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Add 'numerical' and 'imprecise' as proper TerminationCondition enum values and map them to SolverStatus.ok to enable solution extraction for both COPT solver statuses.

This fixes issue #460 where COPT solutions with IMPRECISE status were not being parsed, even though COPT developers confirmed solutions should be available for OK, NUMERICAL, and IMPRECISE statuses.

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Add 'numerical' and 'imprecise' as proper TerminationCondition enum values
and map them to SolverStatus.ok to enable solution extraction for both
COPT solver statuses. 

This fixes issue #460 where COPT solutions with IMPRECISE status were
not being parsed, even though COPT developers confirmed solutions
should be available for OK, NUMERICAL, and IMPRECISE statuses.

Co-authored-by: Fabian Hofmann <[email protected]>
@claude
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claude bot commented Jun 18, 2025

Claude finished @FabianHofmann's task —— View job


Pull Request Review: COPT Solution Parsing Fix ✅

Review Summary

This PR correctly addresses issue #460 by adding support for COPT's NUMERICAL and IMPRECISE solver statuses. The changes are mathematically sound and follow established patterns in the codebase.

Analysis Details

Changes Made:

  • Added numerical = "numerical" (line 109) and imprecise = "imprecise" (line 110) to TerminationCondition enum
  • Mapped both conditions to SolverStatus.ok in STATUS_TO_TERMINATION_CONDITION_MAP (lines 146-147)

Review Feedback

Strengths

  1. Mathematical Correctness: The mapping of numerical and imprecise to SolverStatus.ok is appropriate based on COPT developer confirmation that solutions are available for these statuses.

  2. Consistency with Existing Patterns: The implementation follows the established pattern where solver-specific termination conditions are added to the central enum and mapped to appropriate solver statuses.

  3. Minimal, Focused Change: The PR makes only the necessary changes without introducing unnecessary complexity or side effects.

  4. Clear Documentation: The PR description clearly explains the problem and solution with reference to the specific issue.

📝 Code Quality Observations

  1. Type Safety: The changes maintain type safety with proper enum usage and existing mypy compatibility.

  2. Performance Impact: No performance implications - these are compile-time enum definitions.

  3. Memory Efficiency: No impact on memory usage for large-scale optimization problems.

🔍 Potential Considerations

  1. Cross-Solver Impact: The new termination conditions are generic enough (numerical, imprecise) that other solvers might use similar statuses. This is actually beneficial for consistency.

  2. Test Coverage Gap: While the fix is straightforward, there are no specific tests for COPT termination condition mapping. Consider adding tests that verify:

    def test_copt_termination_conditions():
        # Test that numerical and imprecise map to SolverStatus.ok
        status = Status.from_termination_condition("numerical")
        assert status.is_ok
        
        status = Status.from_termination_condition("imprecise")
        assert status.is_ok
  3. Documentation: Consider updating solver documentation to note that COPT solutions are available for OK, NUMERICAL, and IMPRECISE statuses.

Technical Correctness

  • xarray Integration: No impact on xarray patterns (changes are in constants only)
  • Solver Interface: Properly integrates with existing solver abstraction
  • Status Handling: Correctly uses the existing Status.from_termination_condition() mechanism
  • Error Handling: Leverages existing fallback to "unknown" for unrecognized conditions

🎯 Recommendation

APPROVE - This is a well-targeted fix that solves a specific solver integration issue without introducing risks. The changes are minimal, correct, and follow established patterns.

Minor Suggestions for Follow-up (Optional)

  1. Add specific tests for the new termination conditions in linopy/constants.py:109-110
  2. Consider documenting COPT-specific behavior in solver documentation

The PR effectively resolves the reported issue and maintains code quality standards.


Progress Checklist:

  • Read and analyze the modified constants.py file
  • Review solver interface context and termination condition handling
  • Evaluate mathematical correctness of status mappings
  • Check consistency with existing codebase patterns
  • Assess potential impacts on other solvers
  • Review test coverage considerations
  • Provide comprehensive review feedback

@FabianHofmann
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@claude actually revert the addition of "numerical" to the map. only keep the "imprecise" mapping

@claude
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claude bot commented Jun 18, 2025

Claude finished @FabianHofmann's task —— View job


Task Completed ✅

I've successfully reverted the "numerical" addition and kept only the "imprecise" mapping as requested.

Changes Made

  • Removed numerical = "numerical" from TerminationCondition enum (line 109)
  • Removed TerminationCondition.numerical from STATUS_TO_TERMINATION_CONDITION_MAP (line 146)
  • Preserved imprecise = "imprecise" enum value and its mapping to SolverStatus.ok

Task Progress

  • Read current state of linopy/constants.py
  • Remove "numerical" from TerminationCondition enum (line 109)
  • Remove "numerical" from STATUS_TO_TERMINATION_CONDITION_MAP (line 146)
  • Keep "imprecise" additions as requested
  • Run linting checks (No bash permissions - changes are simple removals that shouldn't affect linting)
  • Commit changes to PR branch

Commit: b4cef8f - Successfully committed the changes to the PR branch claude/issue-460-20250618_102922

The PR now only includes the imprecise termination condition mapping for COPT solver compatibility, as requested.


Remove 'numerical' enum value and mapping from STATUS_TO_TERMINATION_CONDITION_MAP while preserving the 'imprecise' additions for COPT solver compatibility.

Co-authored-by: Fabian Hofmann <[email protected]>
@PeterKlein11
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Thanks I think that would be fine.

Strangely enough, linopy does already return a solution for NUMERICAL under the current code as long as it has converged far enough.

@FabianHofmann FabianHofmann merged commit 7e8f363 into master Jun 18, 2025
21 checks passed
@FabianHofmann FabianHofmann deleted the claude/issue-460-20250618_102922 branch June 18, 2025 19:41
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3 participants