OMMX Python SDK 2.7.x

Version 2.7.0 includes an MPS parsing correction that can change the mathematical model loaded from the same file, including its feasible set. Review affected models and previous solver results when upgrading.

The 2.7.0 solver adapter packages require OMMX 2.7.0 or later in the v2 line.

Bug Fixes

Load the regenerated MIPLIB distribution (#1204)

ommx.dataset.miplib2017() now reads from ghcr.io/jij-inc/ommx/v2.7/miplib2017:{name}, regenerated from the source MPS files with the corrected v2 parser. The Rust MIPLIB loader uses the same distribution. Existing caches under the old, unversioned repository do not override these corrected instances.

Published references are fixed, and patch releases retain the same distribution. Changes to the distribution format or mathematical model require a minor or major release and a new versioned repository. See the MIPLIB tutorial for the download path.

Preserve implicit binary bounds when loading MPS (#1203)

Instance.load_mps() and ommx.mps.load_file() now give columns inside INTORG/INTEND with no BOUNDS entry the implicit binary domain [0, 1], following the Gurobi/HiGHS MPS convention. Previously, these columns became general integers with an infinite upper bound. This affected 17 variables in neos-2626858-aoos, changing its binary-variable count from 209 to 192.

Explicit bound records remain effective, including LO/LI 0 for nonnegative integers with no upper limit. The parser correction does not rewrite stored Artifacts; the distribution change above supplies regenerated instances through ommx.dataset.miplib2017().