# Changelog

Each release is a git tag on this repository; load a specific one with `revision="<tag>"` in `datasets.load_dataset`.

Versioning follows these rules:

- Patch (v2.0.x): corrections to existing content (reference answers, source files, removal of duplicate or defective questions), even when corrected answers fall on the test side of the frozen split; surviving `id` values and split assignments never change.
- Minor (v2.x.0): added projects, models or questions.
- Major (vX.0.0): changes to the schema, the `id` scheme or the evaluation split.

The checksum of each release's `questions/ifc-bench-v2.csv` is listed in the README at that tag.

## Unreleased

- wbdg_office: replaced the `license.txt` copied by mistake from dental_clinic with the original buildingSMART alliance reuse terms of the Common BIM Files, and relabelled the model card and README entry from CC BY 4.0 to those terms.
- ac20, fzk_house, smiley_west: replaced the CC BY 4.0 `license.txt` with the KIT "unrestricted use" terms and source line published on the KIT IFC Examples page, and relabelled the README entries to match the model cards.

## v2.0.3 (2026-10-07)

- Corrected the reference answers of 69 questions and the encoding of one question text (Q269); no `id` or split assignment changed (#12, discussion #9).
- Repaired the remaining Mac Roman mojibake (e.g. `TÖºr` to `Tür`) in 54 answers across 9 projects.
- fzk_house: labelled net and gross areas in Q512 and Q541, unified area units to m², aligned the structural element count in Q508 with Q544 (50), fixed the double-counted walls in Q554 (82 elements), moved the HANDRAIL type to the railing occurrences in Q539, and dropped details the questions do not ask for in Q513, Q536 and Q547.
- smiley_west: fixed the Kalksandstein 175 layer thickness in Q917 (0.175 m).
- fantasy_hotel_1: removed the wrong total in Q356.
- 37 of the changed questions belong to the test side of the frozen split, 7 of them with content changes (512, 513, 536, 541, 547, 554, 917); test scores on v2.0.3 are not directly comparable with earlier releases.

## v2.0.2 (2026-10-01)

- Corrected the reference answers of 61 questions; no question text, `id` or split assignment changed.
- Restored the corrupted Molio IFC source (`projects/molio/arc.ifc`) and corrected the 33 dependent Molio answers (#8).
- Corrected unsupported answers and definitions across 4351, dental_clinic, digital_hub, hitos, schependomlaan, sixty5 and wbdg_office (#7, #8).
- fzk_house: fixed the window width extremes in Q519 and Q520 (#3), dropped two unreproducible element counts (issue #5), labelled gross and net floor areas and fixed coordinates, railing type and text encoding (#10, discussion #9).
- smiley_west: fixed the 2.OG spaces, wall type counts, a wall layer thickness, a missing slab type and text encoding (#11).
- 21 of the changed questions belong to the test side of the frozen split, so test scores on v2.0.2 are not directly comparable with v2.0.1 or with Hellin et al. 2026.

## v2.0.1 (2026-07-01)

- Removed the train-side copy of a question duplicated across the frozen split (former `id` 21); see [Deduplication note](../README.md#deduplication-note-v2-update).

## v2.0-frozen-split (2026-07-01)

- Added the seven West Riverside Hospital models (without QA pairs) and corrected one answer.
- Added the stable `id` column and the frozen 514-question evaluation split used in Hellin et al. 2026; snapshot taken before deduplication.

## v2.0.0 (2026-02-05)

- First v2 release: 21 projects, 37 BIM models, 1027 QA pairs, with licensing updated to flag the GPL-3.0 models.