This release includes:

• Initial support for the HiGHS solver, a contribution from Robert Schwarz
• Initial support for Mac M1/M2/M3

What's Changed

• Add support for python 3.11 by @sebheger in https://github.com/coin-or/python-mip/pull/328

Full Changelog: https://github.com/coin-or/python-mip/compare/1.14.3...1.15.0

What's Changed

• fix #303 thread parameter setting using setter by @Sceriffo in https://github.com/coin-or/python-mip/pull/304
• Update os and python versions as well as pyproject.toml (#319) by @sebheger in https://github.com/coin-or/python-mip/pull/320
• Update install.rst by @kasperdokter in https://github.com/coin-or/python-mip/pull/315
• Add support for gurobi v10 (#316) by @sebheger in https://github.com/coin-or/python-mip/pull/321

New Contributors

• @Sceriffo made their first contribution in https://github.com/coin-or/python-mip/pull/304
• @kasperdokter made their first contribution in https://github.com/coin-or/python-mip/pull/315

Full Changelog: https://github.com/coin-or/python-mip/compare/1.14.1...1.14.2

What's Changed

• Introduce pyproject.toml by @sebheger in https://github.com/coin-or/python-mip/pull/283
• Fix for TypeError: can only concatenate str (not "type") to str by @Markus28 in https://github.com/coin-or/python-mip/pull/288
• Pin pypy version for CI by @sebheger in https://github.com/coin-or/python-mip/pull/295
• Update macos version in CI by @sebheger in https://github.com/coin-or/python-mip/pull/298
• Added pre-commit by @Markus28 in https://github.com/coin-or/python-mip/pull/293
• Fix Gurobi objective by @Markus28 in https://github.com/coin-or/python-mip/pull/290
• Fix removal of variables (#294) by @sebheger in https://github.com/coin-or/python-mip/pull/296
• Update version of numpy by @sebheger in https://github.com/coin-or/python-mip/pull/301
• Remove and untrack mip/_version.py to make setuptools_scm work correctly by @sebheger in https://github.com/coin-or/python-mip/pull/302

New Contributors

• @Markus28 made their first contribution in https://github.com/coin-or/python-mip/pull/288

Full Changelog: https://github.com/coin-or/python-mip/compare/1.14.0...1.14.1

What's Changed

• Fix typo in quickstart by @dzhou343 in https://github.com/coin-or/python-mip/pull/177
• Fix line numbers on 0/1 Knapsack Problem example. by @Silventino in https://github.com/coin-or/python-mip/pull/212
• Remove repetition in docs by @fortierq in https://github.com/coin-or/python-mip/pull/232
• Fix broken link in docs by @fortierq in https://github.com/coin-or/python-mip/pull/231
• Make black happy again by @sebheger in https://github.com/coin-or/python-mip/pull/259
• fix: handle objective constant with gurobi by @peterlietz in https://github.com/coin-or/python-mip/pull/214
• Add some more tests and fix a rare case at failed optimization of unbounded model by @sebheger in https://github.com/coin-or/python-mip/pull/241
• Make black happy again by @sebheger in https://github.com/coin-or/python-mip/pull/261
• Update arithmetic of VAR entity and fixes attribute query by @sebheger in https://github.com/coin-or/python-mip/pull/244
• Fix missing starts by @aphi in https://github.com/coin-or/python-mip/pull/242
• Update CI for windows by @sebheger in https://github.com/coin-or/python-mip/pull/265
• LinExpr update and added tests by @sebheger in https://github.com/coin-or/python-mip/pull/264
• Add support for gurobi installed via gurobipy from pip (#185) by @sebheger in https://github.com/coin-or/python-mip/pull/271
• fixed closing bracket typo by @brmanuel in https://github.com/coin-or/python-mip/pull/243
• Reactivate all os / python version combinations in CI by @sebheger in https://github.com/coin-or/python-mip/pull/278

New Contributors

• @dzhou343 made their first contribution in https://github.com/coin-or/python-mip/pull/177
• @Silventino made their first contribution in https://github.com/coin-or/python-mip/pull/212
• @fortierq made their first contribution in https://github.com/coin-or/python-mip/pull/232
• @sebheger made their first contribution in https://github.com/coin-or/python-mip/pull/259
• @peterlietz made their first contribution in https://github.com/coin-or/python-mip/pull/214
• @aphi made their first contribution in https://github.com/coin-or/python-mip/pull/242
• @brmanuel made their first contribution in https://github.com/coin-or/python-mip/pull/243

Full Changelog: https://github.com/coin-or/python-mip/compare/1.13.0...1.14.0

Mostly a bugfix release, all users are encourage to update:

• updated CBC binaries; seems to fix some longstanding bugs in MacOS
• documentation fixes
• fix gurobi detection
• fix query of LinExpr.violation when no solution is available

• ability to read and write LP optimal basis files (.bas extension)
• speedup gurobi initialization, thanks @jurasofish
• fix for querying column contents in callbacks, thanks @rodoufu
• fix for mip gap, thanks @nick-gorman
• fix for cbc in dense conflict graphs

Python-MIP 1.11.0

• Two additional parameters, three depth and pass number, are now informed to the generage_constrs method in ConstrsGenerator class (which is used for cut/lazy constraints callbacks). Thus, strategies that generate more/less cuts at a given depth can use this information. See here .

• Cut generators: additional cut generators can now be called at the root node in customized cutting planes algorithms, see here .

• Instance features: it is now possible to query a vector of instance features. These features can be used in machine learning algorithms, for example, to decide the best parameter settings. Basic features are just the problems dimensions, e.g.: columns, rows, non-zeros. The current implementation extracts 208 instance features. To see an implementation of algorithm selection that is used in the COIN-OR Linear Programming Solver (CLP) check: Vilas Boas, M.G., Santos, H.G., Merschmann, L.H.C. and Vanden Berghe, G. Optimal Decision Trees for the Algorithm Selection Problem: Integer Programming Based Approaches. International Transactions in Operational Research, DOI 10.1111/itor.12724. 2019.

This release release adds a new model method: clique_merge, which merges constraints of conflicting variables (usually set packing) to produce a more compact and stronger formulation.

Two new stopping criteria were added: max nodes/seconds without improving the incumbent solution.

We also added more tests and fixed some bugs in the Cbc C Interface.

• fix for loading MIPStart from a file
• test for support for .gz and .bz2
• remove mutable default arguments #93
• tests now in github actions