python: Provide incumbent solution in callback #1882
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I updated the commit to fix the formatting issue and made a small edit to examples/call_highs_from_python.py |
mathgeekcoder
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Sep 16, 2024
Major highspy update: * changed `highs_linear_expression` to be immutable by default * improved callback support * improved test coverage (99%) * performance and usability enhancements * Support `__iadd__`, `__imul__`, etc. * Updated chain comparison support in immutable setting * `h.val()` can take `highs_linear_expression` * `expr == [lb,ub]` -> `lb <= expr <= ub` syntax * `qsum` * added pretty print `__repr__` and `__str__` * added KeyboardInterrupt support * added user interrupt * fixed slicing issues with numpy and highs * added `resetGlobalScheduler` * released GIL for `Presolve` * fixed issues with deadlock on Windows * fixed MIP solution callback issue * support `getExpr` that creates a `highs_linear_expression` from existing row Should address multiple issues: ERGO-Code#1865, ERGO-Code#1882, ERGO-Code#1888, ERGO-Code#1892, ERGO-Code#1903, ERGO-Code#1904, and perhaps ERGO-Code#1905
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An accessor for the incumbent solution was already present in the callback data in highspy. But as pointed out in #1856 it was not properly implemented. This PR fixes that.