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This PR adds support for using [PSLP](https://github.com/dance858/PSLP) presolver for LPs. The PSLP presolver is enabled by default for LPs. This can be changed to off (--presolve 0) or switch to papilo (--presolve 1). This PR also fixes a bug and improves performance of the folding. Bug fix: Coloring scheme was resulting in AX != YA because of incorrect optimization step. This is now fixed. Performance improvement: Replaced std::unordered_map with std::map. The unordered map required computing hash values on floating point numbers which is very slow. With this improvement dlr1 model can be folded in 6 seconds compared 30 seconds before. dlr2 can be folded now in 30 seconds. ## Issue Authors: - Rajesh Gandham (https://github.com/rg20) - Chris Maes (https://github.com/chris-maes) Approvers: - Ramakrishnap (https://github.com/rgsl888prabhu) - Chris Maes (https://github.com/chris-maes) URL: #816
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FAILURE - Unable to forward-merge due to an error, manual merge is necessary. Do not use the IMPORTANT: When merging this PR, do not use the auto-merger (i.e. the |
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Forward-merge triggered by push to release/26.02 that creates a PR to keep main up-to-date. If this PR is unable to be immediately merged due to conflicts, it will remain open for the team to manually merge. See forward-merger docs for more info.