13164e4a0fd2ecf33ca2468e`

Algorithm	Hash digest
SHA256	`334f4a45a1ddb64ed29e0e3b9de6c1ecba6979a2d00877b2b0bba55b5212101f`
MD5	`cc03c102b419ad7d466ce6b8a9dee7be`
BLAKE2b-256	`dbbc1bbc710f6f4f6015fec404bd5879a5c00887dca25623fe386615b9f5aa4b`