| --- |
| tags: |
| - smart-manufacturing |
| - sft |
| - industrial |
| - vision |
| license: other |
| pretty_name: "186-mcq" |
| extra_gated_fields: |
| Name: text |
| Affiliation: text |
| Intended use: text |
| extra_gated_prompt: >- |
| This dataset is released for **research use**. Access is reviewed and granted |
| **manually** by the maintainers. Please state your name, affiliation, and intended use. |
| --- |
| |
| # 186-mcq |
|
|
| Mask-grounded multiple choice (Set-of-Mark style) for magnetic-tile defect localization — |
| **244 items**, derived **deterministically** from the pixel saliency masks of |
| [`AI4Manufacturing/186`](https://huggingface.co/datasets/AI4Manufacturing/186). Exact-match gradable |
| → SFT and RLVR-ready. |
|
|
| ## Task |
|
|
| One item per eligible defective record. The `image` is a 2×2 grid of views **A–D** of the *same* |
| tile photo; each view overlays **one red candidate region mask** (SoM style: translucent fill + |
| outline + corner letter). Exactly one view overlays the true defect mask — in both location and |
| extent (the query says so). `annot` is the correct letter. The three negatives per item are hard by |
| construction, drawn from: `shift` (translated by ~0.7–1.6× bbox extents), `fliplr`/`flipud`/`rot180` |
| (mirrored), `dilate` (over-grown ≥2.5×, bounded), `erode` (shrunk <60%). This dataset has ONE defect |
| type per image, so there is no `othertype` negative. Every negative is guaranteed wrong (IoU vs truth |
| < 0.35 except `dilate`, wrong by extent) and panels are mutually distinct (pairwise IoU < 0.7). |
| Negative kinds are assigned to slots by an independent salted hash (arrangement encodes nothing). |
|
|
| Gold letters: A 53 / B 61 / C 58 / D 72 (chi² = 3.18, at chance). Query pool: 16 variants. |
|
|
| **Exclusions (counted, confidence-over-coverage): 148 of 392 defective records were skipped** — |
| gold overlay under ~30 visible px after panel downscale (37, mostly the smallest Blowholes), fewer |
| than 3 sound visible negatives constructible (77), mask covering >35% of the frame (30, large |
| Uneven/Fray — no sane negatives), source empty-mask Uneven rows (4). Per-type coverage of the 244 |
| shipped items: Blowhole 100, Break 55, Crack 56, Uneven 20, Fray 13. The skipped defects remain |
| fully covered by the companion `186-grounding` / `186-region` sets. |
|
|
| | field | type | meaning | |
| |---|---|---| |
| | `query` | str | 16 variants; names the defect type to locate; "answer with the letter only" | |
| | `image` | Image | 2×2 composite, panels A–D | |
| | `annot` | str | `A` / `B` / `C` / `D` | |
| | `reasoning` | null | none — deterministic derivation | |
| | `cate` / `task` | str | `B` / `T-B2` | |
| | `metadata` | str (JSON) | source, category, `image_sha256`, `image_path`, `r186_record_id`, `defect_type`, `gold_letter`, `panel_tags`, `area_pct` | |
|
|
| ## Roles |
|
|
| **Roles:** this is an answer-only tier — there is no reasoning column; `annot` is both the machine-parseable gold AND the direct-answer SFT target ('SFT-ready' here means direct imitation of `annot` in the query-specified format); it is also the exact-match/IoU reward key for RLVR. |
|
|
| ## Provenance |
|
|
| Built **deterministically (no LLM/teacher; `reasoning` is null)** from |
| [`AI4Manufacturing/186`](https://huggingface.co/datasets/AI4Manufacturing/186) (revision `2117f8e`) — |
| Magnetic-Tile-Defect, Huang et al., *"Surface defect saliency of magnetic tile"*, The Visual Computer 2020: |
| 1,344 grayscale magnetic-tile images, 5 defect classes (Blowhole, Break, Crack, Fray, Uneven) + good, |
| each defective image with a paired pixel saliency mask (binarized here at gray>40, which matches the |
| source `defect_area_fraction`). Generator: `annotate/186/build_186_derived.py` in `forge_model`; |
| machine gates: `annotate/186/verify_186.py` (all green at build time). |
|
|
| **Source-data exclusion (counted):** 4 `MT_Uneven` rows ship ALL-ZERO masks in the source dataset |
| (`defect_area_fraction = 0.0`) — an anomalous label with no localizable GT. They are excluded from |
| every derived set. |
|
|
| **Query diversity.** The `query` field is drawn from a fixed pool of surface variants for this task |
| (paraphrases preserving the task and answer format), selected by an independent per-record hash. |
| A machine gate checks that no template correlates with the gold (worst z-scores reported above). |
|
|
| > The repository name is an internal task code (the source dataset's code is `186`). |
|
|
