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- Improved Hungarian matching performance by using a compact detection cost matrix that scales with per-image target counts while preserving assignment behavior and falling back to the full path for unsafe or incompatible inputs - Improved matcher validation for target dtype/device mismatches, out-of-range labels, non-finite relevant costs, extreme coordinates, grouped-query constraints, and float64 inputs while preserving established full-path behavior - Refactored focal classification cost calculation so compact and full Hungarian matching paths share the same formula - Fixed concurrent COCO dataset downloads by serializing access per asset, using process-unique staging files, retrying truncated archives, cleaning up partial downloads, and avoiding redundant downloads after another process completes extraction --------- Co-authored-by: Jesús Royeth <JESUSROYETH@users.noreply.github.com> Co-authored-by: Jirka Borovec <6035284+Borda@users.noreply.github.com> Co-authored-by: claude[bot] <209825114+claude[bot]@users.noreply.github.com>