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feat: Add relax() and unrelax() to Variable and Variables #634

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feat: Add relax() and unrelax() to Variable and Variables #634

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343e9ab
feat: Add relax() and unrelax() to Variable and Variables
FBumann Mar 25, 2026
7261823
chore: Rename test_fix.py to test_fix_relax.py and update release notes
FBumann Mar 25, 2026
79d7b3f
test: Add test that relaxing all variables converts MILP to LP
FBumann Mar 25, 2026
2c7d71e
fix notebook
FBumann Mar 25, 2026
6352385
chore: Strip notebook output metadata
FBumann Mar 25, 2026
a01fa05
fix: Address review feedback on relax/fix API
FBumann Mar 26, 2026
91f21c1
refactor: Simplify relax/unrelax with lookup pattern
FBumann Mar 26, 2026
48d3337
refactor: Return Variables containers from .fixed and .relaxed
FBumann Mar 26, 2026
47c0abf
test: Add tests for view chaining and double-relax idempotency
FBumann Mar 26, 2026
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3 changes: 2 additions & 1 deletion doc/release_notes.rst
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Expand Up @@ -24,7 +24,8 @@ Upcoming Version
* Improve handling of CPLEX solver quality attributes to ensure metrics such are extracted correctly when available.
* Fix Xpress IIS label mapping for masked constraints and add a regression test for matching infeasible coordinates.
* Enable quadratic problems with SCIP on windows.
* Add ``fix()``, ``unfix()``, and ``fixed`` to ``Variable`` and ``Variables`` for fixing variables to values via equality constraints. Supports automatic rounding and optional integrality relaxation (``relax=True``) for MILP dual extraction.
* Add ``fix()``, ``unfix()``, and ``fixed`` to ``Variable`` and ``Variables`` for fixing variables to values via equality constraints. Supports automatic rounding for integer/binary variables.
* Add ``relax()``, ``unrelax()``, and ``relaxed`` to ``Variable`` and ``Variables`` for LP relaxation of integer/binary variables. Supports partial relaxation via filtered views (e.g. ``m.variables.integers.relax()``). Semi-continuous variables raise ``NotImplementedError``.


Version 0.6.5
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