fix: warn when CP-SAT returns a feasible but unproven-optimal partition at the time limit - #130
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…on at the time limit
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe change adds a CP-SAT warning for feasible results without proven optimality. It also expands partitioning tests for configurable settings and graph cycles, including cycle-safe grouping, repair, and backend-output validation. ChangesPartitioning validation
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🔵 Low · up to The PR correctly warns when partitioning stops with a feasible but unproven-optimal result, but the warning may display a rounded timeout for small configured values and therefore misstate the actual limit. The change is mergeable with explicit owner awareness or follow-up. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Inline comments:
In `@pr_split/logs.py`:
- Line 73: Update the CP-SAT timeout diagnostic format so the configured float
value is not rounded before logging; replace the fixed one-decimal formatting in
the timeout message with precision-preserving formatting while retaining the
existing message and timeout value.
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pr_split/logs.pypr_split/planner/partitioning.pytests/test_partitioning.py
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…warning
A float timeout below 0.1s rendered as '0.0s' under {timeout:.1f}, so the
warning that tells the user which limit to raise did not name the real
limit. Use {timeout:g}, and cover the sub-decisecond case; the existing
test used 0.5, which formats identically under both spellings.
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Summary
The CP-SAT partition backend accepted a
FEASIBLEsolver status silently. When the solver hits--cp-sat-timeouton a larger diff (the model has one boolean per unit×slot×pair, so ~70 units already exceed the default 15 s) it returns whatever feasible assignment it had — often dozens of singleton groups — and the user had no way to tell that from a proven-optimal plan.A
FEASIBLEresult now logs a warning:CP-SAT stopped at the 15.0s limit with a feasible but unproven-optimal plan (70 units, 37 groups); raise --cp-sat-timeout for a better partition.OPTIMALstays silent;INFEASIBLE/UNKNOWNstill raise as before.Test plan
test_feasible_but_not_optimal_is_warned(patchesCpSolver.Solveto report FEASIBLE after a real solve) andtest_optimal_solution_does_not_warn— both fail on mainSummary by CodeRabbit
Bug Fixes
Tests