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feat: add XpressSolver; fix HighsSolver threads - #788
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Adds fx.solvers.XpressSolver, mapping mip_gap, time_limit_seconds and log_to_console to the Xpress controls MIPRELSTOP, TIMELIMIT and OUTPUTLOG. Linopy already supports Xpress, so this only adds the flixopt-side configuration. Tests run against Xpress when the xpress package is installed, and the docs cover installation. Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01QZ8AnG2jhX3n9Q2s2inYPm
… to XpressSolver HighsSolver declared a threads field, but the subclass was not a dataclass, so HighsSolver(threads=4) raised a TypeError. All solver subclasses are now dataclasses. XpressSolver gains threads, mapped to the Xpress THREADS control. threads comes after the base fields, so positional calls like HighsSolver(0.01, 60) are unchanged. Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01QZ8AnG2jhX3n9Q2s2inYPm
Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01QZ8AnG2jhX3n9Q2s2inYPm
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Merge Risk: 🔵 Low · up to
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 8.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 12 functions across 3 files. (2 skipped: 2… | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Title check The title clearly and concisely identifies both main changes: adding XpressSolver and fixing HighsSolver thread support. Description check The description is complete and follows the repository template. It explains the changes, identifies the change types, states that no related issue exists, documents testing, and confirms the checklis… Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request. Full details: Description check
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Explanation
The description is complete and follows the repository template. It explains the changes, identifies the change types, states that no related issue exists, documents testing, and confirms the checklist items.
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Full details: Docstring Coverage
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Explanation
Docstring coverage is 8.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 12 functions across 3 files. (2 skipped: 2 unsupported.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Actionable comments posted: 1
- 🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @docs/home/installation.md:
- Line 53: Update the Xpress Community license wording to state that the
5,000-row-and-column limit applies to their combined total, not 5,000 of each.
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docs/home/installation.mddocs/user-guide/optimization/index.mdflixopt/solvers.pytests/conftest.pytests/utilities/test_solvers.py
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…ined Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01QZ8AnG2jhX3n9Q2s2inYPm
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Description
Adds
fx.solvers.XpressSolverso flixopt models can be solved with FICO Xpress. It also fixesHighsSolver(threads=...), which previously raised aTypeError.linopy already supports Xpress and passes the options dict unchanged to
xpress.problem.setControl(), so the flixopt side only maps option names:mip_gapMIPRELSTOPtime_limit_secondsTIMELIMITlog_to_consoleOUTPUTLOG(0/1)threadsTHREADS(omitted whenNone)Other Xpress controls go through
extra_options.HighsSolver
threadsfix: the solver subclasses were not@dataclass, soHighsSolver'sthreadsfield never became part of__init__, andHighsSolver(threads=4)raisedTypeError. All subclasses are now dataclasses. Becausethreadsis appended after the base fields, positional calls such asHighsSolver(0.01, 60)behave as before.Xpress control names checked, given linopy's past Xpress issues:
getControl. Xpress raises on unknown names, so a wrong name fails loudly instead of being ignored.TIMELIMITvs.MAXTIME:TIMELIMITreplaces the deprecatedMAXTIMEand requires Xpress ≥ 9.0.linopy >= 0.5.1, so this is documented rather than enforced.terminated_by_limit, via bothio_api='lp'and'direct'. This was run withDeprecationWarningas error, so no deprecated Xpress calls are made. A largermip_gapcorrectly stops the solve early.Notes:
xpressis not added to thefull/devextras (it's a large package), so users install it withpip install xpress, and CI skips the Xpress test parametrization. Happy to add it todevif you want CI coverage.log_to_console=False, Xpress still prints a few "Reading Problem" lines, because linopy applies controls only after loading the problem.Type of Change
Related Issues
None.
Testing
solver_fixtureintests/conftest.pynow includes Xpress (skipped whenxpressisn't installed).tests/utilities/test_solvers.pycoversthreads, positional args and the Xpress option mapping.ruff check/ruff format --checkare clean on the changed files.Checklist
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