SAHI Files

A patch release with one performance fix. NMM postprocessing no longer slows down as its merge groups grow, which is the shape crowded scenes produce.

⚡ Performance

• NMM stops rescanning merge lists it has already filled (https://github.com/obss/sahi/pull/1422). Every candidate box was first searched for in the Python list of boxes already merged into the current keeper, and only then checked against the merge_to_keep array. That search costs one step per box already in the group, so a crowded scene, which ends up with a few very large groups, paid it on almost every candidate. A box is appended to a merge list and recorded in merge_to_keep in the same step, so the array lookup on its own already answers the question and the list search only repeated it. Removing it leaves every group exactly as it was and turns the merge bookkeeping from quadratic in the size of a group into linear. The dense, stored-pair and streaming paths share this bookkeeping, so all three improve, and the numba backend inherits the change through the dense one.

NMM on a crowded layout, IOS / 0.3:

📚 Documentation

• The Chinese documentation now covers 0.12.5 (https://github.com/obss/sahi/pull/1423).

Full Changelog: https://github.com/obss/sahi/compare/0.12.5...0.12.6