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CHANGELOG.rst

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Next Release

1.8.3

  • fix the objective offset test for compatibility with Debian sid

1.8.2

  • fix the feasibility check in the hybrid solver
  • make optlang compatible with numpy>=2.0

1.8.1

  • update versioneer to support newer Python versions

1.8.0

  • add a generic matrix interface to allow easy addition of new solvers that expect an immutable problem in standard form as input
  • replace the OSQP interface with a hybrid interface that uses HIGHS for (MI)LPs and OSQP for QPs
  • osqp_interface is now deprecated, will import the hybrid interface when used, and will be removed entirely soon

1.7.0

  • remove deprecated numpy type casts
  • The symbolics module now has consistent exports
  • When sympy is used the internal Symbol class now derives from sympy.core.Dummy. This circumvents the hack in place to make Symbols unique and makes optlang work with sympy>=1.12 again.
  • Updated the scipy and the jsonschema tests to work with newer versions of those packages.
  • Package version dependencies are now more specific.
  • Tests are run for sympy and symengine now.
  • Updated support Python versions to >=3.8.

1.6.1

  • fix the Gurobi version check to allow 10.0

1.6.0

  • fixes problem scaling for GLPK
  • fixes scaling output in GLPK that could not be turned off
  • Major performance improvements in the Gurobi interface when getting primals, shadow prices and reduced costs
  • Now only supports gurobipy>=9.5
  • Tests are now run with the Gurobi and CPLEX community editions
  • Drop support for Python 2 and add support for Python 3.10

1.5.2

  • Gurobi can now serialize its configuration correctly. This also fixes pickling of Gurobi models.
  • Fix the shim for integrality tolerance in OSQP which makes it easier to clone OSQP Models to other solvers.
  • Fix an issue where one could not rename variables in Gurobi version 9.

1.5.1

  • GLPK now respects Configuration.tolerances.integrality again

1.5.0

1.4.7

  • fix: except AttributeError when setting tolerance on cloned Configuration
  • enable cloning models between solver interfaces that do not support the same set of tolerance parameters